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Grade SCM418
Corresponding Standard JIS G 4105-1979
Classification Alloy Steel
SCM418 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Cu Mo
Minimum Value 0.16 0.15 0.6 - - 0.9 - - 0.15
Maximum Value 0.21 0.35 0.85 0.03 0.03 1.2 0.25 0.3 0.25
SCM418 Mechanical Properties
Heat Treatment or Condition
Tensile Strength
σb
Mpa 		Elongation or Extension Rate
δ
% 		Reduction of Area
ψ
% 		Hardness
HBW 		Impact Energy Absorption
KV2
J
Double Quenching and Tempering ≥883 ≥15 ≥40 248~331 ≥69
1 Approximate Comparison Table structural alloy steel
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France European Standard Russia United Kingdom
GB ISC CNS JIS KS ASTM/AISI UNS ISO DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade GOST BS EN/BS
20CrMo
20CrMoH 		A30202 SCM420 SCM420
SCM418
SCM418H 		SCM420 4118
4120 		G41180 18CrMo4 20CrMo5 1.7264 18CD4 18CrMo4 1.7243 20ХМ CDS12
2 Approximate Comparison Table structural alloy steel
Japan International Organization for Standardization Germany France European Standard Russia United Kingdom
JIS ISO DIN EN/DIN NF EN/NF EN Numerical Grade GOST BS EN/BS
SCM418 18CrMo4 18CrMo4 18CD4
18CrMo4 		18CrMo4 1.7243 20KHM 708H20
708M20
SCM418 Corresponding Standards(Same grade name, different standards)
1 JIS G 4053-2003
SCM418
2 JIS G 4105-1979
SCM418
3 JIS G 4053-2016
SCM418

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