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Home Material GOST 4543-1971
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Grade 20ХМ
Corresponding Standard GOST 4543-1971
Alloyed Construction Steel Specifications
Classification Alloy Steel
Properties High Hardenability
20ХМ Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Cu Mo
Minimum Value 0.15 0.17 0.4 - - 0.8 - - 0.15
Maximum Value 0.25 0.37 0.7 0.035 0.035 1.1 0.3 0.3 0.25
• The letter A at the end of the grade stands for “high quality steel”. Character III means “Extra high quality steel”. For example, quality steel -30XΓC; High quality steel -30XΓCA; Extra high quality steel -30X ΓC-Ⅲ and 30XΓCA-Ⅲ.
20ХМ Mechanical Properties
Heat Treatment or Condition
Tensile Strength
σb
Mpa 		Yield Point
σs
Mpa 		Elongation or Extension Rate
δ
% 		Reduction of Area
ψ
% 		Impact Energy Absorption
KV2
J
Sample d=15 Quenching 880°C water or oil cooling, Tempering 500°C air cooling ≥780 ≥590 ≥12 ≥50 Impact energy per unit area
KCU: ≥88J/cm²
d≥5 Annealing Indentation diameter ≥ 4.5mm
≤179
• d=circle diameter or quadrate side，unit mm
• Mechanical properties suitable for diameter or thickness less than or equal to 80mm, other sizes of mechanical properties requirements see the standard original.
• The impact test shall comply with GOST 9454-78.
• If the yield phenomenon is not obvious and the yield stress σT(i.e., σs) cannot be determined, the yield limit σ0.2(i.e., Rp0.2) is allowed.
• Allowable deviation of heat treatment temperature: quenching ±15°C; Low temperature tempering ±30°C; High temperature tempering ±50°C
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 Hardenability Guaranteed Structural Steel
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France Russia United Kingdom
GB ISC CNS JIS KS ASTM UNS ISO DIN EN/DIN W-Nr. NF EN/NF GOST BS EN/BS
20CrMnH A30205 SCM420H SCM420H SCM420H 4118H H41180 18CrMo4H 18CrMo4 1.7243 18CrMo4
(20CD4) 		20ХМ 18CrMo4
3 Approximate Comparison Table Hardenability Guaranteed Structural Steel
China Taiwan, China Japan South Korea International Organization for Standardization Germany France European Standard Russia United Kingdom
GB ISC CNS JIS KS ISO DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade GOST BS EN/BS
22CrMoH A30225 SCM822H SCM822H SCM822H 22CrMoS3-5 20CrMo5 1.7264 (40CD4) 22CrMoS3-5 1.7333 ≈20ХМ 20CrMo5

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