5140 ML40Cr SCr440 GR8.8 alloy steel round bar1.5140 40cR Scr440 Gr8.8 steel bar Main standard GBJISDINASTM/AISI/SAE40CrSCr4041Cr451402.5140 40cR Scr440 Gr8.8 steel bar chemical compitionCSIMNSPCrNi/Cu0.38-0.430.15-0.350.70-0.900.025 (max)0.025 (max)0.70-0.900.25 (max)3.40Cr 5140 41Cr4 SCr440 steel......



| GB | JIS | DIN | ASTM/AISI/SAE |
| 40Cr | SCr40 | 41Cr4 | 5140 |
| C | SI | MN | S | P | Cr | Ni/Cu |
| 0.38-0.43 | 0.15-0.35 | 0.70-0.90 | 0.025 (max) | 0.025 (max) | 0.70-0.90 | 0.25 (max) |
| Hot rolled round bars | 16mm to 350mm |
| Cold drawn bars | 6mm to 50mm |
| Forged round bars | 200mm-800mm |
| Oxygen | Nitrogen | Hydrogen |
| 20ppm(max) | 90ppm(max) | 2ppm(max) |
| A | B | C | D | |
| MAX | MAX | MAX | MAX | |
| Thin | 2.5 | 2.0 | 0.5 | 0.5 |
| Thick | 1.5 | 1.0 | 1.0 | 1.0 |









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