40 U20402 - GB /T 699-2015

Grade	40
China ISC	U20402
Corresponding Standard	GB /T 699-2015 Quality Carbon Structure Steels
Classification	Carbon Steel
Properties	Machinability
Density	7.85 g/cm³

40 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu
Minimum Value	0.37	0.17	0.5	-	-	-	-	-
Maximum Value	0.44	0.37	0.8	0.035	0.035	0.25	0.3	0.25

40 Mechanical Properties

diameter(thickness) d mm	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=25 (Sample size)	Normalizing + Quenching + Tempering	≥570	≥335	≥19	≥45	Unprocessed Steel ≤217	KU2 ≥47
						Annealed Steel ≤187

1 Approximate Comparison Table High-Quality Carbon Structural Steel

China

Taiwan, China

Japan

South Korea

United States

International Organization for Standardization

Germany

France

Russia

United Kingdom

ISC

CNS

JIS

ASTM/AISI

UNS

ISO

DIN EN/DIN

W-Nr.

NF EN/NF

GOST

BS EN/BS

U20402

S40C

SM40C

1040

G10400

C40E4

C40E
Ck40

1.1186

C40E
XC42

C40E
080M40

2 Approximate Comparison Table Carbon Structural Steel and Engineering Steel

China	Japan	International Organization for Standardization	European Standard
GB	JIS	ISO	EN	Numerical Grade
40	S40C	C40	C40	1.0511

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
40	S40C	C40E	C40E	1.1186

4 Approximate Comparison Table High-Quality Carbon Structural Steel

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 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 40	S40C	1040	ISO 630-1:1987 C40 C40E4 C40M2	C42 XC42	40	060A40

6 Approximate Comparison Table High-Quality Carbon Structural Steel

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

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