34CD 4 - NF A 35-557-1983

Grade	34CD 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	Strength

34CD 4 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Mo
Minimum Value	0.31	0.1	0.6	-	-	0.9	0.15
Maximum Value	0.37	0.4	0.9	0.035	0.035	1.2	0.25

34CD 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 = 32	Oil Quenching	-	-	-	HRC42	-
Bar, coil; d = 25	Oil Quenching	-	-	-	HRC45	-
Bar stock, coil; d = 16	Oil Quenching	-	-	-	HRC48	-
Bars, coiled bars; d≤16	Quenching and Tempering	1080~1280	≥870	≥10	-	Charpy U Notch ≥40
Bar, Coil; 16<d≤32	Quenching and Tempering	1000~1180	≥820	≥10	-	≥40

1 Approximate Comparison Table Cold Heading Steel

China		United States		International Organization for Standardization	Germany		France
GB	ISC	ASTM/AISI	UNS	ISO	DIN EN/DIN	W-Nr.	NF EN/NF
ML35CrMo	A30354	4135 A320ML7B	G41350	34CrMo4E (C31)	34CrMo4	1.7220	34CD4

2 Approximate Comparison Table Structural Alloy Steel

China	Japan	United States	International Organization for Standardization	Germany	France	European Standard		Russia	Sweden	United Kingdom
GB	JIS	ASTM	ISO	DIN EN/DIN	NF EN/NF	EN	Numerical Grade	GOST	SS	BS EN/BS
35CrMo ZG35CrMo	SCM435H	4135	34CrMo4	34CrMo4	34CD4 35CD4	34CrMo4	1.7220	35KHM 35KHML	2234	708A30 708M32

3 Approximate Comparison Table Cast Steel

China	Japan	United States	International Organization for Standardization	Germany	France	European Standard		Russia	Sweden	United Kingdom
GB	JIS	ASTM	ISO	DIN EN/DIN	NF EN/NF	EN	Numerical Grade	GOST	SS	BS EN/BS
ZG35CrMo 35CrMo	SCM435H	4135	34CrMo4	34CrMo4	34CD4 35CD4	34CrMo4	1.7220	35KHM 35KHML	2234	708A30 708M32

34CD4 Corresponding Standards(Same grade name, different standards)

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