Products

41Cr4 - Nr.1.7035 41CrS4 - Nr.1.7039

A low-alloy steel with the addition of chromium only, it is primarily used in bolts 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°
41Cr4	1.7035	41Cr4	41Cr4	1.7035	42C4	530M40	-
41CrS4	1.7039	41Cr4	41CrS4	1.7039	42C4	530M40	-

Chemical Composition (Cast Analysis) (%)

EUROPE	C	Si	Mn	P/max	S	Cr	Cu/max	Al
41Cr4	0,38÷0,45	0,10÷0,40	0,60÷0,90	0,025	≤ 0,035	0,90÷1,20	0,40	0,020÷0,050
41CrS4	0,38÷0,45	0,10÷0,40	0,60÷0,90	0,025	0,020÷0,040	0,90÷1,20	0,40	0,020÷0,050

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	800	1000÷1200	11	30	-
16<d≤40	255	241	660	900÷1100	12	35	35
40<d≤100	255	241	560	800÷950	14	40	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	295
10<d≤16	-	-	-	-	-	750	1000÷1200	8	285
16<d≤40	241	660	900÷1100	12	35	670	900÷1100	9	280
40<d≤63	241	560	800÷950	14	35	570	800÷1000	10	270
63<d≤100	241	560	800÷950	14	35	570	800÷1000	11	270

*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	850÷880-->675
Soft annealing	680÷720
Quenching in water or oil	830÷860
Tempering	550÷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	61	61	60	59	58	56	54	52	46	42	40	38	37	36	35
+H	Min	53	52	50	47	41	37	34	32	29	26	23	21	-	-	-
+HH	Max	61	61	60	59	58	56	54	52	46	42	40	38	37	36	35
+HH	Min	56	55	53	51	47	43	41	39	35	31	29	27	26	25	24
+HL	Max	58	58	57	55	52	50	47	45	40	37	34	32	31	30	29
+HL	Min	53	52	50	47	41	37	34	32	29	26	23	21	-	-	-