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Home Material GB /T 3078-2019
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Grade 40
Other Names
Corresponding Standard GB /T 3078-2019
Quality structural steel cold drawm bars
Classification Carbon Steel
40 Mechanical Properties
condition Heat Treatment or Condition
Tensile Strength
σb
Mpa 		Elongation or Extension Rate
δ
% 		Reduction of Area
ψ
% 		Hardness
HBW
Delivery condition Annealing, Bright Annealing, High-Temperature Tempering or Normalizing and Tempering ≤207
Delivery condition Cold Drawing, Cold Drawing and Polishing ≤241
Delivery condition Cold Drawing ≥610 ≥6 ≥35
Delivery condition Annealing ≥510 ≥14 ≥40
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 Japan International Organization for Standardization European Standard
GB JIS ISO EN Numerical Grade
40 S40C C40 C40 1.0511
3 Approximate Comparison Table
China Japan International Organization for Standardization European Standard
GB JIS ISO EN Numerical Grade
40 S40C C40E C40E 1.1186
4 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
5 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
6 Approximate Comparison Table
China United Kingdom
GB BS EN/BS
40 080A42
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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