Products

34Cr4 – Nr.1.7033 34CrS4 – Nr.1.7037

Low-alloy steel with addition of chrome only,similar to the 37CrS4 ; it is mainly used in bolts production for small and medium-sized pieces

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 10083-3: 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°
34Cr4	1.7033	-	34Cr4	1.7033	32C4	-	5135
34CrS4	1.7037	-	34CrS4	1.7037	32C4	-	5135

Chemical Composition (Cast Analysis) (%)

EUROPE	C	Si	Mn	P/max	S	Cr	Cu/max	Al	Pb
34Cr4	0,30÷0,37	0,10÷0,40	0,60÷0,90	0,025	≤0,035	0,90÷1,20	0,40	0,020÷0,050	-
34CrS4	0,30÷0,37	0,10÷0,40	0,60÷0,90	0,025	0,020÷0,040	0,90÷1,20	0,40	0,020÷0,050	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	Sertlik (HB) max	Rp0,2 (MPa) min	Rm (MPa) min	A5 (%) min	Z (%) min	KV (J) min
d≤16	255	223	700	900÷1100	12	35	-
16<d≤40	255	223	590	800÷950	14	40	40
40<d≤100	255	223	460	700÷850	15	45	40

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	Sertlik (HB) max
5≤d≤10	-	-	-	-	-	700	900÷1100	8	285
10<d≤16	-	-	-	-	-	700	900÷1100	9	275
16<d≤40	223	590	800÷950	14	40	580	800÷1000	9	270
40<d≤63	223	460	700÷850	15	40	510	700÷900	10	265
63<d≤100	223	460	700÷850	15	40	480	700÷900	11	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	İşlem Sıcaklığı °C
Hot forgings deformation	850÷1150
Isothermal annealing	850÷880-->675
Soft annealing	680÷720
Quenching in oil	840÷870
Tempering	540÷660

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	56	54	52	49	46	44	39	37	35	34	33	32	31
+H	Min	49	48	45	41	35	32	29	27	23	21	20	-	-	-	-
+HH	Max	57	57	56	54	52	49	46	44	39	37	35	34	33	32	31
+HH	Min	52	51	49	45	41	38	35	33	28	26	25	24	23	22	21
+HL	Max	54	54	52	50	46	43	40	38	34	32	30	29	28	27	26
+HL	Min	49	48	45	41	35	32	29	27	23	21	20	-	-	-	-