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Grade 25
Corresponding Standard GB /T 12228-2006
General purpose industrial valves - Specification of carbon steel forgings
Classification Carbon Steel
25 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Cu
Minimum Value 0.22 0.17 0.5 - - - - -
Maximum Value 0.29 0.37 0.8 0.035 0.035 0.25 0.3 0.25
25 Mechanical Properties
Heat Treatment or Condition
Tensile Strength
σb
Mpa 		Yield Point
σs
Mpa 		Elongation or Extension Rate
δ
% 		Reduction of Area
ψ
% 		Hardness
HBW 		Impact Energy Absorption
KV2
J 		Bending Strength σw
Mpa
Annealing, Normalizing, or Normalizing + Tempering ≥450 ≥275 ≥23 ≥50 ≤187 71 ≤170
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 Japan International Organization for Standardization
GB JIS ISO
25 S25C C25
3 Approximate Comparison Table
China Japan International Organization for Standardization European Standard
GB JIS ISO EN Numerical Grade
25 S25C C25E C22E 1.1151
4 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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