34HNM/1.6582/34CrNiMo6

TOUGHENING STEEL

NORM: PN/EN 10083-3

APPLICATION:

Steel adjusted for highly loaded parts such as crankshafts of aircraft engines, driving shafts, large-sized turbine components, gear wheels, rotors and discs of steam turbines. Also subject to impact, torsion and vibrations.

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		1200–1400
Yield stress		Re (Rp0.2)		MPa		≥ 1000
Elongation		A		%		≥ 9
Reduction of area		Z		%		≥ 40
Impact energy		KV		J		≥ 35
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		160–250 100–160
Rm, MPa	1100–1300		1000–1200		900–1100		800–950
Re (Rp0.2), MPa	≥ 900		≥ 800		≥ 700		≥ 600
A, %	≥ 10		≥ 11		≥ 12		≥ 13
Z, %	≥ 45		≥ 50		≥ 55		≥ 55
KV, J	≥ 45		≥ 45		≥ 45		≥ 45

Technological treatment processes:

Technological treatment processes			Possible application	Temperature, °C
Hot forming	Forging		+	(1050 – 850)
	Rolling		+	(1180 – 850)
Treatment	Heat treatment	Quenching	+	830-860/w,o
		Tempering	+	540 – 660
	Precipitation strengthening	Supersaturation	–	–
		Ageing	–	–
	Annealing	Normalising	+	(850 – 880)
		Soft annealing	+	(650 – 700)
Thermochemical treatment	Carburising		–	–
	Other		–	–

INTERNATIONAL STEEL GRADES: