Products

37CrS4 - Nr.1.7038

Low-alloy steel with the addition of chrome only , similar to the 41CrS4 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 7847-79)	(DIN 17200-86)		(NF A 38-556-84)	(BS 970 pt.3-96)	ASTM A 29
Grade	N°		Werkstoff	N°
37CrS4	1.7038	38Cr4	37CrS4	1.7038	38C4	530M36	1060

Chemical Composition (Cast Analysis) (%)

C	Si	Mn	P/max	S	Cr	Cu/max	Al
0,34÷0,41	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	HB max to condition	Rp0,2 (MPa) min	Rm (MPa) min	A5 (%) min	Z (%) min	KV (J) min
d≤16	255	235	750	950÷1150	11	35	-
16<d≤40	255	235	630	850÷1000	13	40	35
40<d≤100	255	235	510	750÷900	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 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	-	-	-	-	-	730	950÷1150	8	290
10<d≤16	-	-	-	-	-	710	950÷1150	8	280
16<d≤40	235	630	850÷1000	13	35	600	850÷1050	9	275
40<d≤63	235	510	750÷900	14	35	530	750÷950	10	270
63<d≤100	235	510	750÷900	14	35	520	750÷950	11	270

*For reference only
**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	825÷865
Tempering	540÷680

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	59	59	58	57	55	52	50	48	42	39	37	36	35	34	33
+H	Min	51	50	48	44	39	36	33	31	26	24	22	20	-	-	-
+HH	Max	59	59	58	57	55	52	50	48	42	39	37	36	35	34	33
+HH	Min	54	53	51	48	44	41	39	37	31	29	27	25	24	23	22
+HL	Max	56	56	55	53	50	47	44	42	37	34	32	31	30	29	28
+HL	Min	51	50	48	44	39	36	33	31	26	24	22	20	-	-	-