40H/1.7035/41Cr4

TOUGHENING STEEL

NORM: PN/EN 10083-3

APPLICATION:

Steel susceptible to crankshafts, axles, gears, levers, connecting rods, connecting elements and grinding wheels

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:

Effect of the cross-section on mechanical properties after heat treatment
Diameter d, mm Thickness of the flat bar t, mm	≤ 16 ≤ 8	16 – 40 8 – 20	40 – 100 20 – 60
Ultimate tensile strength Rm, MPa	1000 – 1200	900 – 1100	800 – 950
Yield stress Re (Rp0.2), MPa	≥ 800	≥ 660	≥ 560
Elongation, A, %	≥ 11	≥ 12	≥ 14
Reduction of area Z (%)	≥ 30	≥ 35	≥ 40
Impact energy, KV, J	≥ 30	≥ 35	≥ 35
Physical properties
Property		Unit	Value
Density, ρ		g·cm-3	~7.85
Thermal expansion α0-50°C		K-1	~11.3·10-6
Thermal conductivity coefficient λ0°C		W·m-1K-1	~48.5

Technological treatment processes:

Technological treatment processes			Possible application	Temperature, °C
Hot forming	Forging		+	(1050 – 850)
	Rolling		+	(1180 – 850)
Treatment	Heat treatment	Quenching	+	820-860/w,o
		Tempering	+	540 – 680
	Precipitation strengthening	Supersaturation	–	–
		Ageing	–	–
	Annealing	Normalising	+	(840 – 870)
		Soft annealing	+	(680 – 720)
Thermochemical treatment	Carburising		–	–
	Other		–	–

INTERNATIONAL STEEL GRADES: