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| Brand | Specification range（mm） | USE | |
Thickness | Breadth | ||
B320LW | 2.0～3.0 | ≤1250 | Steel for automobile wheels |
B360LW | 2.0～3.0 | ≤1200 | |
B440QZ | 1.5～2.5 | 900～1400 | Steel for automobile drive shafts |
B350JL | 0.80～2.0 | 900～1300 | Car clutch |
St12G | 2.0 | ≤1250 | Car bracket |
St14J | 1.75 | ≤900 | Car support bracket |
BMCP84 | 1.5～3.0 | 900～1350 | Automotive clutch friction plate steel |
Stl2Q | 2.0～3.5 | 900～1300 | Steel for car chassis |
| Brand | Chemical composition (Melting analysis) % (mass fraction) | |||||
C | Si | Mn | P | S | Alt | |
B320LW | ≤0.12 | ≤0.05 | 0.6～1.0 | ≤0.030 | ≤0.025 | ≥0.020 |
B360LW | ≤0.12 | ≤0.30 | 0.8～1.20 | ≤0.030 | ≤0.025 | ≥0.020 |
B440QZ | 0.17～0.27 | 0.15～0.37 | 0.4～0.7 | ≤0.035 | ≤0.035 | - |
BMCP84 | 0.14～0.25 | - | - | ≤0.04 | ≤0.05 | - |
B350JL | 0.07～0.13 | ≤0.12 | 0.30～0.60 | ≤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 | ≤0.05 | 0.40～1.00 | ≤0.030 | ≤0.025 | ≥0.020 |
Stl2Q1 | ≤0.12 | ≤0.30 | 0.60～1.20 | ≤0.030 | ≤0.025 | ≥0.020 |
| Brand | Tensile test a, b | 180° bending test（b≥20mm）c (Curvature diameter) | Hardness value d (HRB) | ||
Yield strength/MPa | Tensile strength/MPa | Elongation 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 | ≤280 | 295～430 | 28 | － | － |
St14J | 180～220 | 280～370 | 39 | － | － |
Stl2Q | 215～285 | 320～390 | 32 | － | － |
Stl2Q1 | 245～300 | 370～430 | 28 | 0.5a | － |
a RP0.2 is used when there is no obvious yield, otherwise ReL is used. | |||||
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