ML40 U40402 - GB T 6478-2001

Grade	ML40
China ISC	U40402
Corresponding Standard	GB T 6478-2001 Steels for cold heading and cold extruding
Classification	Carbon Steel

ML40 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr ^*	Ni ^*	Cu ^*
Minimum Value	0.37	-	0.3	-	-	-	-	-
Maximum Value	0.44	0.2	0.6	0.035	0.035	0.2	0.2	0.2

①By agreement between the supplier and the purchaser, other grades of cold heading and cold extrusion steel may be supplied.
②Permissible deviations in the chemical composition of the steel shall comply with the relevant provisions of GB/T 222-1984.

ML40 Mechanical Properties

condition	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
Sample diameter d=25	Normalizing Temperature AC3 + 30~50°C	≥570	≥335	≥19	≥45	Hot Rolled Brinell Hardness HBS ≤217

Approximate Comparison Table Cold Heading Steel

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

ML40 Corresponding Standards(Same grade name, different standards)

1	GB T 6478-2001
	ML40 U40402
2	GB /T 6478-2015
	ML40 U40402
3	GB /T 5953-1999
	ML40
4	GB /T 28906-2012
	ML40 U40402
5	GB /T 5953.1-2009
	ML40
6	GB /T 28906-2025
	ML40 U40402

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