ASTM A193 Grade B7/B7M is alloy steel, 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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Achieving the ISO 9001:2008 Certification is just one example of our Products’ dedication to quality and continuous improvement. Each employee is responsible for understanding company expectations and adhering to the procedures of our Quality Management System.
Our Products ensures customers receive the material ordered with accurate supporting paperwork. Customers can count on proper documentation, on-time performance and effective follow-up.
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We will continually improves and expands the quantity and quality of our product which exactly meet customers need. We do whatever it takes to make our clients happy.
We will develop long-term commercial and technical partnerships with customers. And we are committed to continual quality improvement of all internal processes. The success of our quality program is affirmed by our strong customer retention rate.
