ML30B A70304 ML28B - GB /T 6478-2015

Grade	ML30B
China ISC	A70304
Old Grade
Corresponding Standard	GB /T 6478-2015 Steels for Cold Heading and Cold Extruding
Classification	Alloy Steel
Properties	Forgability

ML30B Chemical Element Composition Content (%)

Component	C	Si ^{^c}	Mn	P	S	B ^{^b}	Al ^{^a}
Minimum Value	0.28	0.1	0.6	-	-	0.0008	0.02
Maximum Value	0.33	0.3	0.9	0.025	0.025	0.0035	-

ML30B 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	≤530			≥62
d=25 (sample diameter)	Normalizing temperature 870~900°C, Quenching temperature 850~890°C water or oil cooling, Tempering temperature 550~660°C	≥630	≥480	≥14

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	ISC	JIS	ASTM/AISI	ISO	EN
ML30B GB/T 6478-2015 ML28B GB/T 6478-2001	A70304	SWRCHB 331 JIS G3508-1	10B30 ASTM A29/A29M-12 ASTM A510/A510-13	CE28B ISO 4954-1993	28B2 EN 10263-4-2001

ML30B 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"!