ASTM A193 Grade B7/B7M is alloy steel, GB 42CrMo AISI 4040/4142 quenched and tempered.
Chemical composition: C: 0.37 ~0.49; Si: 0.15~0.35; Mn：0.65～1.10; S: ≤0.035; P: ≤0.035; Cr：0.75～1.20; Mo: 0.15～0.25
Thread sizes: M16~M56
Thread screw: Cold thread
Surface Treatment: Oil, Grease, Dacromet, Zinc coating,Paint, tape, fabric, Water-proof Paper, Box.
Place of Origin: China
Equivalent grades conversion:
| Standard | Grade |
| GB | 42CrMo |
| AISI | 4140 |
| ГOCT | 38XM |
| BS | 708M40, 708A42, 709M40 |
| NF | 40CD4, 42CD4 |
| DIN | 41CrMo4, 42CrMo4, 1.7225 |
| JIS | SCM4 |
| ISO | 683, 1 3 |
| SAE | 4140H, 4140RH |
Mechanical composition:
Tensile strength: min 125 ksi
Yield strength : min 105 ksi
Elongation rate: min 16%
Reduction rate: min 50%
Impact energy: akv min 63J
Hardness: C35
Formula reference:
Round bar weight KG = length(m) x radius(mm)² x 0.00617
LT Group provide heat-treatment, cold thread, lab services according to customer’s technical requirements. Please send properties requriements to [email protected]. We will give positive response within one working day.
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Post time: Aug-03-2020