38CD 4 - NF A 35-557-1983

Grade	38CD 4
Corresponding Standard	NF A 35-557-1983 Iron And Steel — Heat Treatable Steels for Externally Threaded, High Performance Fasteners for Engineering Purposes.
Classification	Alloy Steel
Properties	High Strength

38CD 4 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Mo
Minimum Value	0.35	0.1	0.6	-	-	0.9	0.15
Maximum Value	0.41	0.4	0.9	0.035	0.035	1.2	0.25

38CD 4 Mechanical Properties

condition	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Hardness HBW	Impact Energy Absorption KV2 J
Bar, coil; d = 40	Oil Quenching	-	-	-	HRC42	-
Bar, coil; d = 32	Oil Quenching	-	-	-	HRC45	-
Bar, Coil; d=20	Oil Quenching	-	-	-	HRC48	-
Bar, Coil; d≤20	Quenching and Tempering	1130~1330	≥910	≥9	-	Charpy U Notch ≥35
Bar, Coil; 20<d≤40	Quenching and Tempering	1030~1230	≥830	≥9	-	≥35

38CD4 Corresponding Standards(Same grade name, different standards)

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