Products

51CrV4 - Nr.1.8159

Chrome vanadiuam alloy steel generally used for hardened springs, keys, chisels

References and Comparable Standards

EUROPE		ITALY	GERMANY		FRANCE	UK	USA
EN 10083-3: 2006 EN 10277-5: 2008		(UNI 7845-78)	(DIN 17200-86)		(NF A 35-552-86)	(BS 970 pt.3-96)	ASTM A 29
Grade	N°		Werkstoff	N°
51CrV4	1.8159	50Crv4	(50Crv4)	1.8159	51CV4	735A51	(6150)

C	Si	Mn	P/max	S	Cr	V	Cu/max	Al
0,47÷0,55	0,10÷0,40	0,60÷1,00	0,025	≤ 0,035	0,80÷1,10	0,10÷0,25	0,40	0,020÷0,050

Size (mm)	Treated to improve shearability (+S)	Soft annealing (+A)	Quenched and tempered (+QT)
Size (mm)	HB max to condition	HB max to condition	Rp0,2 (MPa) min	Rm (MPa) min	A5 (%) min	Z (%) min	KV (J) min
d≤16	-	248	900	1100÷1300	9	40	-
16<d≤40	-	248	800	1000÷1200	10	45	30
40<d≤100	-	248	700	900÷1100	12	50	30
100<d≤160	-	248	650	850÷1000	13	50	30
160<d≤250	-	248	600	800÷950	13	50	30

Depending on the chemical composition of the cast, and on the dimension, particularly in the case of the +HH grades, soft annealing can be necessary

Size (mm)	as Rolled+Turned (+A+SH)	Quenched+Tempered+Turned (+QT+SH)				Cold Drawn +Quenched+Tempered (+C+QT)			as Rolled+Cold Drawn (+A+C)
Size (mm)	Hardness HB max	Rp0,2 (MPa) min	Rm (MPa) min	A5 (%) min	KV (J) min	Rp0,2 (MPa) min	Rm (MPa)	A5 (%) min	Hardness HB max
d≤16	248	900	1100÷1300	9	-	900	1100÷1300	9	311
16<d≤40	248	800	1000÷1200	10	30	800	1000÷1200	10	293
40<d≤80	248	780	900÷1100	12	30	780	900÷1100	12	287

For size <5 mm the mechanical properties may be agreed at the time of enquiry and order

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	45	50
+H	Max	65	65	64	64	63	62	62	61	60	58	57	55	54	53	53
+H	Min	57	56	55	54	53	52	50	48	44	41	37	35	34	33	32
+HH	Max	65	65	64	64	63	62	62	61	60	58	57	55	54	53	53
+HH	Min	60	59	58	57	56	55	54	52	49	47	44	42	41	40	39
+HL	Max	62	62	61	61	60	59	58	57	55	52	50	48	47	46	46
+HL	Min	57	56	55	54	53	52	50	48	44	41	37	35	34	33	32