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Grade 40
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
40 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Cu As
Minimum Value 0.37 0.17 0.5 - - - - - -
Maximum Value 0.45 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.
40 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 ≥570 ≥335 ≥19 ≥45
Rolled product Hard-worked ≥610 ≥6 ≥35
Rolled product Annealed or high-temperature tempered ≥510 ≥14 ≥40
Sample Hardening+temper KCU: ≥59J/cm2
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
40 U20402 S40C S40C SM40C 1040 G10400 C40E4 C40E
Ck40 		1.1186 C40E
XC42 		40 C40E
080M40
2 Approximate Comparison Table
China Taiwan, China Japan South Korea United States International Organization for Standardization France Russia United Kingdom
GB ISC CNS JIS KS ASTM/AISI UNS ISO NF EN/NF GOST BS EN/BS
ML40 U40402 SWRCH40K SWRCH40K SWRCH40K 1040 G10400 CE40E4 XC40
FR38 		40 1/3
3 Approximate Comparison Table
China Japan United States International Organization for Standardization Germany France European Standard Russia United Kingdom
GB JIS ASTM ISO DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade GOST BS EN/BS
40 S40C 1038
1040 		C40
C40E4 		C40
Ck40 		1.0511 AF60C40
AF60C45
XC42HI 		C40 1.0511 40 070M40
080M40
En8
4 Approximate Comparison Table
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
35 S35C 1035
Gr.1035 		C35
C35E4 		C35 1.0501 AF55C35
C35 		C35 1.0501 35
40 		1550 070M36
40HS
5 Approximate Comparison Table
Japan United States International Organization for Standardization Germany France European Standard Russia United Kingdom
JIS ASTM ISO DIN EN/DIN NF EN/NF EN Numerical Grade GOST BS EN/BS
S40C 1040 C40E4 Ck40 XC42H1 C40E 1.1186 40 080M40
CS40
6 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
40 		S40C 1040 ISO 630-1:1987
C40
C40E4
C40M2 		C42
XC42 		40 060A40
40 Corresponding Standards(Same grade name, different standards)
1 GB /T 699-1999
40 U20402 40#
2 GB /T 699-2015
40 U20402
3 GOST 1050-1988
40
4 GB /T 17107-1997
40
5 GB /T 3078-2019
40 40#
6 GB /T 710-2008
40 U20402 40#
7 GB /T 711-2017
40 40#
8 HB /Z 136-2000
40
9 GB /T 13237-2013
40
10 GB 3522-1983
40

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