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~

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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~

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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~

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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~

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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~

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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~

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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~

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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~

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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~

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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~

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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~

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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~

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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~

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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

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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~

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370R

Hot rolled 370R 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~

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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~

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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~

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What is ATOS(AuTOmotive Structural) Steel?

It is a high-strength hot rolling product consisting of nano-sized precipitates and fine grains with a diameter of 1to 3 μm. It has high tensile strength due to the precitpitation strengthening by nano-sized precipitates, and excellent impact resistance and stable fatigue resistance with fine ferrite grains made by recrystallization controlled rolling. We controls the formation of impurities and emulsions in the steel to improve internal quality.

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~

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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~

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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~

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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~

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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~

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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~

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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~

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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~

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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~

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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 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 Customer trial