15 - GB /T 17107-1997

Grade	15
Corresponding Standard	GB /T 17107-1997 Structural Steel Grades And Mechanical Property For Forgings
Classification	Carbon Steel

15 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu
Minimum Value	0.12	0.17	0.35	-	-	-	-	-
Maximum Value	0.19	0.37	0.65	0.035	0.035	0.25	0.25	0.25

• High-quality steel——P≤0.035；S≤0.035；Cu≤0.3；Cr≤0.3；Ni≤0.3
• Extra-quality steel （Suffix A）——P≤0.025；S≤0.025；Cu≤0.25；Cr≤0.3；Ni≤0.3
• Special High-Quality Steel (Suffix E)——P≤0.025；S≤0.015；Cu≤0.25；Cr≤0.3；Ni≤0.3

• Cu is not more than 0.3% when smelting scrap steel

15 Mechanical Properties

diameter or thickness d mm	Mark	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
d≤100	Sample Direction: Longitudinal	Normalizing + tempering	≥320	≥195	≥27	≥55	97~143	≥47
100＜d≤300	Sample Direction: Longitudinal	Normalizing + tempering	≥310	≥165	≥25	≥50	97~143	≥47
300＜d≤500	Sample Direction: Longitudinal	Normalizing + tempering	≥300	≥145	≥24	≥45	97~143	≥43

• The forgings must be inspected for mechanical properties after performance heat treatment and before any surface treatment.
• After the samples are removed, no heat treatments that affect the mechanical properties or any processing that influences the test results shall be conducted.
• Mechanical property testing primarily evaluates the material\'s tensile strength, impact resistance, and hardness. When conducting tensile, impact, and hardness tests simultaneously, the hardness value is for reference only. Alternatively, one may choose to perform only one of the tensile, impact, or hardness tests.

1 Approximate Comparison Table High-Quality Carbon Structural Steel

China

Taiwan, China

Japan

South Korea

United States

Germany

France

Russia

Sweden

United Kingdom

ISC

CNS

JIS

ASTM/AISI

UNS

DIN EN/DIN

W-Nr.

NF EN/NF

GOST

BS EN/BS

U20152

S15C

SM15C

1015

G10150

C15
Ck15

1.0401
1.1141

C12
XC15

1350
1370

040A15
080M15

2 Approximate Comparison Table High-Quality Carbon Structural Steel

China	Germany	France	European Standard
GB	DIN EN/DIN	NF EN/NF	EN	Numerical Grade
15	C15 Ck15	XC12	C15	1.0401

3 Approximate Comparison Table High-Quality Carbon Structural Steel

China	Japan	United States	International Organization for Standardization	Germany		France	European Standard		Russia	Sweden	United Kingdom
GB	JIS	ASTM	ISO	DIN EN/DIN	W-Nr.	NF EN/NF	EN	Numerical Grade	GOST	SS	BS EN/BS
15	S15C	Gr.1015 Gr.1016	C15E4	C15 Ck15	1.1141	C18RR XC12 XC15	C15E	1.1141	15	1370	040A15 080M15 CS17

4 Approximate Comparison Table High-Quality Carbon Structural Steel

China	Japan	United States	France	Russia	United Kingdom
GB	JIS	ASTM/AISI	NF EN/NF	GOST	BS EN/BS
15	S15C S15CK	1015	C15 XC15	15	040A15 050A15 060A15

5 Approximate Comparison Table High-Quality Carbon Structural Steel

China	Japan	South Korea	United States	International Organization for Standardization	Germany		France	Russia	United Kingdom
GB	JIS	KS	ASTM/AISI	ISO	DIN EN/DIN	W-Nr.	NF EN/NF	GOST	BS EN/BS
15	S15C	STKM12B	1015	C15E4	C15C	1.0234	C15C	15	C15C

15 Corresponding Standards(Same grade name, different standards)

1	GB /T 699-1999
	15 U20152
2	ISO 4955-2005
	(15) X12CrNi23-13
3	GB /T 699-2015
	15 U20152
4	GOST 1050-1988
	15
5	ISO 683-13-1986
	15
6	GB /T 17107-1997
	15
7	GB /T 3078-2019
	15 15#
8	GB /T 710-2008
	15 U20152
9	GB /T 711-2017
	15 15#
10	GB /T 13237-2013
	15
11	GB 3522-1983
	15

Note: The data is for reference only! If you have any questions, please fill out "I want to correct it"!