25HM/1.7218/25CrMo4

TOUGHENING STEEL

NORM: PN/EN 10083-3

APPLICATION:

Steel with a standard tensile strength and a good weldability. Steel susceptible for automotive and aircraft components with high toughness such as axles, axle journals, turbine parts, turbine rotors.

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	Symbol	Unit	After heat treatment
Ultimate tensile strength	Rm	MPa	900–1100
Yield stress	Re (Rp0.2)	MPa	≥ 700
Elongation	A	%	≥ 12
Reduction of area	Z	%	≥ 50
Impact energy	KV	J	≥ 45
The influence of the element’s 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
Rm, MPa	800–950	700–850	650–800
Re (Rp0.2), MPa	≥ 600	≥ 450	≥ 400
A, %	≥ 14	≥ 15	≥ 16
Z, %	≥ 55	≥ 60	≥ 60
KV, J	≥ 50	≥ 50	≥ 45

Technological treatment processes:

Technological treatment processes			Possible application	Temperature, °C
Hot forming	Forging		+	(1050–850)
	Rolling		+	(1180–850)
Treatment process	Heat treatment	Quenching	+	840–900/w,o
		Tempering	+	540–680
	Precipitate strengthening	Supersaturation	–	–
		Ageing	–	–
	Annealing	Normalising	+	(860–900)
		Soft annealing	+	(680–720)
Thermochemical treatment	Carburising		–	–
	Other		–	–

INTERNATIONAL STEEL GRADES: