Products

17NiCrMo6-4 - Nr.1.6566 17NiCrMoS6-4 - Nr.1.6569

Alloy steel with chromium, nickel, and molybdenum. This is a carburized steel with excellent temperability that is often used to obtain pieces with high requirements and complex shapes such as gears and large shafts subject to fatigue and vibrations.

References and Comparable Standards

Standard Reference: EN ISO 683-3: 2018 (Hot-rolled) | EN 10277: 2018 (Bright products)

EUROPE		ITALY	GERMANY		FRANCE	UK	USA
UNI EN 10084:2008 UNI EN 10277-4:2008		(UNI 7846-78)	(DIN 17210-84)		(NFA35-551-86)	(BS970 pt.1--96)	ASTM A 29
Grade	N°		Werkstoff	N°
17NiCrMo6-4	1.6566	18NiCrMo5	-	-	18NCD6	815M17	-
17NiCrMoS6-4	1.6569				18NCD6	815M17	-

Chemical Composition (Cast Analysis) (%)

EUROPE	C	Si	Mn	P/max	S	Cr	Mo	Ni	Cu/max	Al	Pb
17NiCrMo6-4	0,14÷0,20	0,15÷0,40	0,60÷0,90	0,025	≤0,035	0,80÷1,10	0,15÷0,25	1,20÷1,60	0,40	0,020÷0,050	-
17NiCrMoS6-4					0,020÷0,040						-
17NiCrMoS6-4Pb					0,020÷0,040						0,15÷0,30

Note: 17NiCrMoS6-4 - 1.6569 not yet listed in ISO 683-3: 2016

Mechanical Properties - As Rolled Condition

Hardness (HB) - Treated to improve sherability (+S)	Hardness (HB) - Annealed to maximum hardness requirements (+A)			Hardness (HB) - Treated to hardness range (+TH)			Hardness (HB) - Treated to ferrite-pearlite structure and hardness range (+FP)
≤ 255	≤ 229			≥ 179		≤ 229	≥ 149	≤ 201

Mechanical Properties – Bright Steel

Size (mm)	+A*+ Turned (+A +SH)	+A*+ Cold drawn (+A+C)	FP**+ Turned (+FP +SH)	FP**+ Cold drawn (+FP +C)
Size (mm)	Hardness HB max	Hardness HB max	Hardness HB	Hardness HB
5≤d≤10	-	275	-	-
10<d≤16	-	265	-	-
16<d≤40	229	260	149÷201	149÷250
40<d≤63	229	255	149÷201	149÷245
63<d≤100	229	255	149÷201	149÷245

*+A = annealed to maximum hardness requirement
**+FP = treated to ferrite-perlite structure and hardness range
For size <5 mm the mechanical properties may be agreed at the time of enquiry and order

Working Temperatures Recommended

Operation	°C
Hot forgings deformation	900÷1150
Carburizing temperature	880÷980
Core quenching temperature	830÷870
Case quenching temperature	780÷820
Tempering	150÷200

Hardness Limits (Jominy Test)

Limits of range		Hardness HRC at a distance from quenched end of test pieces (mm)
Limits of range		1,5	3	5	7	9	11	13	15	20	25	30	35	40
+H	Max	48	48	47	46	45	44	42	41	38	36	35	34	33
+H	Min	40	40	37	34	30	28	27	26	24	23	22	21	-
+HH	Max	48	48	47	46	45	44	42	41	38	36	35	34	33
+HH	Min	43	43	40	38	35	33	32	31	29	27	26	25	24
+HL	Max	45	45	44	42	40	39	37	36	33	32	31	30	29
+HL	Min	40	40	37	34	30	28	27	26	24	23	22	21	-