F568M Class 8.8.3 B - ASTM F568M-2007

Grade	F568M Class 8.8.3 B
Corresponding Standard	ASTM F568M-2007 Carbon and Alloy Steel Externally Threaded Metric Fasteners
Classification	Alloy Steel

F568M Class 8.8.3 B Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	Mo
Minimum Value	0.38	0.3	0.7	0.06	-	0.5	0.5	0.2	-
Maximum Value	0.48	0.5	0.9	0.12	0.05	0.75	0.8	0.4	0.06

F568M Class 8.8.3 B Mechanical Properties

Heat Treatment or Condition	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %	Hardness HBW
Quenching + Tempering, Minimum Tempering Temperature 425℃	≥830	≥660	≥12	≥35	HRC 23~34

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