CQ

Cold-rolled Commercial Quality grade steels are manufactured as low-carbon steels and have tensile strength of more than 270MPa. They are most widely used for automotive inner parts for general drawing processing. Products are CR, EG, GI and GA.

Applications

Mechanical Properties

Automotive parts that require regular machining

기계적성질의 세부 스펙

Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.
TS	CR/EG	~343	270~	33~
	GI/GA	~294	274~	34~

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DQ

Cold-rolled drawing quality steel is manufactured as ultra-low carbon steel(Continous annealing process), has tensile strength of more than 270MPa, and is used for inner parts and outer parts of automotive parts for general drawing processing. Products are CR, EG, GI and GA.

Applications

Inner motor vehicle parts that require higher formability than CQ

Mechanical Properties

기계적성질의 세부 스펙

Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.
TS	CR/EG	~345	270~	33~
	GI/GA	~200	270~	36~

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DDQ

Cold-rolled Deep Drawing Quality steel is manufactured as ultra-low carbon steel(Continous annealing process), has tensile strength of more than 270MPa and elongation of more than 36%. It is used for inner parts and outer parts of automotive parts for deep drawing processing. In particular, strict surface quality is maintained for the application of outer parts. Products are CR, EG, GI and GA.

Applications

Inner and outer motor vehicle parts including the rear floor that require high formability

Mechanical Properties

기계적성질의 세부 스펙

Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.
TS	CR/EG	~294	270~	36~
	GI/GA	~188	274~	38~

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EDDQ

Cold-rolled Extra Deep Drawing Quality steel is manufactured as ultra low carbon steel, has tensile strength of more than 260MPa and elongation of more than 44%. In particular, strict surface quality is maintained for the application of outer parts. Products are CR, EG, GI and GA.

Applications

Outer auto parts such as doors and fenders that require high formability and surface quality

Mechanical Properties

기계적성질의 세부 스펙

Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.
TS	CR/EG	~294	265~	44~
	GI/GA	~170	270~380	44~

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S-EDDQ

Cold-rolled Super-EDDQ steel is manufactured as ultra-low carbon steel, has a tensile strength of more than 260MPa and elongation of more than 47%. And it is used for automotive outer parts for ultra deep drawing processing. In particular, strict surface quality is maintained for the application of outer parts. Products are CR, EG, GI and GA.

Applications

Outer auto parts such as side outers that require higher formability and surface quality than EDDQ

Mechanical Properties

기계적성질의 세부 스펙

Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.
TS	CR/EG	~294	260~	47~
	GI/GA	~167	265~	48~

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What is BH (Bake-Hardenable) Steel?

BH (bake-hardenable) steel is made by adding interstitial elements to extra low carbon steel and applying hardening process for a higher yield strength. Bake-hardenable steel is easy to form during the early stage of forming and sees an increased yield strength of 30 MPa in the bake hardening effect as the process unfolds. Since it has a higher dent resistance than commercial quality steel, it maintains good dent resistance even after its thickness is reduced.

180YB

180YB provides a yield strength of over 180 MPa, which can be increased to over 210 MPa after the bake. This steel is extensively used for motor vehicles’ outer panels that require high dent resistance and formability, such as hoods and door outers. Products include CR, EG, GI and GA.

Applications

Outer auto parts that require high dent resistance and formability, such as hoods, doors and fenders

Mechanical Properties

기계적성질의 세부 스펙

Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.	BH, MPa Spec.
YS	CR/EG	180~240	270~	40~	30~
	GI/GA	180~240	270~	40~	30~

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210YB

210YB is ideal for applications that require a higher strength than 180YB. 210YB provides a yield strength of over 210 MPa, which can be increased to over 240 MPa after the bake. It is widely used for outer auto parts, and its surface quality is strictly controlled. Products include CR, EG, GI and GA

Applications

Outer auto parts such as hoods, doors, fenders, etc. that require higher dent resistance than 180YB

Mechanical Properties

기계적성질의 세부 스펙

Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.	BH, MPa Spec.
YS	CR/EG	210~270	240~	38~	30~
	GI/GA	210~270	240~	38~	30~

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240YB

240YB provides a yield strength of over 240 MPa, which can be increased to over 270 MPa after the bake. It is widely used for outer auto parts, and its surface quality is strictly controlled. Products include CR, EG, GI and GA.

Applications

Outer auto parts such as trunks, hoods, doors, fenders, etc. that require higher dent resistance than 210YB

Mechanical Properties

기계적성질의 세부 스펙

Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.	BH, MPa Spec.
YS	CR/EG	240~300	340~450	36~	30~
	GI/GA	240~300	340~450	36~	30~

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270YB

270YB provides a yield strength of over 270 MPa, which can be increased to over 300 MPa after the bake. It is classified as high strength steel with a tensile strength of over 390 MPa. Its sub-categories include CR, EG, GI and GA.

Applications

Inner and outer auto parts such as trunks, hoods, doors, etc. that require high strength and dent resistance

Mechanical Properties

기계적성질의 세부 스펙

Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.	BH, MPa Spec.
YS	GI/GA	250~330	390~	35~	30~

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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.

220YC

220YC provides a yield strength of over 220 MPa. Its most common application is automotive reinforcement that require high strength, and its sub-categories include CR, EG, GI and GA.

Applications

Automotive reinforcement that is exposed or requires high strength, such as side sills and center members

Mechanical Properties

기계적성질의 세부 스펙

Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.
YS	CR	220~330	340~450	28~
	GI/GA	220~340	340~450	28~

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260YC

260YC provides a yield strength of over 260 MPa. Its most common application is automotive reinforcement that requires a higher yield strength than 210YC, and its sub-categories include CR, EG, GI and GA.

Applications

Automotive reinforcement that is exposed or requires high strength, such as side sills and center members

Mechanical Properties

기계적성질의 세부 스펙

Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.
YS	CR	260~340	350~430	28~
	GI/GA	260~340	350~430	28~

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300YC

300YC provides a yield strength of over 300 MPa. Its most common application is automotive reinforcement that requires a higher yield strength than 260YC, and its sub-categories include CR, EG, GI and GA.

Applications

Automotive reinforcement that is exposed or requires high strength, such as side sills and center members

Mechanical Properties

기계적성질의 세부 스펙

Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.
YS	CR	300~380	380~480	22~
	GI/GA	300~380	380~480	22~

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340YC

340YC provides a yield strength of over 340 MPa. Its most common application is automotive reinforcement that requires a high tensile strength of over 410 MPa, and its sub-categories include CR, EG, GI and GA

Applications

Automotive reinforcement that is exposed or requires high strength, such as side sills and center members

Mechanical Properties

기계적성질의 세부 스펙

Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.
YS	CR	340~440	410~530	18~
	GI/GA	340~440	410~530	20~

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380YC

380YC provides a yield strength of over 380 MPa. Its most common application is automotive reinforcement that requires a high tensile strength of over 460 MPa, and its sub-categories include CR, EG, GI and GA.

Applications

Automotive reinforcement that is exposed or requires high strength, such as side sills and center members

Mechanical Properties

기계적성질의 세부 스펙

Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.
YS	CR	380~500	460~600	18~
	GI/GA	380~500	460~600	18~

Coating

42

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420YC

420YC provides a yield strength of over 420 MPa. Its most common application is automotive reinforcement that requires a high tensile strength of over 490 MPa, and its sub-categories include CR, EG, GI and GA.

Applications

Automotive reinforcement that is exposed or requires high strength, such as side sills and center members

Mechanical Properties

기계적성질의 세부 스펙

Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.
YS	CR	420~530	490~600	16~
	GI/GA	420~530	490~600	16~

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440C

440YC provides a tensile strength of over 440 MPa. It is made by increasing the content of precipitation enhancing elements to meet the need for higher strength to achieve reduced weight in motor vehicles. Its most common application is automotive reinforcement that requires high strength, and its sub-categories include CR, EG, GI and GA.

Applications

Automotive reinforcement that is exposed or requires high strength, such as side sills and center members

Mechanical Properties

기계적성질의 세부 스펙

Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.
YS	CR/EG	300~	440~	25~
	GI/GA	-	-	-

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590C

With over 590 MPa, 590C has the highest tensile strength of all HSLAs. Its most common application is automotive reinforcement that requires high strength, and its sub-categories include CR, GI and GA.

Applications

Automotive reinforcement that is exposed or requires high strength, such as side sills and center members

Mechanical Properties

기계적성질의 세부 스펙

Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.
YS	CR/EG	353~	588~	17~
	GI/GA	-	-	-

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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.

340R

340R provides a tensile strength of over 340 MPa. Products include CR, EG, GI and GA.

Applications

Inner automotive parts that require high strength, including cowls, wheel aprons and side front members

Mechanical Properties

기계적성질의 세부 스펙

Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.
TS	CR/EG	187~	340~	32~
	GI/GA	186~330	440~	35~

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390R

390R provides a tensile strength of over 390 MPa. Products include CR, EG, GI and GA.

Applications

Inner automotive parts that require high strength, including cowls, wheel aprons and side front members

Mechanical Properties

기계적성질의 세부 스펙

Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.
TS	CR/EG	236~	390~	29~
	GI/GA	195~	390~500	27~

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440R

440R provides a tensile strength of 440 MPa, the highest of all cold rolled R-Class (rephosphorized) steels. Products include CR, EG, GI and GA.

Applications

Inner automotive parts that require high strength, including cowls, wheel aprons and side front members

Mechanical Properties

기계적성질의 세부 스펙

Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.
TS	CR/EG	275~	440~	25~
	GI/GA	235~	440~	26~

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What is IF High Strength Steel (HSS)?

This steel is intended for customers that require higher strength to achieve reduced weight for their motor vehicles. The steel’s deep drawing can be achieved by adding Ti, the oxi-nitrocarburizing element, to ultra-low carbon steel while its high strength can be achieved by substitutional elements such as P and Mn to ultra-low carbon steel. B is added to minimize grain embrittlement that might be caused by segregation P.

180Y-XR

180Y-XR (eXtra R) is intended for applications that require higher formability than 180YE. Its yield strength is over 180 MPa and elongation is over 42 percent. 180Y-XR features a very low level of interstitial elements {111} and increased density to increase insulation performance (R-value). With the highest elongation of all IF HSS steels, it can be used for parts that require high strength and deep drawability. Products include CR and GA.

Applications

Outer auto parts that require high formability, such as side outers

Mechanical Properties

기계적성질의 세부 스펙

Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.
YS	CR/EG	180~	320~	42~
	GI/GA	180~	320~	42~

Coating

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180YE

180YE provides a yield strength of over 180 MPa and elongation of over 34%. It is widely used for parts that require high strength and deep drawability. Those intended for the exterior, in particular, are subject to strict quality assurance practices. Products include CR, EG, GI and GA.

Applications

Inner and outer auto parts that require high formability, such as doors, fenders and floors

Mechanical Properties

기계적성질의 세부 스펙

Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.
YS	CR/EG	180~240	340~	34~
	GI/GA	180~240	340	34~

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220YE

220YE provides a yield strength of over 220 MPa and elongation of over 32 percent. It is widely used for parts that require high strength and deep drawability. Those intended for the exterior, in particular, are subject to strict quality assurance practices. Products include CR, EG, GI and GA.

Applications

Inner and outer auto parts that require high formability, such as doors, fenders and floors

Mechanical Properties

기계적성질의 세부 스펙

Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.
YS	CR/EG	220~260	340~	32~
	GI/GA	220~260~	340~	32~

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260YE

260YE provides a yield strength of over 260 MPa and a tensile strength of over 390 MPa. Its most common application is automotive parts that require high strength, and its sub-categories include CR, EG, GI and GA.

Applications

Inner and outer auto parts that require high formability and high strength, such as doors, fenders and floors

Mechanical Properties

기계적성질의 세부 스펙

Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.
YS	CR/EG	260~	390~500	27~
	GI/GA	260~	390~500	27~

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300YE

300YE provides a yield strength of over 300 MPa and a tensile strength of over 380 MPa. Its most common application is automotive parts that require a higher yield strength than 260YE, and its sub-categories include CR, EG, GI and GA.

Applications

Inner and outer auto parts that require high formability and high strength, such as doors, fenders and floors

Mechanical Properties

기계적성질의 세부 스펙

Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.
YS	CR/EG	300~360	360~480	22~
	GI/GA	300~360	360~480	22~

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340E

340E provides a tensile strength of over 340 MPa and elongation of over 32 percent. Its most common application is automotive parts that require high strength and deep drawability, and its sub-categories include CR, EG, GI and GA.

Applications

Inner and outer auto parts that require high formability, such as side outers, doors, fenders and floors

Mechanical Properties

기계적성질의 세부 스펙

Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.
TS	CR/EG	167~	340~	32~
	GI/GA	167~	340~	32~

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340ES

340ES provides a tensile strength of over 340 MPa and elongation of over 35 percent. With better elongation than 340E, it is extensively used for parts of the sophisticated shape. In particular, the steel used for outer parts is subject to strict quality assurance practices, and its sub-categories include CR, EG, GI and GA

Applications

Outer auto parts that require higher formability than 340E, such as side outers and fenders

Mechanical Properties

기계적성질의 세부 스펙

Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.
TS	CR/EG	180~	340~	35~
	GI/GA	180~	340~	35~

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390E

390E provides a tensile strength of over 390 MPa and elongation of over 27 percent. Its most common application is automotive parts that require high strength and deep drawability, and its sub-categories include CR, EG, GI and GA.

Applications

Inner and outer auto parts that require high strength and high formability, including members, floors and reinforced A-pillar outers

Mechanical Properties

기계적성질의 세부 스펙

Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.
TS	CR/EG	206~	390~	27~
	GI/GA	206~	390~	27~

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440E

440E provides a tensile strength of over 440 MPa and elongation of over 27 percent. It has the highest strength of all IF HSSs, thus ideal for automotive parts that require high strength, and its sub-categories include CR, EG, GI and GA.

Applications

Inner and outer auto parts that require high strength and high formability, including members, floors, reinforced A-pillar outers and reinforced floor side rear uppers

Mechanical Properties

기계적성질의 세부 스펙

Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.
TS	CR/EG	245~	440~	27~
	GI/GA	245~	440~	27~

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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).

490DP

490DP provides a tensile strength of over 490 MPa, thus ideal for auto structural parts that require high strength. It also suffers no strain aging because it is rigid, with a yield strength of over 270 MPa. Thanks to these properties and the tendency towards weight reduction, the steel is increasingly used for outer auto parts. Those intended for the exterior, in particular, are subject to strict quality assurance practices. Products include CR, EG, GI and GA.

Applications

Automotive structures that require high strength, such as sill side members and reinforcement roof side outers, and inner and outer parts that require dent resistance, including doors

Mechanical Properties

기계적성질의 세부 스펙

Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.
TS	CR/EG	270~380	490~	28~
	GI/GA	270~380	490~	28~

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590DP

590DP provides a tensile strength of over 590 MPa, thus ideal for auto structural parts that require high strength. With the recent tendency towards lightweight cars, we seek ways to apply 590DP having a higher yield strength than 490DP to outer parts. Those intended for the exterior, in particular, are subject to strict quality assurance practices. Products include CR, EG, GI and GA.

Applications

Automotive structures that require high strength, such as sill side members and reinforcement roof side outers; impact members that require impact toughness, such as side sill side panels and underbody reinforcement parts; and outer parts that require dent resistance, such as doors

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

780DP has a tensile strength of over 780 MPa and is commonly used for auto structural parts that require high strength. Its sub-categories include CR, GI and GA.

Applications

Automotive structures that require high strength, such as sill side members and reinforcement roof side outers; impact members that require impact toughness, such as side sill panels and underbody reinforcement parts

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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980DP

980DP has a tensile strength of over 980 MPa, the highest of all cold rolled DP steels. POSCO 980DP is available in three types depending on customer needs: 980DP-H, 980DP-M and 980DP-EL. 980DP-H has high YR (YS/TS) and features a good HER and bending properties. 980DP-M is intended to provide improved welding properties while 980DP-EL is designed to provide higher formability. Products include CR, GI and GA.

Applications

• · 980DP-H is commonly used for automotive parts that require a high HER (hole expansion ratio) and good bending properties, such as seat belts and seat rails.
• · 980DP-M is extensively used for automotive structures and impact members that require high strength and impact toughness.
• · 980DP-EL is commonly used for structural members of motor vehicles (center pillar inner upper) that require relatively high formability.

Mechanical Properties

기계적성질의 세부 스펙

Grade	Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.
980D-M	TS	CR/GI/GA	580~750	980~	9~
980D-H	TS	CR/GI/GA	650~900	980~	8~
980D-EL	TS	CR/GI/GA	580~760	980~	10~

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Grade	Uncoated	Electrogalvanized	Galvanized	Galvannealed
980D-M		-
980D-H		-
980D-EL		-	-	-

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What is TRIP (Transformation Induced Plasticity) Steel?

It is a type of steel designed to provide ultra-high strength and high formability for customers to reduce the weight of their car bodies. It is basically a dual phase alloy consisting of the ferritic matrix, bainite and residual austenite. It often contains a small amount of martensite. With a yield ratio of 0.57 to 0.67, TRIP steel has good formability (elongation), thus ideal for parts that require high formability. High strength TRIP steel is hardly applicable to galvanized steel. This is because it contains Si and other elements that work against plating.

590TRIP

590TRIP provides a tensile strength of over 590 MPa. It features higher elongation than HSLA and DP steels having a tensile strength of 590 MPa. Its products include CR, EG and GA.

Applications

Structural parts of motor vehicles that require high strength and high formability, such as floor side panels

Mechanical Properties

기계적성질의 세부 스펙

Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.
TS	CR/EG	350~	590~	30~
	GI/GA	380~480	590~	27~

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690TRIP

690TRIP provides a tensile strength of over 690 MPa and elongation of over 21 percent.

Applications

Structural parts of motor vehicles that require high strength and high formability, such as members, reinforcement tunnels and tunnel hinges

Mechanical Properties

기계적성질의 세부 스펙

Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.
TS	GI/GA	350~	690~	26~

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780TRIP

780TRIP provides a tensile strength of over 780 MPa and elongation of over 14 percent. They conform to VDA 239-100 CR450Y780T standards.

Applications

Structural parts of motor vehicles that require high strength and high formability for lightweight purposes, such as members, reinforcement tunnels and tunnel hinges

Mechanical Properties

기계적성질의 세부 스펙

Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.
TS	CR	~640	780~	14~

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980TRIP

980TRIP provides a tensile strength of over 980 MPa and elongation of over 21 percent. The steel can be made into sophisticated forms using a cold rolling press. It is intended to take the place of parts that use steel sheets having a tensile strength of 590 MPa. Bainite is properly distributed to provide higher elongation and HER. In addition, carbon and phosphorous content are minimal to improve weldability. Products include CR and GA.

Applications

Structural parts of motor vehicles that require high strength and high formability for lightweight purposes, such as roof side rails, A/B pillar lowers, pillar hinges and side members

Mechanical Properties

기계적성질의 세부 스펙

Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.
TS	CR/EG	600~	980~	21~
	GA	550~	980~	17~

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1180TRIP

1180TRIP provides a tensile strength of over 1180 MPa and elongation of over 14 percent. This steel is intended to take the place of steel made through high-temperature press forming. It has the highest strength of all TRIP steels. Its products include CR, EG and GA.

Applications

Structural parts of motor vehicles that require high strength and high formability for lightweight purposes, such as center pillar uppers, front pillar lowers and seat belts

Mechanical Properties

기계적성질의 세부 스펙

Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.
TS	CR/EG	850~	1180~	14~
	GI/GA	850~	1180~	14~

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980XF-B

It is a type of steel designed to provide ultra-high strength and high formability for customers to reduce the weight of their car bodies. Its tensile strength multiplied by elongation is over 25,000 MPa%. POSCO offers 980PosM_XF, a CR steel of 980 MPa grade. The process to make PosM_XF involves heat treatment at a temperature range where dual phases of ferrite and austenite exist and quick cooling to a tempering temperature. This allows ferrite, martensite and residual austenite to exist at room temperatures. Its fine crystal grains allow the steel to have high yield strength. The existence of residual austenite plays an important role in achieving an elongation of over 25%.

Applications

Structural parts of motor vehicles that require high strength and high formability for lightweight purposes, such as front pillar uppers

Mechanical Properties

기계적성질의 세부 스펙

Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.
TS	CR	600~	980~	25~

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.

950TWIP

950TWIP steel has a tensile strength of over 950 MPa and elongation of over 45 percent as well as better strain hardening than commercial steel. It can be used for parts that require high energy absorption upon impact.

Applications

Impact related parts of motor vehicles that are designed to absorb energy upon impact, such as bumper beams, and automotive parts that require high formability into sophisticated shapes, such as subframes

Mechanical Properties

기계적성질의 세부 스펙

Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.
TS	CR	450	950~	45~

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What is CP (Complexed Phase) Steel?

This steel is intended for customers who require ultra-high strength steel for better vehicle safety. It contains ferrite, bainite, martensite as well as Ti or Nb precipitation. CP steel features single phase (or dual phase) rolling where it is heated and then cooled slowly. Consisting mainly of bainite and martensite, the steel has a high yield ratio and good bending workability.

980CP

980CP provides a yield strength of over 800 MPa and a tensile strength of over 980 MPa. It is intended to provide high YR (YS/TS) is widely used for automotive parts that require good impact protection.

Applications

Structural parts of motor vehicles that require high impact safety, such as sill side panels and underbody reinforcement parts

Mechanical Properties

기계적성질의 세부 스펙

Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.
TS	CR/GI	800~	980~	5~

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1180CP

1180CP provides a yield strength of over 850 MPa and a tensile strength of over 1180 MPa. High yield strength coupled with improved bending workability means that the steel is ideal for form and roll forming. Products include CR, GI and GA.

Applications

Structural parts of motor vehicles that require high impact safety, such as sill side panels

Mechanical Properties

기계적성질의 세부 스펙

Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.
TS	CR	850~	1180~	6~
	GI/GA	825~	1180~	5~

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1180CP-HE

1180CP-HE steel has higher elongation than 1180CP. It is made by adding residual austenite to CP steel containing the matrix of ferrite, bainite and martensite for higher elongation through TRIP effect.

Applications

Structural parts of motor vehicles that require high impact safety, such as sill side panels

Mechanical Properties

기계적성질의 세부 스펙

Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.
TS	CR	850~	1180~	8~
	GA	800~	1180~	8~

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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.

1300MART

1300MART provides a tensile strength of over 1,300 MPa and a yield strength of 1,000 MPa. With high strength and low ductility, it is used for parts that require roll forming. It can also be used for members to prevent deformation of the car body upon impact. Its products include CR and GI.

Applications

Impact members of motor vehicles that require high impact toughness, such as side sill outers and bumper beams

Mechanical Properties

기계적성질의 세부 스펙

Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.
TS	CR	1,000~	1,300~	4~
	GI	1,000~	1,300~	4~

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1470MART

1470MART provides a tensile strength of over 1,470 MPa and a yield strength of 1,050 MPa. It contains more alloy elements than 1300MART for higher impact safety. It can be used for impact members that prevent deformation of the car body upon impact. Products include CR and GI.

Applications

Impact members of motor vehicles that require high impact toughness, such as side sill outers and bumper beams

Mechanical Properties

기계적성질의 세부 스펙

Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.
TS	CR	1,050~	1,470~	5~
	GI	1,050~	1,470~	5~

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What is HPF (Hot Press Forming) Steel?

HPF (hot press forming) process is also called hot stamping, press hardening or die quenching. This process involves forming using steel sheets and a press. Sheets at a high temperature are highly ductile, thus ideal for sophisticated shaped. A sheet heated during forming is cooled quickly within a mold. This allows the steel to have very high strength.

1470HPF

Unlike regular HPF that contains boron to increase strain hardening of steel sheets, POSCO’s cold rolled 1470HPF contains manganese and no chromium. In boron-added steel, boron remains in the form of the bake to maximize quenching. To do this, it is imperative to precipitate N into TiN in the steel. In contrast, POSCO adds N to make the steel remain as bake and increase its yield strength during the baking process after painting. Products include CR and Al-Si.

Applications

Bodies in white of motor vehicles that require highly strong reinforcement, such as A/B pillars and roof cross members

Mechanical Properties

Before heat treatment

기계적성질의 세부 스펙

Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.
Composition	CR/AlSi	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	CR/AlSi	1,000~	1,470~	5~

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2000HPF

2000HPF has more alloy elements than cold rolled 1470HPF steel to maximize yield strength and tensile strength after heat treatment. It has the highest strength of all steels.

Applications

Bodies in white of motor vehicles that require highly strong reinforcement, such as A/B pillars and roof cross members

Mechanical Properties

Before heat treatment

기계적성질의 세부 스펙

Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.
Composition	CR/AlSi	300~	500~	11~

After heat treatment

기계적성질의 세부 스펙

Guaranteed Value	Class	0.2%YS, MPa Spec.	TS, MPa Spec.	El., % Spec.
Composition	CR/AlSi	1,200~	1,800~	4~

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Uncoated	AlSi coated

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