DIN 42CrMo4 / 1.7225 Steel

42CrMo4 is a heat treatable steel which contains at least 0.9%Cr,0.15%Mo as strengthening elements.After quenched and tempered, It obtains high strength, good low-temperature impact toughness with a typical tensile strength of 900 -1200 N/mm2.42CrMo4 steel has better performance than 34CrMo4 steel due to the higher carbon and chromium content.Similar to AISI 4140,only a little difference in Mn,Cr content.This material also has good machinability,good wear-resistance,but the temper brittleness is not obvious,and poor in weldability.

42CrMo4 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

42CrMo4 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

42CrMo4 Chemical Composition per EN 10083-3

GRADE	NUMBER	C	Si	Mn	P	S	Cr	Mo
42CrMo4	1.7225	0.38-0.45	≤ 0.40	0.60-0.90	≤ 0.025	≤ 0.035	0.90-1.20	0.15-0.30

42CrMo4 Relevant Standards

USA	UK	China	Japan	France	Russia
4140	EN19/708M40	42CrMo	SCM440	42CD4	42HM

42CrMo4 Mechanical Property

Diameter d mm	≤ 16	16-40	40-100	100-160	160-250
Thickness t mm	< 8	8-20	20-60	60-100	100-160
Yield Strength Mpa	≥900	≥750	≥650	≥550	≥500
Tensile Strength Mpa	1100-1300	1000-1200	900-1100	800-950	750-900
Elongation, %	≥10	≥11	≥12	≥13	≥14
Reduction of area ,%	≥40	≥45	≥50	≥50	≥55
impact	≥30	≥35	≥35	≥35	≥35

42CrMo4 Forging

42CrMo4 forging temperature:900 – 1100°C ,cooling as slowly as possible in still air or in sand after forged.

42CrMo4 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

42CrMo4 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

42CrMo4 Application

42CrMo4 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