50HF/1.8159/51CrV4

SPRING STEEL

NORM: PN-EN 10132-4

APPLICATION:

Steel susceptible to parts for general mechanical engendering, axles, shafts, automotive and gear parts, crankshafts, connecting-rods of engines; surface hardened for parts with high strength cores

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 the diameter d ≤ 16 mm
Property		Symbol		Unit		After heat treatment
Ultimate tensile strength		Rm		MPa		1100-1300
Yield stress		Re (Rp0,2)		MPa		≥ 900
Elongation		A		%		≥ 9
Reduction of area		Z		%		≥ 40
Impact energy		KV		J		≥ 30
Effect of the 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	1000 – 1200		900 – 1100		850 – 1000		800 – 950
Re (Rp0,2), MPa	≥ 800		≥ 700		≥ 650		≥ 600
A, %	≥ 10		≥ 12		≥ 13		≥ 13
Z, %	≥ 45		≥ 50		≥ 50		≥ 50
KV, J	≥ 30		≥ 30		≥ 30		≥ 30

Technological treatment processes:

Technological treatment processes			Possible application	Temperature, °C
Hot forming	Forging		+	(1050 – 850)
	Rolling		+	(1180 – 850)
Treatment	Heat treatment	Quenching	+	820-870/w,o
		Tempering	+	540 – 680
	Precipitation hardening	Supersaturation	–	–
		Ageing	–	–
	Annealing	Normalising	+	(850 – 880)
		Soft annealing	+	(640 – 680)
Thermochemical treatment	Carburising		–	–
	Other		–	–

INTERNATIONAL STEEL GRADES: