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Grade 25
Corresponding Standard GOST 1050-1988
SIZED BARS MADE OF HIGH-QUALITY STRUCTURAL CARBON STEEL WITH A SPECIAL SURFACE FINISH
Classification Carbon Steel
Properties Weldability Carburizing Ability
25 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Cu As
Minimum Value 0.22 0.17 0.5 - - - - - -
Maximum Value 0.3 0.37 0.8 0.035 0.04 0.25 0.3 0.3 0.08
① Identification numbers for steels (depending on degree of deoxidation) shall be used: kn is for rimmed steel; nc is for semi-killed steel; and identification numbers without letters are for killed steels.
②The nitrogen fraction of total mass in basic oxygen steel shall not exceed 0.006 % for light-gage rolled products and strips and 0.008 % for other types of rolled products.
25 Mechanical Properties
product Heat Treatment or Condition
Tensile Strength
σb
Mpa 		Specified Plastic Yield Strength
Rp0.2
Mpa 		Elongation or Extension Rate
δ
% 		Reduction of Area
ψ
% 		Impact Energy Absorption
KV2
J
Rolled product ≥450 ≥275 ≥23 ≥50
Rolled product Hard-worked ≥540 ≥7 ≥40
Rolled product Annealed or high-temperature tempered ≥410 ≥19 ≥50
Rolled product Hardening+temper KCU: ≥88J/cm2
1 Approximate Comparison Table
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
China Taiwan, China Japan South Korea United States France Russia
GB ISC CNS JIS KS ASTM/AISI UNS NF EN/NF GOST
ML25 U40252 SWRCH20K SWRCH20K SWRCH20K 1025 G10250 XC25
FR28 		25
3 Approximate Comparison Table
International Organization for Standardization Germany European Standard Russia
ISO DIN EN/DIN EN Numerical Grade GOST
C25 C25 C25 1.0406 25
4 Approximate Comparison Table
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
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
25 Corresponding Standards(Same grade name, different standards)
1 GB /T 699-1999
25 U20252 25#
2 GB /T 699-2015
25 U20252
3 GOST 1050-1988
25
4 GB /T 17107-1997
25
5 GB /T 3078-2019
25 25#
6 GB /T 710-2008
25 U20252 25#
7 GB /T 711-2017
25 25#
8 HB /Z 136-2000
25
9 NB /T 47008-2017
25
10 GB /T 13237-2013
25
11 GB /T 12228-2006
25
12 GB 3522-1983
25

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