Chrome-molybdenum steel with aluminium for nitriding. After hardening the core becomes very strong – ca. 1,000 MPa resistance – and very resistant to corrosion and high temperatures. Heat & surface treatment processing enables obtaining surface hardness of more than 900 HV, which makes it well-suited for moving parts and parts exposed to friction.
Production of structural elements of high surface hardness. For parts exposed to friction, such as cylinders, bushings, camshafts, extruders, straighteners.
Chemical composition
| Element | C | Si | Mn | P | S | Cr | Mo | Al |
| min | 0.38 | max | 0.40 | max | max | 1.50 | 0.20 | 0.80 |
| max | 0.45 | 0.40 | 0.70 | 0.025 | 0.035 | 1.80 | 0.35 | 1.20 |
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Equivalents
| Wr.Nr. | PN | EN | GOST | AISI |
| 1.8509 | 38HMJ | 41CrAlMo7-10 | 38Х2МЮА | 6431 |
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