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The POSCO Quality

Hot Rolled Steel

Hot rolled steel products are divided into two groups: hot rolled coils produced through hot rolling and hot rolled steel plates, which are made by cutting material from hot rolled coils. Slabs produced from a continuous casting system are rolled, cooled and coiled into the sizes required by the customers.

POSCO has six hot rolling plants and one high mill plant in Pohang and Gwangyang that produce 9.8 million tons of hot rolled products each year, garnering a global reach. Hot rolled products are used extensively for various applications including machines, architectural structures, car structures, general/API steel pipes and cold rolling.

Steel for Cold Rolled Steel

This product is typically used for cold rolling and among the hot rolled products has the lowest strength. It has wide applications ranging from regular machining to drawing and ironing. It is also used in a variety of cold rolled products including CR, GI, EG and color plates.

Key Specifications

?
  • POSCOPOSCO Standards
  • KSKorean Industrial Standards
  • JISJapanese Industrial Standards
  • ENEuropean Standards
  • DINDentsches Institut fur Normung
  • BSBritish Standards
  • ASTMAmerican Society for Testing and Materials
  • SAESociety of Automotive Engineers
  • APIAmerican Petroleum Institute
닫기
  • - POSCO : POSHRD2, POSHRD3
  • - JIS : SPHC/D/E
  • - SAE : SAE1006-1020

Mild Steel

Mild Steel has a low carbon content and is relatively soft, having a tensile strength of no greater than 340 MPa. Its good elongation and great formability make the steel popular for many applications ranging from regular to sophisticated machining. Its most common application is automotive parts

Key Specifications

?
  • POSCOPOSCO Standards
  • KSKorean Industrial Standards
  • JISJapanese Industrial Standards
  • ENEuropean Standards
  • DINDentsches Institut fur Normung
  • BSBritish Standards
  • ASTMAmerican Society for Testing and Materials
  • SAESociety of Automotive Engineers
  • APIAmerican Petroleum Institute
닫기
  • - POSCO : SPHC/SPHD/SPHE
  • - JIS : SPHC/SPHD/SPHE
  • - EN : DD11/12/13/14
Related Industries
Automotive Chassis
Hot Rolled Grade C

Hot rolled CQ (commercial quality) mild steel contains a low level of carbon (0.13-0.2%), with a tensile strength of over 270 MPa. It is extensively used for auto chassis parts having a thickness of over 1.2 mm. Products include HR, PO, HGI and HGA.

Applications

Commercial quality automotive members and chassis parts

Mechanical Properties
기계적성질의 세부 스펙
Guaranteed
Value
Class 0.2%YS, MPa
Spec.
TS, MPa
Spec.
El., %
Spec.
TS PO 111~ 270~550 29~
Coating Information
Uncoated, Electrogalvanized, Galvanized, Galvannealed 의 Commercial products, Customer trial 구분 표시
Uncoated Electrogalvanized Galvanized Galvannealed
Commercial products - Commercial products Commercial products
Commercial products Commercial products Customer trial Customer trial
Hot Rolled Grade D

Hot rolled DQ (drawing quality) mild steel contains a low level of carbon (0.13-0.2%), with a tensile strength of over 270 MPa and elongation of over 33%. It is extensively used for auto chassis parts having a thickness of over 1.2 mm. Products include HR, PO, HGI and HGA.

Applications

Automotive members and chassis parts that require high workability

Mechanical Properties
Mechanical Properties
Guaranteed
Value
Class 0.2%YS, MPa
Spec.
TS, MPa
Spec.
El., %
Spec.
TS PO 111~ 270~ 33~
Coating Information
Uncoated, Electrogalvanized, Galvanized, Galvannealed 의 Commercial products, Customer trial 구분 표시
Uncoated Electrogalvanized Galvanized Galvannealed
Commercial products - Commercial products Customer trial
Commercial products Commercial products Customer trial Customer trial
Hot Rolled Grade E

Hot rolled DDQ (deep drawing quality) mild steel contains a very low level of carbon (0.03-0.12%), thus is ideal for applications that require higher workability than grade D hot rolled steel. Its tensile strength is over 270 MPa, and its elongation is over 35%. It is used extensively for auto parts having a thickness of over 1.2 mm that require drawing. Products include HR, PO, HGI and HGA.

Applications

Automotive members and chassis parts that require higher workability than grade D hot rolled steel

Mechanical Properties
기계적성질의 세부 스펙
Guaranteed
Value
Class 0.2%YS, MPa
Spec.
TS, MPa
Spec.
El., %
Spec.
TS PO 111~ 270~ 36~
Coating Information
Uncoated, Electrogalvanized, Galvanized, Galvannealed 의 Commercial products, Customer trial 구분 표시
Uncoated Electrogalvanized Galvanized Galvannealed
Commercial products - - -
Commercial products Commercial products Customer trial Customer trial

High Strength Steel

High Strength Steel is made by adding silicon, manganese, nickel, chromium, copper and other elements to carbon steel containing 0.2 percent of carbon for higher performance. With a tensile strength of about 50 kg/mm2, this steel features a reasonable level of strength and toughness. High Strength Steel can be classified into bake-hardening steel, solid-solution strengthening and precipitation hardening steel. It also has many variants: BH (Bake-Hardenable) steel, HSLA (high strength low alloy), R (rephosphorized) steel, IF (Interstitial Free) HSS and ATOS (AuTOmobile Structural) steel.

Key Specifications

?
  • POSCOPOSCO Standards
  • KSKorean Industrial Standards
  • JISJapanese Industrial Standards
  • ENEuropean Standards
  • DINDentsches Institut fur Normung
  • BSBritish Standards
  • ASTMAmerican Society for Testing and Materials
  • SAESociety of Automotive Engineers
  • APIAmerican Petroleum Institute
닫기
  • - POSCO : ATOS540/580/780/980, A715-40/45/50/55/60/65/70/80
  • - JIS : SAPH310/370/440/440, SPFH540/590
  • - ASTM : A715-40/45/50/55/60/65/70/80
Related Industries
Automotive Chassis

What is HSLA (High Strength Low Alloy) Steel?

High strength low alloy (HSLA) is made by adding precipitation enhancing elements (i.e., Ti, Nb) to low carbon steel to disperse carbonized precipitation into fine grains. Common elements contained in the precipitation that are created during this process include NbC, TiC, VC and AIN. These elements interrupt dislocation motion, improving strength and impact toughness. The smaller the precipitation, the higher the strength becomes. Affordability coupled with high strength makes the steel popular as reinforcement for impact toughness in motor vehicles.

A715-40

Hot rolled A715-40 is compliant with ASTM (American Society for Testing and Materials) standards, providing a yield strength of over 280 MPa. It has a tensile strength of over 350 MPa. Thanks to its high yield strength and low elongation, it is widely used for parts that require less forming.

Applications

Auto chassis parts that require high strength and fatigue resistance, such as suspension

Mechanical Properties
기계적성질의 세부 스펙
Guaranteed
Value
Class 0.2%YS, MPa
Spec.
TS, MPa
Spec.
El., %
Spec.
YS PO 280~350 350~ 30~
Coating Information
Uncoated, Electrogalvanized, Galvanized, Galvannealed 의 Commercial products, Customer trial 구분 표시
Uncoated Electrogalvanized Galvanized Galvannealed
Commercial products - - -
Commercial products Commercial products Customer trial Customer trial
A715-50

Hot rolled A715-50 is compliant with ASTM (American Society for Testing and Materials) standards, providing a yield strength of over 346 MPa. It has a tensile strength of over 414 MPa. Thanks to its high yield strength and low elongation, it is widely used for parts that require less forming.

Applications

Auto chassis parts that require high strength and fatigue resistance, such as wheels and suspension

Mechanical Properties
기계적성질의 세부 스펙
Guaranteed
Value
Class 0.2%YS, MPa
Spec.
TS, MPa
Spec.
El., %
Spec.
YS PO 346~ 414~ 23~
Coating Information
Uncoated, Electrogalvanized, Galvanized, Galvannealed 의 Commercial products, Customer trial 구분 표시
Uncoated Electrogalvanized Galvanized Galvannealed
Commercial products - - -
Commercial products Commercial products Customer trial Customer trial
A715-55

Hot rolled A715-55 is compliant with ASTM (American Society for Testing and Materials) standards, providing a yield strength of over 380 MPa. It has a tensile strength of over 480 MPa. Thanks to its high yield strength and low elongation, it is widely used for parts that require less forming.

Applications

Auto chassis parts that require high strength and fatigue resistance, such as wheels and suspension

Mechanical Properties
기계적성질의 세부 스펙
Guaranteed
Value
Class 0.2%YS, MPa
Spec.
TS, MPa
Spec.
El., %
Spec.
YS PO 380~ 480~ 18~
Coating Information
Uncoated, Electrogalvanized, Galvanized, Galvannealed 의 Commercial products, Customer trial 구분 표시
Uncoated Electrogalvanized Galvanized Galvannealed
Commercial products - - -
Commercial products Commercial products Customer trial Customer trial
A715-60

Hot rolled A715-60 is compliant with ASTM (American Society for Testing and Materials) standards, providing a yield strength of over 410 MPa. It has a tensile strength of over 480 MPa. Thanks to its high yield strength and low elongation, it is widely used for parts that require less forming.

Applications

Auto chassis parts that require high strength and fatigue resistance, such as wheels and suspension

Mechanical Properties
기계적성질의 세부 스펙
Guaranteed
Value
Class 0.2%YS, MPa
Spec.
TS, MPa
Spec.
El., %
Spec.
YS PO 410~ 480~ 20~
Coating Information
Uncoated, Electrogalvanized, Galvanized, Galvannealed 의 Commercial products, Customer trial 구분 표시
Uncoated Electrogalvanized Galvanized Galvannealed
Commercial products - - -
Commercial products Commercial products Customer trial Customer trial
A715-65

Hot rolled A715-65 is compliant with ASTM (American Society for Testing and Materials) standards, providing a yield strength of over 450 MPa. It has a tensile strength of over 520 MPa. Thanks to its high yield strength and low elongation, it is widely used for parts that require less forming.

Applications

Auto chassis parts that require high strength and fatigue resistance, such as wheels and suspension

Mechanical Properties
기계적성질의 세부 스펙
Guaranteed
Value
Class 0.2%YS, MPa
Spec.
TS, MPa
Spec.
El., %
Spec.
YS PO 450~ 520~ 14~
Coating Information
Uncoated, Electrogalvanized, Galvanized, Galvannealed 의 Commercial products, Customer trial 구분 표시
Uncoated Electrogalvanized Galvanized Galvannealed
Commercial products - - -
Commercial products Commercial products Customer trial Customer trial
A715-70

Hot rolled A715-70 is compliant with ASTM (American Society for Testing and Materials) standards, providing a yield strength of over 500 MPa. It has a tensile strength of over 570 MPa. Thanks to its high yield strength and low elongation, it is widely used for parts that require less forming.

Applications

Auto chassis parts that require high strength and fatigue resistance, such as wheels and suspension

Mechanical Properties
기계적성질의 세부 스펙
Guaranteed
Value
Class 0.2%YS, MPa
Spec.
TS, MPa
Spec.
El., %
Spec.
YS PO 500~600 570~ 18~
Coating Information
Uncoated, Electrogalvanized, Galvanized, Galvannealed 의 Commercial products, Customer trial 구분 표시
Uncoated Electrogalvanized Galvanized Galvannealed
Commercial products - - -
Commercial products Commercial products Customer trial Customer trial
A715-80

Hot rolled A715-80 is compliant with ASTM (American Society for Testing and Materials) standards, providing a yield strength of over 550 MPa, the highest of all hot rolled HSLA steels. It has a tensile strength of over 620 MPa. Thanks to its high yield strength and low elongation, it is widely used for parts that require less forming.

Applications

Auto chassis parts that require high strength and fatigue resistance, such as wheels and suspension

Mechanical Properties
기계적성질의 세부 스펙
Guaranteed
Value
Class 0.2%YS, MPa
Spec.
TS, MPa
Spec.
El., %
Spec.
YS PO 550~650 620~ 16~
Coating Information
Uncoated, Electrogalvanized, Galvanized, Galvannealed 의 Commercial products, Customer trial 구분 표시
Uncoated Electrogalvanized Galvanized Galvannealed
Commercial products - - -
Commercial products Commercial products Customer trial Customer trial
440C

Hot rolled 440C provides a tensile strength of over 440 MPa. In general, customers in America and Europe use yield strength to classify steel while those in Asia including Korea and Japan use tensile strength for the same purpose. Hot rolled 440C is used for auto chassis parts that require high strength such as hot rolled A715-xx steels have.

Applications

Auto chassis parts that require high strength and fatigue resistance, such as wheels and suspension

Mechanical Properties
기계적성질의 세부 스펙
Guaranteed
Value
Class 0.2%YS, MPa
Spec.
TS, MPa
Spec.
El., %
Spec.
TS PO 305~440 440~ 27~
Coating Information
Uncoated, Electrogalvanized, Galvanized, Galvannealed 의 Commercial products, Customer trial 구분 표시
Uncoated Electrogalvanized Galvanized Galvannealed
Commercial products - - -
Commercial products Commercial products Customer trial Customer trial
540C

Hot rolled 540C provides a tensile strength of over 540 MPa. In general, customers in America and Europe use yield strength to classify steel while those in Asia including Korea and Japan use tensile strength for the same purpose. Hot rolled 540C is used for auto chassis parts that require a higher strength than 440C.

Applications

Auto chassis parts that require high strength and fatigue resistance, such as wheels and suspension

Mechanical Properties
기계적성질의 세부 스펙
Guaranteed
Value
Class 0.2%YS, MPa
Spec.
TS, MPa
Spec.
El., %
Spec.
TS PO 355~ 540~ 22~
Coating Information
Uncoated, Electrogalvanized, Galvanized, Galvannealed 의 Commercial products, Customer trial 구분 표시
Uncoated Electrogalvanized Galvanized Galvannealed
Commercial products - - -
Commercial products Commercial products Customer trial Customer trial
590C

Hot rolled 590C provides a tensile strength of over 590 MPa. In general, customers in America and Europe use yield strength to classify steel while those in Asia including Korea and Japan use tensile strength for the same purpose. Hot rolled 590C is used for auto chassis parts that require a higher strength than 540C.

Applications

Auto chassis parts that require high strength and fatigue resistance, such as wheels and suspension

Mechanical Properties
기계적성질의 세부 스펙
Guaranteed
Value
Class 0.2%YS, MPa
Spec.
TS, MPa
Spec.
El., %
Spec.
TS PO 420~ 590~ 20~
Coating Information
Uncoated, Electrogalvanized, Galvanized, Galvannealed 의 Commercial products, Customer trial 구분 표시
Uncoated Electrogalvanized Galvanized Galvannealed
Commercial products - - -
Commercial products Commercial products Customer trial Customer trial
780C

Hot rolled 780C provides a tensile strength of over 780 MPa. In general, customers in America and Europe use yield strength to classify steel while those in Asia including Korea and Japan use tensile strength for the same purpose. Hot rolled 780C has the highest tensile strength of all hot rolled HSLA steels and is extensively used for auto chassis parts that require high strength.

Applications

Auto chassis parts that require high strength and fatigue resistance, such as wheels and suspension

Mechanical Properties
기계적성질의 세부 스펙
Guaranteed
Value
Class 0.2%YS, MPa
Spec.
TS, MPa
Spec.
El., %
Spec.
TS PO 685~835 780~ 14~29
Coating Information
Uncoated, Electrogalvanized, Galvanized, Galvannealed 의 Commercial products, Customer trial 구분 표시
Uncoated Electrogalvanized Galvanized Galvannealed
Commercial products - - -
Commercial products Commercial products Customer trial Customer trial

What is R-Class (Rephosphorized) Steel?

Made by adding substitutional alloy elements such as P and Mn to low carbon steel. Such substitutional elements can cause grid deformation and increase internal stress, which disrupts dislocation motion and thus improves strength. In general, substitutional elements have less strength enhancing effect than interstitial atoms.

310R

Hot rolled 310R provides a tensile strength of over 310 MPa, ideal for customers that require a higher strength than hot rolled commercial steel.

Applications

Automotive chassis parts that require a higher strength than hot rolled commercial steel, including members and suspension

Mechanical Properties
기계적성질의 세부 스펙
Guaranteed
Value
Class 0.2%YS, MPa
Spec.
TS, MPa
Spec.
El., %
Spec.
TS PO 186~ 310~ 34~
Coating Information
Uncoated, Electrogalvanized, Galvanized, Galvannealed 의 Commercial products, Customer trial 구분 표시
Uncoated Electrogalvanized Galvanized Galvannealed
Commercial products - - -
Commercial products Commercial products Customer trial Customer trial
370R

Hot rolled 310R provides a tensile strength of over 370 MPa, thus ideal for auto chassis parts that require higher strength than hot rolled 310R.

Applications

Automotive chassis parts that require a higher strength than hot rolled 310R, including members and suspension

Mechanical Properties
기계적성질의 세부 스펙
Guaranteed
Value
Class 0.2%YS, MPa
Spec.
TS, MPa
Spec.
El., %
Spec.
TS PO 225~ 370~ 33~
Coating Information
Uncoated, Electrogalvanized, Galvanized, Galvannealed 의 Commercial products, Customer trial 구분 표시
Uncoated Electrogalvanized Galvanized Galvannealed
Commercial products - Customer trial Customer trial
Commercial products Commercial products Customer trial Customer trial
400R

Hot rolled 400R provides a tensile strength of over 400 MPa, thus ideal for auto chassis parts that require high strength including members and chassis parts.

Applications

Automotive chassis parts that require a higher strength than hot rolled 370R, including members and suspension

Mechanical Properties
기계적성질의 세부 스펙
Guaranteed
Value
Class 0.2%YS, MPa
Spec.
TS, MPa
Spec.
El., %
Spec.
TS PO 255~ 401~ 32~
Coating Information
Uncoated, Electrogalvanized, Galvanized, Galvannealed 의 Commercial products, Customer trial 구분 표시
Uncoated Electrogalvanized Galvanized Galvannealed
Commercial products - - -
Commercial products Commercial products Customer trial Customer trial
440R

Hot rolled 440R provides a tensile strength of over 440 MPa and a yield strength of over 305 MPa. It has the highest tensile strength of all hot rolled R-Class (Rephosphorized) steels.

Applications

Automotive chassis parts that require high strength and fatigue resistance, including members and suspension

Mechanical Properties
기계적성질의 세부 스펙
Guaranteed
Value
Class 0.2%YS, MPa
Spec.
TS, MPa
Spec.
El., %
Spec.
TS PO 305~ 440~ 30~
Coating Information
Uncoated, Electrogalvanized, Galvanized, Galvannealed 의 Commercial products, Customer trial 구분 표시
Uncoated Electrogalvanized Galvanized Galvannealed
Commercial products - Customer trial Customer trial
Commercial products Commercial products Customer trial Customer trial

ATOS(AuTOmotive Structural) Steel 이란?

나노 크기의 석출물과 지름 1~3㎛의 미세립으로 구성된 고강도 열간압연 제품입니다. 나노 크기의 석출물에 의한 석출 강화 효과로 높은 인장강도를 가지며, 재결정제어압연으로 만들어진 미세한 페라이트 결정립으로 우수한 내충격성 및 안정된 피로 특성을 지닙니다. 내부 품질 향상을 위해 강 내부 불순물 및 유화물 형성을 제어합니다.

ATOS540

ATOS540 provides a yield strength of over 344 MPa and a tensile strength of over 540 MPa. With good impact toughness and fatigue resistance, it is widely used for structural members in motor vehicles, frames of commercial vehicles and boom arms of heavy-duty equipment.

Applications

Frames of commercial vehicles and crane booms of heavy-duty equipment that require high strength and fatigue resistance

Mechanical Properties
기계적성질의 세부 스펙
Guaranteed
Value
Class 0.2%YS, MPa
Spec.
TS, MPa
Spec.
El., %
Spec.
TS HR 344 540~ 20~
Coating Information
Uncoated, Electrogalvanized, Galvanized, Galvannealed 의 Commercial products, Customer trial 구분 표시
Uncoated Electrogalvanized Galvanized Galvannealed
Commercial products - - -
Commercial products Commercial products Customer trial Customer trial
ATOS590

Frames of commercial vehicles and crane booms of heavy-duty equipment that require high strength and fatigue resistance

Applications

Structural members in motor vehicles, frames of commercial vehicles and boom arms of heavy-duty equipment that require good impact toughness and fatigue resistance

Mechanical Properties
기계적성질의 세부 스펙
Guaranteed
Value
Class 0.2%YS, MPa
Spec.
TS, MPa
Spec.
El., %
Spec.
TS HR 419~ 616~ 19~
Coating Information
Uncoated, Electrogalvanized, Galvanized, Galvannealed 의 Commercial products, Customer trial 구분 표시
Uncoated Electrogalvanized Galvanized Galvannealed
Commercial products - - -
Commercial products Commercial products Customer trial Customer trial
ATOS780

ATOS780 provides a yield strength of over 675 MPa and a tensile strength of over 780 MPa. The steel is widely used for structural members in motor vehicles, frames of commercial vehicles and boom arms of heavy-duty equipment.

Applications

Structural members in motor vehicles, frames of commercial vehicles and boom arms of heavy-duty equipment that require good impact toughness and fatigue resistance

Mechanical Properties
기계적성질의 세부 스펙
Guaranteed
Value
Class 0.2%YS, MPa
Spec.
TS, MPa
Spec.
El., %
Spec.
TS HR 675~ 785~ 14~
Coating Information
Uncoated, Electrogalvanized, Galvanized, Galvannealed 의 Commercial products, Customer trial 구분 표시
Uncoated Electrogalvanized Galvanized Galvannealed
Commercial products - - -
Commercial products Commercial products Customer trial Customer trial
ATOS980

ATOS980 has a yield strength of over 880 MPa and a tensile strength of over 980 MPa, the highest of all hot rolled ATOS products. The steel is widely used for structural members in motor vehicles, frames of commercial vehicles and boom arms of heavy-duty equipment that require ultra-high strength

Applications

Structural members in motor vehicles, frames of commercial vehicles and boom arms of heavy-duty equipment that require ultra-high strength

Mechanical Properties
기계적성질의 세부 스펙
Guaranteed
Value
Class 0.2%YS, MPa
Spec.
TS, MPa
Spec.
El., %
Spec.
TS HR 880~ 980~ 8~
Coating Information
Uncoated, Electrogalvanized, Galvanized, Galvannealed 의 Commercial products, Customer trial 구분 표시
Uncoated Electrogalvanized Galvanized Galvannealed
Commercial products - - -
Commercial products Commercial products Customer trial Customer trial

Advanced High Strength Steel

Advanced high strength steel is metallurgically classified as transformation toughened steel using low-temperature transformation structure. Its variants include DP (Dual Phase) steel, TRIP (TRansformation Induced Plasticity) steel, XF (eXtra Formable) steel, TWIP (TWinning Induced Plasticity) steel, CP (Complex Phase) steel, Mart (Martensitic) Steel, FB (Ferrite and Bainite) steel and HB (Hyper Burring) steel. Among them, those having a tensile strength of over 1 GPa are called giga steel.

Key Products

  • - POSCO : PHT590D/780D, PHT590F/780F, PDT880W
Related Industries
Automotive Chassis

What is DP (Dual Phase) Steel?

Dual phase (DP) steel is intended for those requiring ultra-high strength steel sheets to reduce body weight in their cars. It consists of a ferrite matrix and martensite having phase 2 structure. Featuring a low yield ratio of 0.5 to 0.6, DP steel is easy to work on and has the second highest elongation after TRIP steel. It also has good bake hardening since it is cooled quickly after being heated in an annealing furnace and goes through an overaging section at a temperature lower than Ms (to avoid hardening).

590DP

Hot rolled 590DP provides a yield strength of over 305 MPa and a tensile strength of over 590 MPa, thus ideal for auto chassis parts that require higher strength such as chassis parts.

Applications

Auto chassis parts that require impact toughness, such as suspension, arms and wheel discs

Mechanical Properties
기계적성질의 세부 스펙
Guaranteed
Value
Class 0.2%YS, MPa
Spec.
TS, MPa
Spec.
El., %
Spec.
TS CR/EG ~450 590~ 24~
GI/GA ~450 590~ 24~
Coating Information
Uncoated, Electrogalvanized, Galvanized, Galvannealed 의 Commercial products, Customer trial 구분 표시
Uncoated Electrogalvanized Galvanized Galvannealed
Commercial products Commercial products Commercial products Commercial products
Commercial products Commercial products Customer trial Customer trial
780DP

Hot rolled 780DP has a yield strength of over 440 MPa and a tensile strength of over 780 MPa, the highest of all hot rolled DP products

Applications

Auto chassis parts that require high strength and impact toughness, such as suspension, arms and wheel discs

Mechanical Properties
기계적성질의 세부 스펙
Guaranteed
Value
Class 0.2%YS, MPa
Spec.
TS, MPa
Spec.
El., %
Spec.
TS CR/EG ~625 780~ 14~
GI/GA 400~625 780~ 16~
Coating Information
Uncoated, Electrogalvanized, Galvanized, Galvannealed 의 Commercial products, Customer trial 구분 표시
Uncoated Electrogalvanized Galvanized Galvannealed
Commercial products - Commercial products Commercial products
Commercial products Commercial products Customer trial Customer trial

What is FB (Ferritic-Bainitic) Steel?

This steel is ferrite-bainite dual phase steel intended to provide a better hole expansion ratio. Ferrite has good elongation while bainite has good flangeability. Combination of the two means excellent hole expansion. To achieve quality FB steel, it is imperative to keep hot rolled steel sheet in the ferrite area properly to create highly pure ferrite and then concentrate solute atoms on untransformed austenite before cooling it quickly to ensure that austenite can transform into bainite.

440FB

Hot rolled 440FB provides a tensile strength of over 440 MPa, thus ideal for auto chassis parts that require HER of over 50. Hot rolled 440FB is dual phase steel consisting of ferrite and bainite. The minimal difference in harness between the two elements means that the steel has a good HER.

Applications

Auto chassis parts that require a high HER, such as arms and wheel discs

Mechanical Properties
기계적성질의 세부 스펙
Guaranteed
Value
Class 0.2%YS, MPa
Spec.
TS, MPa
Spec.
El., %
Spec.
TS PO 305~445 440~ 32~
540FB

Hot rolled 540FB is commonly used for chassis components that require a tensile strength of over 540 MPa, a yield strength of over 355 MPa and HER of over 50. 540FB is made by controlling the size and fraction between ferrite and bainite relative to 440FB to give it higher strength.

Applications

Auto chassis parts that require a high HER, such as arms and wheel discs

Mechanical Properties
기계적성질의 세부 스펙
Guaranteed
Value
Class 0.2%YS, MPa
Spec.
TS, MPa
Spec.
El., %
Spec.
TS PO 410~550 540~ 24~
590FB

Hot rolled 590FB is commonly used for chassis components that require a tensile strength of over 590 MPa, a yield strength of over 420 MPa and HER of over 50. It also has the highest HER of all hot rolled steels having a tensile strength of 590 MPa. This makes the steel ideal for automotive parts that require high strength and high HER.

Applications

Auto chassis parts that require high HER, such as suspension, arms and wheel discs

Mechanical Properties
기계적성질의 세부 스펙
Guaranteed
Value
Class 0.2%YS, MPa
Spec.
TS, MPa
Spec.
El., %
Spec.
TS PO 420~ 590~ 22~
780FB

Hot rolled 780FB is commonly used for chassis components that require a tensile strength of over 780 MPa, a yield strength of over 540 MPa and HER of over 50. It also has the highest tensile strength of all hot rolled FB steels and is commonly used for automotive parts that require high strength hot rolled pates for lightweight purposes.

Applications

Auto chassis components that require high strength and high HER, such as suspension, arms and wheel discs

Mechanical Properties
기계적성질의 세부 스펙
Guaranteed
Value
Class 0.2%YS, MPa
Spec.
TS, MPa
Spec.
El., %
Spec.
TS PO 600~800 780~ 13~
780HB

Hot rolled 780HB (hyper burring) steel is single-phase ferritic steel having nanosize precipitation. The steel has very high strength and HER. This is because it has ferritic single phase featuring fine precipitation without coarse and large carbide. It experiences no red scale as it does not use Si as an alloy element and features superb surface quality. Designed to have a low carbon equivalent, it has good weldability.

Applications

Auto chassis parts that require a higher HER than 780HB, such as suspension, arms and wheel discs

Mechanical Properties
기계적성질의 세부 스펙
Guaranteed
Value
Class 0.2%YS, MPa
Spec.
TS, MPa
Spec.
El., %
Spec.
HER(%)
Spec.
TS PO 675~825 780~ 15~ 65~55~

What is TWIP (TWinning Induced Plasticity) Steel?

As a single-phase austenitic steel featuring high carbon and high manganese, this steel experiences deformation twin upon machining, showing improved strain hardening ratio, strength and elongation. Photos of its microstructure taken during tensile testing provide proof of deformation twin. The greater the degree of deformation, the more twins occur.

880TWIP

Hot rolled 880TWIP provides a tensile strength of over 880 MPa. With higher strength and elongation than hot rolled commercial steel, it can be used for wheel or chassis parts that require high formability.

Applications

Auto chassis parts that can help reduce stamping such as lower arms and those with a sophisticated shape, such as styled wheels

Mechanical Properties
기계적성질의 세부 스펙
Guaranteed
Value
Class 0.2%YS, MPa
Spec.
TS, MPa
Spec.
El., %
Spec.
TS GI 480 880~ 45~
Coating Information
Uncoated, Electrogalvanized, Galvanized, Galvannealed 의 Commercial products, Customer trial 구분 표시
Uncoated Electrogalvanized Galvanized Galvannealed
Customer trial - - -
Commercial products Commercial products Customer trial Customer trial

What is MART (MARTensitic) Steel?

This steel consists of martensite matrix and a small amount of bainite or ferrite. It has the highest tensile strength of all carbon steels, but very low ductility. Quick cooling and then appropriate tempering can improve the steel’s yield strength.

1180MMART

Hot rolled 1180MART provides a tensile strength of over 1,180 MPa and a yield strength of 900 MPa. Products include HR and PO.

Applications

Structural members of commercial vehicles that are subjected to a high load, such as those that require roll forming including bumper beams and door impact beams, and truck frames

Mechanical Properties
기계적성질의 세부 스펙
Guaranteed
Value
Class 0.2%YS, MPa
Spec.
TS, MPa
Spec.
El., %
Spec.
TS PO 900~1150 1180~ 8~
Coating Information
Uncoated, Electrogalvanized, Galvanized, Galvannealed 의 Commercial products, Customer trial 구분 표시
Uncoated Electrogalvanized Galvanized Galvannealed
Customer trial - - -
Commercial products Commercial products Customer trial Customer trial
1470MART

Hot rolled 1470M provides a tensile strength of over 1,470 MPa and contains more alloy elements than 1300MART to increase tensile and yield strength. Products include HR and PO.

Applications

Structural members of commercial vehicles that are subjected to a high load, such as those that require roll forming including bumper beams and door impact beams, and truck frames

Mechanical Properties
기계적성질의 세부 스펙
Guaranteed
Value
Class 0.2%YS, MPa
Spec.
TS, MPa
Spec.
El., %
Spec.
TS PO 1175~ 1400~ 5~
Coating Information
Uncoated, Electrogalvanized, Galvanized, Galvannealed 의 Commercial products, Customer trial 구분 표시
Uncoated Electrogalvanized Galvanized Galvannealed
Customer trial - - -
Commercial products Commercial products Customer trial Customer trial

Post Heat Treatment Steel

Post Heat Treatment Steel allows you to define heating/cooling conditions before or after the processing of steel. Its types include HPF (Hot Press Forming) steel, Autobeam and Stab (Stabilizer).
* Autobeam and Stab are registered product names.

Key Products

  • - POSCO : PHT1470H/1800H
Related Industries
Automotive Chassis

PHT

What is PHT (Post Heat Treatment) Steel?

Unlike HPF that goes through tempering after forming within a cast, PHT steel is hot rolled before going through tempering. This way, the steel can have a very high strength. It also features high formability and weldability thanks to hardening elements such as B.

Autobeam

Hot rolled Autobeam gets tensile strength of around 1,300 MPa after forming and heat treatment. Autobeam is a registered product name of POSCO and mainly used for automotive parts.

Applications

Automotive parts that require impact toughness and safety upon impact, such as door impact beams

Mechanical Properties
기계적성질의 세부 스펙
Guaranteed
Value
Class 0.2%YS, MPa
Spec.
TS, MPa
Spec.
El., %
Spec.
Composition HR ~980 490~784 5~
Stab

Hot rolled Stab steel is intended for use in chassis components that require high impact toughness and fatigue resistance and is subjected to post heat treatment (quenching and tempering) to ensure sufficient strength. Post heat treatment after forming allows the steel to have a tensile strength of around 1,200 MPa. Stab is a registered product name of POSCO and mainly used for automotive parts.

Applications

Auto chassis parts that require impact toughness and fatigue resistance, such as stabilizers

Mechanical Properties
기계적성질의 세부 스펙
Guaranteed
Value
Class 0.2%YS, MPa
Spec.
TS, MPa
Spec.
El., %
Spec.
Composition HR ~1470 ~1470 10~
1470PHT

Hot rolled 1470PHT has higher strength than Autobeam and Stab steels. Its tensile strength after heat treatment is around 1,500 MPa.

Applications

Auto chassis parts that require impact toughness and fatigue resistance, such as coupled torsion beam axles (CTBAs), stabilizers and door impact beams

Mechanical Properties

Before heat treatment

기계적성질의 세부 스펙
Guaranteed
Value
Class 0.2%YS, MPa
Spec.
TS, MPa
Spec.
El., %
Spec.
Composition HR 350~550 500~750 16~

After heat treatment

기계적성질의 세부 스펙
Guaranteed
Value
Class 0.2%YS, MPa
Spec.
TS, MPa
Spec.
El., %
Spec.
Composition HR 350~1250 1,000~1,700 6~
Coating Information
Uncoated, Electrogalvanized, Galvanized, Galvannealed 의 Commercial products, Customer trial 구분 표시
Uncoated Electrogalvanized Galvanized Galvannealed
Commercial products - - -
Commercial products Commercial products Customer trial Customer trial
1800PHT

Hot rolled 1800PHT is ideal for applications that require a higher strength than 1470PHT. With 1,800 MPa after heat treatment, it has the highest tensile strength of all hot rolled steels.

Applications

Auto chassis parts that require impact toughness and fatigue resistance, such as coupled torsion beam axles (CTBAs), stabilizers and door impact beams

Mechanical Properties

Before heat treatment

기계적성질의 세부 스펙
Guaranteed
Value
Class 0.2%YS, MPa
Spec.
TS, MPa
Spec.
El., %
Spec.
Composition HR 350~600 600~800 16~

After heat treatment

기계적성질의 세부 스펙
Guaranteed
Value
Class 0.2%YS, MPa
Spec.
TS, MPa
Spec.
El., %
Spec.
Composition HR 1,300~1,500 1,700~1,900 8~
Coating Information
Uncoated, Electrogalvanized, Galvanized, Galvannealed 의 Commercial products, Customer trial 구분 표시
Uncoated Electrogalvanized Galvanized Galvannealed
Commercial products - - -
Commercial products Commercial products Customer trial Customer trial

High Carbon Steel

A carbon steel product is called high carbon steel when it contains carbon of no less than 0.30 wt.% or contains carbon of no less than 0.15 wt.% and has an alloy element to allow for heat treatment. After final heat treatment, it has high strength and hardness. Its common uses include auto parts and industrial machines.

Key Specifications

?
  • POSCOPOSCO Standards
  • KSKorean Industrial Standards
  • JISJapanese Industrial Standards
  • ENEuropean Standards
  • DINDentsches Institut fur Normung
  • BSBritish Standards
  • ASTMAmerican Society for Testing and Materials
  • SAESociety of Automotive Engineers
  • APIAmerican Petroleum Institute
닫기
  • - JIS : S35C-S55C, SK60~120, SCM415~440
  • - DIN : 50CRV4, 75CR 1
  • - SAE : SAE1035~1078
Related Industries
Automotive Chassis Machine Structure

Steel for Structure

Our products for this application include those for general structures, welding structures and architectural structures. Their common uses include iron structures, bridges, ships and motor vehicles.

Key Specifications

?
  • POSCOPOSCO Standards
  • KSKorean Industrial Standards
  • JISJapanese Industrial Standards
  • ENEuropean Standards
  • DINDentsches Institut fur Normung
  • BSBritish Standards
  • ASTMAmerican Society for Testing and Materials
  • SAESociety of Automotive Engineers
  • APIAmerican Petroleum Institute
닫기
  • - JIS : S330, SS400, SS490, SS540, SM400A/B/C, SM490A/B/C, SM400YA/YB, SM520B/C, SM570, SN400A/B/C, SN490B/C
  • - DIN : DIN17100 ST22, ST33, ST37-2, ST52-3, RST37-2
  • - BS : BS1449 PART1 50/35HR, HS, BS4360 43A/B/C, 50B/C/C
  • - ASTM : A36, A283, A570
Related Industries
Architectural Structure Bridge

Weather Resistance Steel

This product contains special elements such as P, Cu or Cr for improved resistance to corrosion in different environments. It is classified into those resistant to weathering, those resistant to corrosion caused by sulfuric acid from the combustion of fossil fuel and those resistant to salt contained seawater.

Key Specifications

?
  • POSCOPOSCO Standards
  • KSKorean Industrial Standards
  • JISJapanese Industrial Standards
  • ENEuropean Standards
  • DINDentsches Institut fur Normung
  • BSBritish Standards
  • ASTMAmerican Society for Testing and Materials
  • SAESociety of Automotive Engineers
  • APIAmerican Petroleum Institute
닫기
  • - POSCO : PAWS50, ANCOR-H, ANCOR-HS, Poseidon500/Pos1007MA
  • - JIS : SPA-H
Related Industries
Architectural Structure Interior and Exterior Bridge

Steel for Pipe and Tube

This product can be categorized into steel for structures, steel for pipes and steel for drawing. With superb weldability and formability, it is extensively used for architectural structures, pipe piles, gas pipes and car structures.

Key Specifications

?
  • POSCOPOSCO Standards
  • KSKorean Industrial Standards
  • JISJapanese Industrial Standards
  • ENEuropean Standards
  • DINDentsches Institut fur Normung
  • BSBritish Standards
  • ASTMAmerican Society for Testing and Materials
  • SAESociety of Automotive Engineers
  • APIAmerican Petroleum Institute
닫기
  • - POSCO : PACOS1/2, POSP290A~POSP540A
  • - JIS : SPHT1/2/3/4, STB340/410, STK290/400/490/500/540, STKM11A/12B/13A/13B/14B/16A/18A, STKN490B, STKT540/590
  • - ASTM : A178-A/C/D
Related Industries
Architectural Structure

Steel for Oil Well Pipe

This steel is used for drilling in severely cold areas and for deep sea oil wells. It is characterized by high strength, good abrasion toughness and good resistance to corrosion.

Key Specifications

?
  • POSCOPOSCO Standards
  • KSKorean Industrial Standards
  • JISJapanese Industrial Standards
  • ENEuropean Standards
  • DINDentsches Institut fur Normung
  • BSBritish Standards
  • ASTMAmerican Society for Testing and Materials
  • SAESociety of Automotive Engineers
  • APIAmerican Petroleum Institute
닫기
  • - API : 5G-J55, K55, N80, P110
Related Industries
Casing & Tubing

Steel for Linepipe

This steel is used to make line pipes that transport crude oil or petrochemical products. Its characteristics include high tensile strength, extremely low-temperature toughness, hydrogen-induced crack resistance and good weldability. This steel is classified into tensile steel that can withstand low temperatures and sour resistant steel that can defy corrosion.

Key Specifications

?
  • POSCOPOSCO Standards
  • KSKorean Industrial Standards
  • JISJapanese Industrial Standards
  • ENEuropean Standards
  • DINDentsches Institut fur Normung
  • BSBritish Standards
  • ASTMAmerican Society for Testing and Materials
  • SAESociety of Automotive Engineers
  • APIAmerican Petroleum Institute
닫기
  • - API : 5L-A/B, X42, X46, X52, X60, X65, X70, X80
Related Industries
Transportation

Steel for Gas Cylinder

This product is used to make high-pressure containers holding LPG, acetylene and other gasses. Featuring good machinability and resistance to pressure, it is used for containers having an inner volume of no greater than 500 liters.

Key Specifications

?
  • POSCOPOSCO Standards
  • KSKorean Industrial Standards
  • JISJapanese Industrial Standards
  • ENEuropean Standards
  • DINDentsches Institut fur Normung
  • BSBritish Standards
  • ASTMAmerican Society for Testing and Materials
  • SAESociety of Automotive Engineers
  • APIAmerican Petroleum Institute
닫기
  • - POSCO : Pos295-HF
  • - JIS : SG255/295/325/365
  • - ASTM: A515
Related Industries
Plant & Storage

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