SFNCM 740S SFNCM 75S - JIS G 3222-1988

Grade	SFNCM 740S
Old Grade
Corresponding Standard	JIS G 3222-1988 Nickel chromium molybdenum steel forgings for general use
Classification	Alloy Steel

SFNCM 740S Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Mo
Minimum Value	-	0.15	0.35	-	-	0.4	0.4	0.15
Maximum Value	0.5	0.35	1	0.03	0.03	3.5	3.5	0.7

① Cu as an impure content. shall not exceed 0.03 % .
② The chemical composition can be determined through negotiation between the buyer and the manufacturer within the range shown in the table.

SFNCM 740S Mechanical Properties

Diameter or thickness d（t） mm	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %	Hardness HBW	Impact Energy Absorption KV2 J
d(t)≤200	740~880	≥540	l：≥17	l：≥48	HB：≥217 HS：≥33	Impact value tangential (J/cm²) l: ≥78
200＜d(t)≤400	740~880	≥530	l：≥16；tr.：≥12	l：≥46；tr.：≥30	HB：≥217 HS：≥33	Impact value tangential (J/cm²) l: ≥74；tr.: 49
400＜d(t)≤700	740~880	≥530	l：≥15；tr.：≥11	l：≥43；tr.：≥28	HB：≥217 HS：≥33	Impact value tangential (J/cm²) l: ≥69；tr.: 44
700＜d(t)≤1000	740~880	≥520	l：≥14；tr.：≥10	l：≥40；tr.：≥26	HB：≥217 HS：≥33	Impact value tangential (J/cm²) l: ≥59；tr.: 39

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