SS 29 40 Structural and constructional steels
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SS 29 40 Chemical Composition
SS 142940: 1986 / Nitriding steel - SS-steel 29 40
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SS 29 40 Physical Properties
Temperature
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SS 29 40 Heat Treatments
- Normalization: 870-920°C. Free cooling.
Relaxation annealing: 525 - 650°C. For hardened condition 25 - 50°C lower temperature than tempering temperature (but above the nitriding temperature). For soft annealed condition 600 - 650°C. Holding time 0.5 - 2 h. Cooling with the oven to 450°C, then free cooling.
Soft annealing: 700 - 730°C. Holding time 2 h. Cooling max 15°C / h to 600°C, then free cooling.
Hardening: Cooling in oil from 880 - 920°C. Tempering should take place immediately after cooling. Tempering temperature 570 - 650°C and holding time are adapted to the dimension and desired strength.
Nitriding: 500 - 520°C. The holding time is adjusted to the desired nitriding depth. The surface hardness after nitriding becomes HV approx. 1000. Long-term nitration (60 h) does not affect the core strength if the tempering temperature at the hardening has been at least 570°C.
SS 29 40 Mechanical Properties
Temperature
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SS 29 40 International Equivalent Materials
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Equivalence categories reflect chemical-composition and mechanical-property comparison — always verify suitability against the governing specification for your application.
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- 203Cross References
- 8Composition
- 16Mechanical Properties
- 3Physical Properties
- 2Heat Treatment
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