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ASTM A193 B7
42CrMo4, 1.7225
42 CD4
708M40T
709M40
Alloy Steel/ Stainless Steel
Base Element Fe(Iron)
| Element | Amount | (Max/Min) |
|---|---|---|
| C(Carbon) | 0.37 to 0.49% | |
| Cr(Chromium) | 0.75 to 1.2% | |
| Mn(Manganese) | 0.65 to 1.1% | |
| P(phosphorus) | 0.035% | (maximum) |
| S(Sulphur) | 0.04% | (maximum) |
| Si(Silicon) | 0.15 to 0.35% | (maximum) |
| Mechanical Property | Statistic | (Max/Min) |
|---|---|---|
| Ultimate Tensile Strength (UTS) | 860 MPa | (minimum) |
| 0.2% Proof Stress | 720 MPa | (minimum) |
| Elongtion | 16% | (minimum) |
| Hardness (Brinell) | A4D 321 HB | (maximum) |
| Hardness (Rockwell C) | 35 HRC | (maximum) |
Heat Treatment; Minimum tempering temperature: 593 degs C.
Bolting for pressure vessels, valves, flanges and fittings for high temperature or high pressure services, or other special purpose applications.
