42CrMoS4 / 1.7227 Steel

42CrMoS4 is a direct hardening steel like 42CrMo4 but with controlled sulphur content for improved machinability. The material is stocked in cold drawn hardened and tempered condition.

42CrMoS4 Supply Form & Size & Tolerance

Form of Supply	Size(mm)	Length(mm)
Round bar	Φ6-Φ1,000	3,000-10,000
Square bar	100×100-600×600	3,000-6,000
Plate/Sheet	Thickness :20-400 Width:80-1,000	2,000-6,000
Flat bar/Blcoks	Thickness :120-800 Width:120-1,500	2,000-6,000

42CrMoS4 Surface Finish&Tolerance

Surface Finish	Black-Forged	Black-Rolled	Turned	Grinding	Polished	Peeled	Cold Drawn
Tolerance	(0，+5mm)	(0，+1mm)	(0，+3mm)	Best h9	Best h11	Best H11	Best H11

42CrMoS4 Chemical Composition

Grade	C	Si	Mn	Cr	Mo	P	S
42CrMoS4/1.7227	0.38-0.45	≤ 0.4	0.6-0.9	0.9-1.2	0.15-0.3	≤ 0.025	0.02-0.04

42CrMoS4 Relevant Standards

EU
EN

USA
–

Germany
DIN,WNr

France
AFNOR

Italy
UNI

Spain
UNE

Inter
ISO

42CrMoS4

4140

42CrMoS4

42CD4u

42CrMo4

40CrMo41

42CrMoS4

42CrMoS4 Mechanical Property

Nominal diameter (mm):	to 16	16 – 40	40 – 100	100 – 160	160 – 250
Rm – Tensile strength (MPa) (+QT)	1100-1300	1000-1200	900-1100	800-950	750-900

Rm – Tensile strength (MPa) (+AC)

630

Nominal diameter(mm): or for flat products thickness: to 8; 8-20; 20-60; 60-100; 100-160;	to 16	16 – 40	40 – 100	100 – 160	160 – 250
Re – Upper yield strength or R_p0.2 – 0.2% proof strength (MPa) (+QT)	900	750	650	550	500

Nominal thickness (mm):	to 16	16 – 40	40 – 100	100 – 160	160 – 250
A – Min. elongation Lo = 5,65 √ So (%) (+QT), round products	10	11	12	13	14

Nominal diameter (mm): or for flat products thickness: to 8; 8-20; 20-60; 60-100; 100-160;	to 16	16 – 40	40 – 100	100 – 160	160 – 250
Z – Reduction in cross section on fracture (%) (+QT)	40	45	50	50	55
Z – Reduction in cross section on fracture (%) (+AC)	58

Brinell hardness (HBW): (+S)	255
Brinell hardness (HBW): (+A)	241

Properties of steel 42CrMoS4 (1.7227)

Weldability: Bad weldability due to the high crack danger.
Hardenability: Medium-good hardenability, suitable for hot purposes till a temperature of 500. It can be hardened in oil.

42CrMoS4 Forging

42CrMoS4 forging temperature:900 – 1100°C ,cooling as slowly as possible in still air or in sand after forged.

42CrMoS4 Heat Treatment

Normalizing: 850 – 880°C,Cooling in air
Soft Annealing:680 – 720°C,Cooling in furnace
Stress relieve:450-650°C,Cooling in air
Hardening:820 – 880°C,oil or water quench
Tempering:540 – 680°C,Cooling in air

42CrMoS4 Surface Hardness

Treated to improve shearability (+S):Max 255HB
Soft annealed (+A):Max 241HB
Pre Quenched and tempered:280-320HB
Flame or induction hardening:Min 53HRC

NORMAL HARDENABILITY +H (850°C – hardness HRC – distance mm)
Distance mm	1.5	3	5	7	9	11	13	15	20	25	30	35	40	45	50
HRC Min	53	53	52	51	49	43	40	37	34	32	31	30	30	29	29
HRC Max	61	61	61	60	60	59	59	58	56	53	51	48	47	46	45

42CrMoS4 Application

42CrMoS4 has high strength and wear-resistance,widely used in many industries.

Components with high strength and toughness for tools, automotive parts,mechanical engineering, armament components,such as geer wheels,pinions,connecting rods,parts for mechanical engineering.

Statically and dynamically stressed components for vehicles, engines and machines. For parts of larger cross-sections, crankshafts,gears