ML40CrMo A30404 ML42CrMo - GB /T 6478-2015

Grade	ML40CrMo
China ISC	A30404
Old Grade
Corresponding Standard	GB /T 6478-2015 Steels for Cold Heading and Cold Extruding
Classification	Alloy Steel
Properties	Forgability

ML40CrMo Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Mo
Minimum Value	0.38	0.1	0.6	-	-	0.9	0.15
Maximum Value	0.43	0.3	0.9	0.025	0.025	1.2	0.3

ML40CrMo Mechanical Properties

diameter 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 %
d=25 (Sample diameter)	Quenching temperature 830~870°C oil quenching, tempering temperature 500~600°C	≥1080	≥930	≥12	≥45

New and Old Grade Replacement List

Approximate Comparison Table Steel for Cold Heading and Cold Extrusion

China	Japan	United States	International Organization for Standardization	European Standard
GB	JIS	ASTM	ISO	EN
ML40CrMo	SCM440	4140	42CrMo4	42CrMo4

ML40CrMo Corresponding Standards(Same grade name, different standards)

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