45 - GB /T 17107-1997

Grade	45
Corresponding Standard	GB /T 17107-1997 Structural Steel Grades And Mechanical Property For Forgings
Classification	Carbon Steel

45 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu
Minimum Value	0.42	0.17	0.5	-	-	-	-	-
Maximum Value	0.5	0.37	0.8	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

45 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 or normalizing + tempering	≥590	≥295	≥15	≥38	170~217	≥23
100＜d≤300	Sample Direction: Longitudinal	Normalizing or normalizing + tempering	≥570	≥285	≥15	≥35	163~217	≥19
300＜d≤500	Sample Direction: Longitudinal	Normalizing or normalizing + tempering	≥550	≥275	≥14	≥32	163~217	≥19
500＜d≤1000	Sample Direction: Longitudinal	Normalizing or normalizing + tempering	≥530	≥265	≥13	≥30	156~217	≥15
d≤100	Sample Direction: Longitudinal	Tempering	≥630	≥370	≥17	≥40	207~302	≥31
100＜d≤250	Sample Direction: Longitudinal	Tempering	≥590	≥345	≥18	≥35	197~286	≥31
250＜d≤500	Sample Direction: Longitudinal	Tempering	≥590	≥345	≥17	-	187~255	-
100＜d≤300	Sample Direction: tangential	Normalizing + tempering	≥540	≥275	≥10	≥25	-	≥16
300＜d≤500	Sample Direction: tangential	Normalizing + tempering	≥520	≥265	≥10	≥23	-	≥16
500＜d≤750	Sample Direction: tangential	Normalizing + tempering	≥500	≥255	≥9	≥21	-	≥12
750＜d≤1000	Sample Direction: tangential	Normalizing + tempering	≥480	≥245	≥8	≥20	-	≥12

• 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

International Organization for Standardization

Germany

France

Russia

Sweden

United Kingdom

ISC

CNS

JIS

ASTM/AISI

UNS

ISO

DIN EN/DIN

W-Nr.

NF EN/NF

GOST

BS EN/BS

U20452

S45C

SM45C

1045

G10450

C45E4

C45E
Ck45

1.1191

C45E
XC48

1660

C45E
080M46

2 Approximate Comparison Table Carbon Structural Steel and Engineering Steel

China	Japan	International Organization for Standardization	European Standard
GB	JIS	ISO	EN	Numerical Grade
45	S45C	C45	C45	1.0503

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
45	S45C	C45E	C45E	1.1191

4 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	NF EN/NF	EN	Numerical Grade	GOST	SS	BS EN/BS
45	S45C	1042 1045 Gr.1043	C45	C45	AF65C45 C45	C45	1.0503	45	1650	070M46 50HS

5 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	NF EN/NF	EN	Numerical Grade	GOST	SS	BS EN/BS
45H 45	S45C	1045	C45E4	Ck45	XC45 XC48H1	C45E	1.1191	45	1672	080M46 CFS8

6 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 45	S45C	1045	ISO 630-1:1987 C45 C45E4 C45M2	C45 XC45	45	060A42 060A47

7 Approximate Comparison Table High-Quality Carbon Structural Steel

China	European Standard
GB	EN	Numerical Grade
45	C45R	1.1201

8 Approximate Comparison Table High-Quality Carbon Structural Steel

China	Germany
GB	DIN EN/DIN
45	CF45

45 Corresponding Standards(Same grade name, different standards)

1	GB /T 699-1999
	45 U20452 45#
2	GB /T 699-2015
	45 U20452 45#
3	GOST 1050-1988
	45
4	GB /T 17107-1997
	45
5	NB /T 20008.12-2010
	45
6	Q/BQB 517-2018
	45
7	GB /T 3078-2019
	45 45#
8	GB /T 710-2008
	45 U20452 45#
9	GB /T 711-2017
	45 45#
10	HB /Z 136-2000
	45
11	DL /T 439-2018
	45
12	GB /T 41157.2-2022
	45 45
13	GB /T 13237-2013
	45
14	JB /T 6908-2020
	45 U20452
15	GB 3522-1983
	45

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