SFNCM 690D SFNCM 70D - JIS G 3222-1988

Grade	SFNCM 690D
Old Grade
Corresponding Standard	JIS G 3222-1988 Nickel Chromium Molybdenum Steel Forgings for General Use
Classification	Alloy Steel

SFNCM 690D 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 690D Mechanical Properties

thickness 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
t≤200	690~830	≥490	≥16	≥42	HB：≥201 HS：≥31	Impact value tangential ≥64 J/cm²
200＜t≤300	690~830	≥490	≥15	≥41	HB：≥201 HS：≥31	Impact value tangential ≥59 J/cm²
300＜t≤400	690~830	≥480	≥14	≥40	HB：≥201 HS：≥31	Impact value tangential ≥54 J/cm²
400＜t≤600	690~830	≥480	≥13	≥39	HB：≥201 HS：≥31	Impact value tangential ≥54 J/cm²

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