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Sep 18, 2023

Cold-rolled steel sheets and strips for auto parts

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Grade of steel plate and steel strip, available specifications, usesBrandSpecification range(mm)USEThicknessBreadthB320LW2.0~3.0≤1250Steel for automobile wheelsB360LW2.0~3.0≤1200B440QZ1.5~2.5900~1400Steel for automobile drive shaftsB350JL0.80~2.0900~1300Car clutchSt12G2.0≤1250Car bracketS

Grade of steel plate and steel strip, available specifications, uses


Brand

Specification range(mm)

USE

Thickness

Breadth

B320LW

2.0~3.0

≤1250

Steel for automobile wheels

B360LW

2.0~3.0

≤1200

B440QZ

1.5~2.5900~1400Steel for automobile drive shafts

B350JL

0.80~2.0900~1300Car clutch

St12G

2.0

≤1250

Car bracket

St14J

1.75≤900Car support bracket

BMCP84

1.5~3.0900~1350Automotive clutch friction plate steel

Stl2Q

2.0~3.5900~1300Steel for car chassis



Chemical composition of steel


Brand

Chemical composition (Melting analysis) % (mass fraction)

C

SiMnPSAlt

B320LW

≤0.12≤0.050.6~1.0≤0.030≤0.025≥0.020

B360LW

≤0.12≤0.300.8~1.20≤0.030≤0.025≥0.020

B440QZ

0.17~0.270.15~0.370.4~0.7≤0.035≤0.035-

BMCP84

0.14~0.25

-

-

≤0.04

≤0.05

-

B350JL

0.07~0.13≤0.120.30~0.60≤0.035≤0.035-

St12G

0.07~0.14-0.35~0.65≤0.035≤0.035-

St14J

≤0.08-≤0.40≤0.02≤0.03≥0.025

Stl2Q

≤0.10≤0.050.40~1.00≤0.030≤0.025≥0.020

Stl2Q1

≤0.12

≤0.30

0.60~1.20

≤0.030

≤0.025

≥0.020


Mechanical property


Brand

Tensile test a, b

180° bending test(b≥20mm)c (Curvature diameter)Hardness value d (HRB)

Yield strength/MPa

Tensile strength/MPaElongation after breaking A80mm % No less than

B320LW

≥210

320~410

28

0a

B360LW

≥215

360~450

26

0a

B440QZ

≥280

440~540

15

1a

BMCP84

≥84

B350JL

250~350

350~500

20

1a

St12G

≤280295~43028

St14J

180~220

280~370

39

Stl2Q

215~285320~39032

Stl2Q1

245~300370~430280.5a

a RP0.2 is used when there is no obvious yield, otherwise ReL is used.
Sample b is sample P6 in GB/T 228, and the direction of the sample is transverse.
c a indicates the thickness of the sample, and the direction of the sample is longitudinal.
d hardness is the average of the three tests.


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