Products

42CrMo4 - Nr.1.7225 42CrMoS4 - Nr.1.7227

The most widely used of the quenched and tempered steels. The excellent temperability and the absence of embrittlement fragility make this steel suitable for the production of a variety of pieces, also of medium-large size, with high mechanical characteristics.

References and Comparable Standards

Standard Reference: EN ISO 683-2: 2018 (Hot-rolled products) | EN 10277: 2018 (Bright products)

EUROPE		ITALY	GERMANY		FRANCE	UK	USA
EN 10083-2: 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°
42CrMo4	1.7225	42CrMo4	42CrMo4	1.7225	42CD4	708M40	4140
42CrMoS4	1.7227	42CrMo4	42CrMoS4	1.7227	42CD4	708M40	4140

Chemical Composition (Cast Analysis) (%)

EUROPE	C	Si	Mn	P/max	S	Cr	Mo	Cu/max	Al	Pb
42CrMo4	0,38÷0,45	0,10÷0,40	0,60÷0,90	0,025	≤ 0,035	0,90÷1,20	0,15÷0,30	0,40	0,020÷0,050	-
42CrMoS4					0,020÷0,040					-
42CrMoS4Pb					0,020÷0,040					0,15÷0,30

Mechanical Properties - As Rolled Condition

Size (mm)	Treated to improve shearability (+S)*	Soft annealing (+A)	Quenched and tempered (+QT)
Size (mm)	HB max to condition		Rp0,2 (MPa) min	Rm (MPa) min	A5 (%) min	Z (%) min	KV (J) min
d≤16	255	241	900	1100÷1300	10	40	-
16<d≤40	255	241	750	1000÷1200	11	45	35
40<d≤100	255	241	650	900÷1100	12	50	35
100<d≤160	255	241	550	800÷950	13	50	35
160<d≤250	255	241	500	750÷900	14	55	35

*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

Mechanical Properties – Bright Steel

Size (mm)	as Rolled+Turned (+A+SH)	Quenched+Tempered+Turned (+QT+SH)*				Quenched+Tempered+Cold Drawn (+QT+C)			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
5≤d≤10	-	-	-	-	-	770	1000÷1200	8	300
10<d≤16	-	-	-	-	-	750	1000÷1200	8	290
16<d≤40	241	750	1000÷1200	11	35	720	1000÷1200	9	285
40<d≤63	241	650	900÷1100	12	35	650	900÷1100	10	280
63<d≤100	241	650	900÷1100	12	35	650	900÷1100	10	280

*This values are valid also for Cold Drawn - Quenched + Tempered Condition (+C +QT)
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	850÷1150
Isothermal annealing	830÷860-->650
Soft annealing	680÷720
Quenching in water or oil	830÷850
Tempering	550÷650

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	45	50
+H	Max	61	61	61	60	60	59	59	58	56	53	51	48	47	46	45
+H	Min	53	53	52	51	49	43	40	37	34	32	31	30	30	29	29
+HH	Max	61	61	61	60	60	59	59	58	56	53	51	48	47	46	45
+HH	Min	56	56	55	54	52	48	46	44	41	39	38	36	36	35	34
+HL	Max	58	58	58	57	56	54	53	51	49	46	44	42	41	40	40
+HL	Min	53	53	52	51	49	43	40	37	34	32	31	30	30	29	29