C40 - JIS G 7105-2000

Grade	C40
Corresponding Standard	JIS G 7105-2000 Heat-Treatable Steels, Alloy Steels and Free-Cutting Steels — Part 18 : Bright Products Of Unalloyed and Low Alloy Steels
Classification	Carbon Steel
Properties	Carburizing Ability

C40 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S
Minimum Value	0.37	0.1	0.5	-	-
Maximum Value	0.44	0.4	0.8	0.045	0.045

◎ Steels with machinability which has been improved either by the addition of lead or by higher sulfur levels up to about 0.100 % (m/m) S (including controlled sulfide morphology) may be available on request.

C40 Mechanical Properties

thickness t mm	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Hardness HBW
t≤5	TC	≥720	≥580	≥4
5＜t≤10	TC	≥690	≥530	≥5
10＜t≤16	TC	≥650	≥490	≥6
16＜t≤25	TC	≥630	≥455	≥7
25＜t≤40	TC	≥600	≥430	≥8
40＜t≤100	TC	≥550	≥290	≥9
t≤100	TC+TA, P+TA or G+TA				≥197
t≤16	TC+TN, P+TN or G+TN	≥580	≥320	≥16
16＜t≤100	TC+TN, P+TN or G+TN	≥550	≥290	≥17
100＜t≤250	TC+TN, P+TN or G+TN	≥530	≥260	≥17
t≤16	TC+TQ+TT℗, P+TQ+TT or G+TQ+TT	650~800	≥460	≥16
16＜t≤40	TC+TQ+TT℗, P+TQ+TT or G+TQ+TT	630~780	≥400	≥18
40＜t≤100	TC+TQ+TT℗, P+TQ+TT or G+TQ+TT	600~750	≥350	≥19
100＜t≤250	TC	Be agreed	Be agreed	Be agreed
100＜t≤250	TC+TA, P+TA or G+TA				Be agreed
100＜t≤250	TC+TQ+TT, P+TQ+TT or G+TQ+TT	Be agreed	Be agreed	Be agreed

C40 Corresponding Standards(Same grade name, different standards)

1	ISO 683-18-1996
	C40
2	DIN 17200-1987
	C40 1.0511
3	ISO 683-1-1987
	C40
4	EN 10083-2-2006
	C40 1.0511
5	JIS G 7401-2000
	(C40) 41CrNiMo2E
6	ISO 4954-1993
	(C40) 41CrNiMo2E
7	EN 10250-2-2000
	C40 1.0511
8	EN 10277-2-2008
	C40 1.0511
9	ISO 683-1-2016
	C40
10	DIN EN ISO 683-1-2018
	C40
11	ISO 683-18-2014
	C40
12	NF EN 10083-2-2006
	C40 1.0511
13	JIS G 7105-2000
	C40

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