F568M Class 8.8 - ASTM F568M-2007

Grade	F568M Class 8.8
Corresponding Standard	ASTM F568M-2007 Carbon and Alloy Steel Externally Threaded Metric Fasteners
Classification	Carbon Steel

F568M Class 8.8 Chemical Element Composition Content (%)

	Component	C	P	S ^①
中碳钢	Minimum Value	0.25	-	-
中碳钢	Maximum Value	0.55	0.048	0.058

	Component	C	Mn	P	S	B
低碳钢马氏体钢	Minimum Value	0.15	0.74	-	-	0.0005
低碳钢马氏体钢	Maximum Value	0.4	-	0.048	0.058	-

F568M Class 8.8 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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