C67/1.1231

HOT ROLLED SPRING STEEL

NORM: PN/EN 10132-4:2002U

APPLICATION:

Steel susceptible for the flat springs thick up to 6 mm, spring plates etc.

MECHANICAL PROPERTIES:

Mechanical steel properties after annealing or annealing and finished rolling for the product with thickness of 0.3 mm ≤ t < 3 mm
Property			Symbol		Unit		After heat treatment
Ultimate tensile strength			Rm		MPa		≤ 510
Yield stress			Re (Rp0.2)		MPa		≥ 640
Elongation			A		%		≥ 16
Reduction of area			Z		%		–
Hardness			HV		HV		≤ 200
Mechanical steel properties after cold rolling for the products with thickness of 0.3 mm ≤ t < 3 mm
Property			Symbol		Unit		Value
Ultimate tensile strength			Rm		MPa		≤ 1140
Hardness			HV		HV		≤ 315
Mechanical steel properties after toughening for the product with thickness of 0.3 mm ≤ t < 3 mm
Property			Symbol		Unit		Value
Ultimate tensile strength			Rm		MPa		1200 – 1700
Hardness			HV		HV		370-580
Effect of the cross-section on steel mechanical properties after 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		+	(1180 – 850)
Treatment	Heat treatment	Quenching	+	815-845/w,o
		Tempering	+	(300 – 500)
	Precipitation strengthening	Supersaturation	–	–
		Ageing	–	–
	Annealing	Normalising	+	(800 – 830)
		Soft annealing	+	(650 – 690)
Thermochemical treatment	Carburising		–	–
	Other		–	–

INTERNATIONAL STEEL GRADES: