JIS G4051 S20C steel standard specifies the carbon steels for machine structural use manufactured by hot forming,such as hot rolling or hot forging,ordinarily to be used after further process of forging,cutting and heat treatment.
JIS G4051 S20C material chemical composition by %,maximum
Grade |
C | Si | Mn | P | S |
| JIS G4051 S20C | 0.18-0.23 | 0.15-0.35 | 0.3-0.6 | ≤0.030 | ≤0.035 |
JIS G4051 S20C steel mechanical properties:
Grade |
Delivery State | T.S. N/mm2 Min |
Y.S. N/mm2 Min |
A,% Min |
Z,% Min |
Hardness, (annealing or tempering) HB,max |
Forging ratio | Grain Size (level) |
Nonmetal ratio |
| JIS G4051 S20C | Hot rolled, forged, or heat treatment | 410 | 245 | 25 | 55 | 156 | ≥ 4:1 | ≥ 6 | ≤ 2.0 |
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