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USA UNS G51200
AISI
American Iron and Steel Institute		 5120
Corresponding Standard ASTM A29/A29M-2012
Standard Specification for General Requirements for Steel Bars, Carbon and Alloy, Hot-Wrought
Classification Alloy Steel
Chemical Element Composition Content (%)
Component C Si ① Mn P S Cr Ni ② Cu ② Mo ② More
Minimum Value 0.17 0.15 0.7 - - 0.7 - - - ③
Maximum Value 0.22 0.35 0.9 0.035 0.04 0.9 0.25 0.35 0.06
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
20Cr
20CrH 		A20202 SCr420 SCr420
SCr420H
SCR420HRCH 		SCr420 5120 G51200 20Cr4 20Cr4 1.7027 18C3 20Cr4 1.7027 20Х 527A20
2 Approximate Comparison Table Structural Alloy Steel
China Japan South Korea United States International Organization for Standardization Germany France European Standard Russia
GB ISC JIS KS ASTM/AISI UNS ISO DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade GOST
20CrMn
20CrMnH 		A22202 SMnC420 SMnC420 5120 G51200 20MnCr5 20MnCr5 1.7147 20MC5 20MnCr5 1.7147 20ХГ
3 Approximate Comparison Table Cold Heading Steel
China United States International Organization for Standardization Russia
GB ISC ASTM/AISI UNS ISO GOST
ML20Cr A20204 5120 G51200 20Cr4E
(B10) 		20Х

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