C55/1.0535

TOUGHENING NON-ALLOY QUALITY STEEL

NORM: PN/EN 10083-2

APPLICATION:

Steel susceptible to the parts averagely exposed on loadings and more resistant to abrasion. Such as: wheels, rims, toothed shafts, cylinders, shafts, axles, pins, eccentrics; for springs lightly exposed on loadings, etc.

TECHNOLOGICAL INFORMATION:

After soft annealing, steel becomes machinable; if normalised and soft annealed, steel becomes adjusted for the mechanical cutting.

SEMI-FINISHED PRODUCTS:

After soft annealing, steel becomes machinable; if normalised and soft annealed, steel becomes adjusted for the mechanical cutting.

MECHANICAL PROPERTIES:

Effect of the cross-section on mechanical properties
If heat treated
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	800 – 950	750 – 900	700 – 850
Yield stress Re (Rp0.2), MPa	≥ 550	≥ 490	≥ 420
Elongation, A, %	≥ 12	≥ 14	≥ 15
Reduction of area, Z, %	≥ 30	≥ 35	≥ 40
If normalised
Diameter, d, mm Thickness of the flat bar t, mm	≤ 16 ≤ 8	16 – 100 8 – 100	100 – 250 100 – 250
Ultimate tensile strength, Rm, MPa	≥ 680	≥ 640	≥ 620
Yield stress Re (Rp0.2), MPa	≥ 370	≥ 330	≥ 300
Elongation, A, %	≥ 11	≥ 12	≥ 12

Technological treatment processes:

Technological treatment processes			Possible application	Temperature, °C
Hot forming	Forging		+	(1050 – 850)
	Rolling		+	(1050 – 850)
Treatment	Heat treatment	Quenching	+	810-850/w,o
		Tempering	+	550 – 660
	Precipitation strengthening	Supersaturation	–	–
		Ageing	–	–
	Annealing	Normalising	+	825 – 885
		Soft annealing	+	(650 – 700)
Thermochemical treatment	Carburising		–	–
	Other		–	–

INTERNATIONAL STEEL GRADES: