18CrNiM07-6

18CrNiMo7-6 EN 10084-1998, Number: 1.6587	Comparison of steel grades
	JUS	Ć.4520
	DIN	17CrNiM06
	BS	-
	GOST	-
	AISI	4820
	UNI	-
	NF	18NCD6

Chemical composition (cast analysis)

Chemical elements	C	Si max	Mn	P max.	S	Cr	Mo	Ni
%, by mass	0,15-0,21	0,40	0,50-0,90	0,035	≤ 0,035	1,50-1,80	0,25-0,35	1,40-1,70
Permissible deviation	± 0,02	+ 0,03	± 0,04	+ 0,005	+ 0,005	± 0,05	± 0,02	± 0,02

Hardness limits for steel

Hardness HRC at a distance from quenched end of test piece (in milimetres) of
mm		1,5	3	5	7	9	11	13	15	20	25	30	35	40	45	50
+H	max.	48	48	48	48	47	47	46	46	44	43	42	41	41	-	-
+H	min.	40	40	39	38	37	36	35	34	32	31	30	29	29	-	-
+HH	max.	48	48	48	48	47	47	46	46	44	43	42	41	41	-	-
+HH	min.	43	43	42	41	40	40	39	38	36	35	34	33	33	-	-
+HL	max.	45	45	45	45	44	43	42	42	40	39	38	37	37	-	-
+HL	min.	40	40	39	38	37	36	35	34	32	31	30	29	29	-	-

Hardness requirements for products delivered in the conditions ’’treated to improve shearabilita’’ (+S), ’’anneled to maximum hardness requirements’’ (+A), ’’treated to hardness range’’ (+TH) or ’’treated to ferrite-pearlite structure and hardness range’’ (+FP)

Brinell hardness in the condition
+S max.	+A max.	+TH			+FP
		min.		max.	min.	max.
255	229	179	229		159	207

Non-metallic inclusions Requirements for microscopic degree of purity when tested in accordance with DIN 50 602 (method K) (valid for oxidic non-metallic inclusions)

D (mm) Bars Diameter d (mm)	K Total characteristic value K (oxides) for the individual cast
140 < d 200	K 4 ≤ 50
100 < d ≤ 140	K 4 ≤ 45
70 < d ≤ 100	K 4 ≤ 40
35 < d ≤ 70	K 4 ≤ 35
17 < d ≤ 35	K 3 ≤ 40
8 < d ≤ 17	K 3 ≤ 30
d ≤ 8	K 2≤ 35

Conditions for heat treating test bars and treatment of the steels

End quenchh test Quenching, 0C	Carbunnzing temperature, 0C	Core-hardening temperature, 0C	Case-hardening temperature, 0C	Tempering, 0C
860	880 to 980	830 to 870	780 to 820	150 to 200

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