Products

34CrMo4 - Nr.1.7220 34CrMoS4 - Nr.1.7226

Steel with chromium and molybdenum, used in the production of average-sized pieces. At the quenched and tempered state it has good mechanical characteristics and does not suffer from embrittlement from tempering.

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 10084: 2008		(UNI 7845-78)	(DIN 17200-86)		(NF A 35-552-86)	(BS 970 pt.3-96)	ASTM A 29
Grade	N°		Werkstoff	N°
34CrMo4	1.7220	35CrMo4	34CrMo4	1.7220	35CD4	-	4135
34CrMoS4	1.7226	35CrMo4	34CrMoS4	1.7226	35CD4	-	4135

Chemical Composition (Cast Analysis) (%)

EUROPE	C	Si	Mn	P/max	S	Cr	Mo	Cu/max	Al	Pb
34CrMo4	0,30÷0,37	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	-
34CrMoS4					0,020÷0,040					-
34CrMoS4Pb					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	223	800	1000÷1200	11	45	-
16<d≤40	255	223	650	900÷1100	12	50	40
40<d≤100	255	223	550	800÷950	14	55	45
100<d≤160	255	223	500	750÷900	15	55	45
160<d≤250	255	223	450	700÷850	15	60	45

* Depending on the chemical composition of the cast, and on the dimension, particularly in the case of the +HH grades, soft annealing may 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	-	-	-	-	-	750	1000÷1200	8	285
10<d≤16	-	-	-	-	-	720	1000÷1200	8	275
16<d≤40	223	650	900÷1100	12	40	650	900÷1100	9	270
40<d≤63	223	550	800÷950	14	45	600	800÷950	10	265
63<d≤100	223	550	800÷950	14	45	550	800÷950	10	265

*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÷870-->650
Soft annealing	680÷720
Quenching in water or oil	840÷860
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	57	57	57	56	55	54	53	52	48	45	43	41	40	40	39
+H	Min	49	49	48	45	42	39	36	34	30	28	27	26	25	24	24
+HH	Max	57	57	57	56	55	54	53	52	48	45	43	41	40	40	39
+HH	Min	52	52	51	49	46	44	42	40	36	34	32	31	30	29	29
+HL	Max	54	54	54	52	51	49	47	46	42	39	38	36	35	35	34
+HL	Min	49	49	48	45	42	39	36	34	30	28	27	26	25	24	24