ML20B A70204 - GB T 6478-2001

Grade	ML20B
China ISC	A70204
Corresponding Standard	GB T 6478-2001 Steels for cold heading and cold extruding
Classification	Alloy Steel

ML20B Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr ^*	Ni ^*	Cu ^*	B	Al ^ⓐ
Minimum Value	0.17	-	0.5	-	-	-	-	-	0.0005	0.02
Maximum Value	0.24	0.4	0.8	0.035	0.035	0.2	0.2	0.2	0.0035	-

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.

ML20B 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	≤500			* ≥64
Sample diameter d=25	Normalizing temperature 880~910°C, quenching temperature 860~900°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)

1	GB T 6478-2001
	ML20B A70204
2	GB /T 6478-2015
	ML20B A70204
3	GB /T 28906-2012
	ML20B A70204
4	GB /T 5953.1-2009
	ML20B
5	GB /T 28906-2025
	ML20B 0.008

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