Steel 30CD12 - 1.8515 - 30CrMo12 - 31CrMo12 - FE-PL1501
The 30CD12 steel (or 31CrMo12) is an alloy designed for nitriding. After treatment, it features a hard surface, reaching up to 800 HV, while maintaining good toughness at its core. These properties make it wear-resistant and ensure the durability of the parts in which it is used. Its chemical composition (chromium, carbon, and nickel) along with the various possible heat treatments (quenching, tempering) provide remarkable mechanical properties and contribute to its popularity. In addition to its wear resistance, 30CD12 boasts excellent tensile strength, which is why it is used for manufacturing gears and shafts, especially in the aerospace industry, where components are subjected to high stress.
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Chemical composition of 30CD12
The variations in its chemical composition for aerospace.
| % | C Carbon | Cr Chromium | Mn Manganese | Mo Molybdenum | Ni Nickel | P Phosphorus | S Sulfur | Si Silicon |
|---|---|---|---|---|---|---|---|---|
| Min. | 0.28 | 2.80 | 0.40 | 0.30 | <0.00 | <0.00 | <0.00 | 0.10 |
| Max. | 0.35 | 3.30 | 0.70 | 0.50 | 0.30 | 0.025 | 0.020 | 0.40 |
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Key properties
The most remarkable properties of this steel alloy
Ductility
≥11%
Tensile Strength
930-1270 MPa
Impact Toughness
≥800 kJ/m²
Yield Strength
≥780 MPa
How 30CD12 is used in aerospace
The practical applications of this steel in aircraft construction.
Shafts
Used in components such as transmission and turbine shafts, 30CD12 steel offers excellent resistance to torsion and low-cycle fatigue.
Fasteners
Steel fasteners, such as retaining rings, provide solid holding power for parts exposed to repeated shocks and vibrations. The wear resistance and dimensional stability of 30CD12 after heat treatment make it a suitable alloy to ensure durable fastenings.
Gears
Gears made from 30CD12 benefit from a hard, wear-resistant surface. Subjected to heavy loads and fatigue cycles (due to variations in operating speed, for example), these parts enjoy reduced maintenance costs and increased lifespan thanks to this alloy.
