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Grade 45
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
45 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Cu As
Minimum Value 0.42 0.17 0.5 - - - - - -
Maximum Value 0.5 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.
45 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 ≥600 ≥355 ≥16 ≥40
Rolled product Hard-worked ≥640 ≥6 ≥30
Rolled product Annealed or high-temperature tempered ≥540 ≥13 ≥40
Sample Hardening+temper KCU: ≥49J/cm2
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
GB ISC CNS JIS KS ASTM/AISI UNS ISO DIN EN/DIN W-Nr. NF EN/NF GOST SS BS EN/BS
45 U20452 S45C S45C SM45C 1045 G10450 C45E4 C45E
Ck45 		1.1191 C45E
XC48 		45 1660 C45E
080M46
2 Approximate Comparison Table Hardenability Guaranteed Structural Steel
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France Russia Sweden United Kingdom
GB ISC CNS JIS KS ASTM UNS ISO DIN EN/DIN W-Nr. NF EN/NF GOST SS BS EN/BS
45H A59455 S45C S45C SM45C 4045H H10450 C45E4H C45E4 1.1191 2C45H
(XC45) 		45 1672 2C45H
(080A42)
3 Approximate Comparison Table Cold Heading Steel
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France Russia
GB ISC CNS JIS KS ASTM/AISI UNS ISO DIN EN/DIN W-Nr. NF EN/NF GOST
ML45 U40452 SWRCH45K SWRCH45K SWRCH45K 1044 G10440 CE45E4
(C6) 		Cq45
(C45C) 		1.1192 XC45 45
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 Steel for Cold Heading and Cold Extrusion
Germany European Standard Russia
DIN EN/DIN EN Numerical Grade GOST
Cq45 C45EC 1.1192 45
7 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
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

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