SMn420 SMn 21 - JIS G 4106-1979

Grade	SMn420
Old Grade
Corresponding Standard	JIS G 4106-1979 Manganese Steels and Manganese Chromium Steels for Machine Structural Use
Classification	Alloy Steel

SMn420 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu
Minimum Value	0.17	0.15	1.2	-	-	-	-	-
Maximum Value	0.23	0.35	1.5	0.03	0.03	0.35	0.25	0.3

SMn420 Mechanical Properties

Heat Treatment or Condition	Tensile Strength σ_b Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %	Hardness HBW	Impact Energy Absorption KV2 J
Double Quenching and Tempering	≥686	≥14	≥30	201~311	≥49

New and Old Grade Replacement List

Approximate Comparison Table Structural Alloy Steel

China		Taiwan, China	Japan	South Korea	United States	International Organization for Standardization	Germany		France	Russia	United Kingdom
GB	ISC	CNS	JIS	KS	ASTM/AISI	ISO	DIN EN/DIN	W-Nr.	NF EN/NF	GOST	BS EN/BS
20Mn2	A00202	SMn420	SMn420	SMn420	1320 1524	22Mn6	20Mn6	1.1169	20M5	20Г2 20Г	150M19

SMn420 Corresponding Standards(Same grade name, different standards)

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