ML20B A70204 - GB /T 6478-2015

Grade	ML20B
China ISC	A70204
Corresponding Standard	GB /T 6478-2015 Steels For Cold Heading And Cold Extruding
Classification	Alloy Steel
Properties	Forgability

ML20B Chemical Element Composition Content (%)

Component	C	Si ^c	Mn	P	S	B ^b	Al ^a
Minimum Value	0.18	0.1	0.6	-	-	0.0008	0.02
Maximum Value	0.23	0.3	0.9	0.025	0.025	0.0035	-

ML20B 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 %
5（12）≤d≤60（100）	Annealing	≤500			≥64
d=25 (Sample Diameter)	Normalizing temperature 880~910°C, quenching temperature 860~890°C water or oil cooling, tempering temperature 550~660°C	≥550	≥400	≥16

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
ML20B GB/T 6478-2015 GB/T 6478-2001	A70204	SWRCHB 223 JIS G3508-1	10B21 ASTM A29/A29M-12 ASTM A510/A510-13	CE20BG1 ISO 4954-1993	17B2 EN 10263-4-2001

ML20B 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"!