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ASTM8620H Bearing Steel

ASTM8620H Bearing Steel

ASTM8620H Bearing Steel
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ASTM8620H Bearing Steel



Material Name


Material Name: 8620H Bearing Steel
Execution standard: ASTM A534-04

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 0.15～0.35 0.60～0.95 Below 0.015 Below 0.025
 0.35~0.65 0.35~0.75 Below 0.30 0.15~0.25

Mechanical Property



Tensile strength
σb (MPa)

Elongation
δ 5 (％)
Reduction of crosssection area
ψ (％)

Pounding toughness value
                    αkv (J/cm2)                    

Specimen size
Above 1176 Above 9 Above 45
 Above 78 15mm


specification of heat treatment and metallurgical structure


Specification of heat treatment : hardening, 880±20℃ for the first time, 790±20℃ for the second time, oil cooling, tempering, 150～200℃, air cooling.
Metallurgical Structure: martensite

Delivery State


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