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Grade Grade No. 5120
USA UNS G51200
Corresponding Standard ASTM A 752-2004(R2010)
Standard Specification for General Requirements for Wire Rods and Coarse Round Wire, Alloy Steel
Classification Alloy Steel
Grade No. 5120 Chemical Element Composition Content (%)
Component C Si Mn P S Cr
Minimum Value 0.17 0.15 0.7 - - 0.7
Maximum Value 0.22 0.3 0.9 0.035 0.04 0.9
* Small quantities of certain elements, which are not specified or required, are present in alloy steels. These elements are considered as incidental and may be present to the following maximum amounts: copper, 0.35 %, nickel. 0.25 %, chromium, 0.20 %. molybdenum, 0.06 %.
* Standard alloy steels can be produced with a lead range of 0.15 to 0.35 %. Such steels are identified by inserting the letter “ L” between the second and third numerals of the Grade number, for example, 41L40. Lead is reported only as a range of 0.15 to 0.35 % since it is added to the mold as the steel is poured.
Grade No. 5120 Mechanical Properties
Heat Treatment or Condition
Tensile Strength
σb
Mpa
Annealed ≤570
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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