SUM31 - JIS G 4804-2021

SUM31 Chemical Element Composition Content (%)

Component	C	Mn	P	S
Minimum Value	0.14	1	-	0.08
Maximum Value	0.2	1.3	0.04	0.13

Approximate Comparison Table Free-Cutting Structural Steel

China	Japan	United States	International Organization for Standardization
GB	JIS	ASTM/AISI	ISO
Y15Mn GB/T 8731-2025	SUM31 JIS G4804-2021	1117 ASTM A29/A29M-20	15SMn13 ISO 683-4-2016

SUM31 Corresponding Standards(Same grade name, different standards)

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