ML20MnB A71204 - GB /T 6478-2015

Grade	ML20MnB
China ISC	A71204
Corresponding Standard	GB /T 6478-2015 Steels For Cold Heading And Cold Extruding
Classification	Alloy Steel
Properties	Forgability

ML20MnB Chemical Element Composition Content (%)

Component	C	Si ^c	Mn	P	S	B ^b	Al ^a
Minimum Value	0.18	0.1	0.8	-	-	0.0008	0.02
Maximum Value	0.23	0.3	1.1	0.025	0.025	0.0035	-

ML20MnB Mechanical Properties

diameter d mm	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Reduction of Area ψ %
5（12）≤d≤60（100）	Annealing	≤520		≥62
d=25 (sample diameter)	Normalizing temperature 880~910°C, quenching temperature 860~890°C water or oil cooling, tempering temperature 550~660°C	≥650	≥500	≥14

Approximate Comparison Table Steel for Cold Heading and Cold Extrusion

China		Japan	United States	International Organization for Standardization	European Standard
GB	ISC	JIS	ASTM/AISI	ISO	EN
ML20MnB GB/T 6478-2015 GB/T 6478-2001	A71204	SWRCHB 320 JIS G3508.1-2010	10B22 ASTM A29/A29M-12 ASTM A510/A510M-13	CE20BG2 ISO 4954-1993	20MnB4 EN 10263-4-2001

ML20MnB 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"!