50HS/1.5026/56Si7

SPRING STEEL

NORM: PN/EN 10132-4:2002U

APPLICATION:

Steel susceptible to different types of springs ( up to 6 mm ) as leaf springs, helical springs and coil springs etc.

MECHANICAL PROPERTIES:

Mechanical properties after the process of annealing or annealing and rolling for the product with thickness of 0.3 mm ≤ t < 3 mm
Property			Symbol			Unit		After heat treatment
Ultimate tensile strength			Rm			MPa		≤ 600
Yield stress			Re (Rp0,2)			MPa		≥ 740
Elongation			A			%		≥ 12
Percentage reduction of area			Z			%		–
Hardness			HV			HV		≤ 230
Mechanical properties after the process of cold rolling for the product thickness of 0.3 mm ≤ t < 3 mm
Property			Symbol			Unit		Value
Tensile strength			Rm			MPa		–
Hardness			HV			HV		–
Mechanical properties after the process of toughening for the product thickness of 0.3 mm ≤ t < 3 mm
Property			Symbol			Unit		Value
Ultimate tensile strength			Rm			MPa		1200 – 1700
Hardness			HV			HV		370-520
Effect of the cross-section on mechanical properties after the process of toughening
Thickness, mm	0.3 ≤ 0.5	0.5 ≤ 0.75		0.75 ≤ 1	1 ≤ 1.5		1.5 ≤ 2		2 ≤ 3
Hardness HV	485-535	465-515		455-505	445-495		425-475		415-465

Technological treatment processes:

Technological treatment processes			Possible application	Temperature, °C
Hot forming	Forging		–	–
	Rolling		+	(900 – 830)
Treatment	Heat treatment	Quenching	+	840-870/w,o
		Tempering	+	430 – 500
	Precipitation strengthening	Supersaturation	–	–
		Ageing	–	–
	Annealing	Normalising	+	(850 – 880)
		Soft annealing	+	(640 – 680)
Thermochemical treatment	Carburising		–	–
	Other		–	–

INTERNATIONAL STEEL GRADES: