ML40Cr A20404 - GB T 6478-2001

Grade	ML40Cr
China ISC	A20404
Corresponding Standard	GB T 6478-2001 Steels for cold heading and cold extruding
Classification	Alloy Steel

ML40Cr Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni ^*	Cu ^*
Minimum Value	0.38	-	0.6	-	-	0.9	-	-
Maximum Value	0.45	0.3	0.9	0.035	0.035	1.2	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.

ML40Cr 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 %
Steel	Annealing	≤620			≥58
Sample diameter d=25	Quenching temperature 820~860°C water or oil quenching, tempering temperature 540~680°C	≥900	≥660	≥11

Approximate Comparison Table Cold Heading Steel

China		United States		International Organization for Standardization	Germany		France	Russia	United Kingdom
GB	ISC	ASTM/AISI	UNS	ISO	DIN EN/DIN	W-Nr.	NF EN/NF	GOST	BS EN/BS
ML40Cr	A20404	5140	G51400	41Cr4E (C16)	41Cr4	1.7035	38C4 42C4	40Х	3/2

ML40Cr Corresponding Standards(Same grade name, different standards)

1	GB T 6478-2001
	ML40Cr A20404
2	GB /T 6478-2015
	ML40Cr U20404
3	Q/BQB 517-2018
	ML40Cr
4	GB /T 28906-2012
	ML40Cr A20404
5	GB /T 5953.1-2009
	ML40Cr
6	Q/ASB 234-2018
	ML40Cr
7	Q/OHAB 113-2020
	ML40Cr
8	GB /T 28906-2025
	ML40Cr

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