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Grade S25C
Corresponding Standard JIS G 4051-2023
Carbon Steels for Machine Structural Use
Classification Carbon Steel
S25C Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Cu More
Minimum Value 0.22 0.15 0.3 - - - - - Ni+Cr≤0.35
Maximum Value 0.28 0.35 0.6 0.03 0.035 0.2 0.2 0.3
① Alloy elements not given in thistable shall not be intentionally added for other purposes than finishing the heat.
② The limit may be 0.30% or under upon agreement between the purchaser and the manufacturer.
③ The upper limit of Ni+Cr may be 0.40% or under for S09CK,S15CK and S20CK and 0.45% or under for other grades, upon agreement between the purchaser and the manufacturer.
1 Approximate Comparison Table High-Quality Carbon 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/AISI UNS ISO DIN EN/DIN W-Nr. NF EN/NF GOST BS EN/BS
25 U20252 S25C S25C SM25C 1025 G10250 C25E4 C25E
Ck25 		1.1158 C25E
XC25 		25 C25E
070M26
2 Approximate Comparison Table Carbon Structural Steel and Engineering Steel
China Japan International Organization for Standardization
GB JIS ISO
25 S25C C25
3 Approximate Comparison Table Non-Alloy Steel for Quenching and Tempering
China Japan International Organization for Standardization European Standard
GB JIS ISO EN Numerical Grade
25 S25C C25E C22E 1.1151
4 Approximate Comparison Table Non-Alloy Steel for Quenching and Tempering
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
S25C C25E4 Ck25 XC25 C25E 1.1158 25 070M26
5 Approximate Comparison Table High-Quality Carbon Structural Steel
China Japan United States International Organization for Standardization France Russia United Kingdom
GB JIS ASTM/AISI ISO NF EN/NF GOST BS EN/BS
GB/T 699-1999
25 		S25C 1025 ISO 630-1:1987
C25
C25E4
C25M2 		C25
XC25 		25 060A25
070A26
S25C Corresponding Standards(Same grade name, different standards)
1 JIS G 4051-2005
S25C
2 JIS G 4051-2016
S25C
3 Q/BQB 517-2018
S25C
4 Q/BQB 615-2009
S25C
5 Q/BQB 615-2018
S25C
6 JIS G 4051-2023
S25C

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