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SNCM420 Bearing Steel

SNCM420 Bearing Steel

SNCM420 Bearing Steel
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SNCM420 Bearing Steel



Material Name


Material Name: SNCM420 Bearing Steel

Characteristics and scope of application



It is a kind of commonly used alloy carburizing steel, after carburizing treatment, the surface has a very high hardness, wear resistance and contact fatigue strength, at the same time, the heart part can also retains a good toughness and withstand high impact load, mainly used for rail bearings, such as impact resistant and wear-resistant parts.



Chemical Composition 


C Si Mn S P Cr Ni Cu Mo
0.17～0.23 0.15～0.40 0.40~0.70 Below 0.030 Below 0.030
 0.35~0.65 1.60~2.00 Below 0.30 0.20~0.30

 Mechanical Property


Tensile strength
σb (MPa)
Elongation
δ 5 (％)
reduction of crosssection area 
ψ (％) 		pounding toughness value
αkv (J/cm2) 		specimen size 
Above 980 Above 13 Above 45
 Above 78(8)
 25mm


specification of heat treatment and metallurgical structure

 
Specification of heat treatment : hardening, 880±20℃ for the first time, 800±20℃ for the second time, oil cooling, tempering, 150～200℃, air cooling.

Delivery State


Hot rolled or forged steel in hot rolled (forging) or annealing state of delivery. Cold drawn steel in annealing state of delivery.