40HM/1.7225/42CrMo4

TOUGHENING STEEL

NORM: PN/EN 10083-3

APPLICATION:

Steel susceptible to very loaded axles, shafts, crankshafts. Also subject to variable bending and torsional loads, gears, , etc.

TECHNOLOGICAL INFORMATION:

After soft annealing steel becomes machinable ( by improved shearability) and adjusted for the mechanical cutting.

SEMI-FINISHED PRODUCTS:

After soft annealing steel becomes machinable ( by improved shearability) and adjusted for the mechanical cutting.

MECHANICAL PROPERTIES:

Mechanical properties of a product with diameter d ≤ 16 mm
Property		Designation		Unit		After heat treatment
Ultimate tensile strength		Rm		MPa		1100-1300
Yield stress		Re (Rp0,2)		MPa		≥ 900
Elongation		A		%		≥ 10
Reduction of area		Z		%		≥ 40
Impact energy		KV		J		≥ 30
Effect of the cross-section on mechanical properties
Diameter d, mm Thickness of the flat bar t, mm	16 – 40 8 – 20		40 – 100 20 – 60		100 – 160 60 – 100		160 – 250 100 – 160
Rm, MPa	1000 – 1200		900 – 1100		800 – 950		750 – 900
Re (Rp0.2), MPa	≥ 750		≥ 650		≥ 550		≥ 500
A, %	≥ 11		≥ 12		≥ 13		≥ 14
Z, %	≥ 45		≥ 50		≥ 50		≥ 55
KV, J	≥ 35		≥ 35		≥ 35		≥ 35

Technological treatment processes:

Technological treatment processes			Possible application	Temperature, °C
Hot forming	Forging		+	(1050 – 850)
	Rolling		+	(1180 – 850)
Treatment	Heat treatment	Quenching	+	82–860/w,o
		Tempering	+	540 – 680
	Precipitation strengthening	Supersaturation	–	–
		Ageing	–	–
	Annealing	Normalising	+	(840 – 880)
		Soft annealing	+	(680 – 720)
Thermochemical treatment	Carburising		–	–
	Other		–	–

INTERNATIONAL STEEL GRADES: