25 - GB /T 12228-2006

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 σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %	Hardness HBW	Impact Energy Absorption KV2 J	Bending Strength σ_w Mpa
Annealing, Normalizing, or Normalizing + Tempering	≥450	≥275	≥23	≥50	≤187	71	≤170

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

ISC

CNS

JIS

ASTM/AISI

UNS

ISO

DIN EN/DIN

W-Nr.

NF EN/NF

GOST

BS EN/BS

U20252

S25C

SM25C

1025

G10250

C25E4

C25E
Ck25

1.1158

C25E
XC25

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 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

25 Corresponding Standards(Same grade name, different standards)

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