65G/1.1260/66Mn4

SPRING STEEL

NORM: GOST 14959-79

APPLICATION:

Steel susceptible to steel for small cross-section springs and leaf springs, spring with low hardenability

MECHANICAL PROPERTIES:

	Unit	Value
Hardness after thermal treatment	HB	Max. 241
Quenching in oil	Temperature	830 °C
Tempering	Temperature	470 °C
Yield stress	Re (Rp0.2), MPa	Min. 785
Ultimate tensile strength	Rm MPa	Min. 980
Elongation	A, %	Min. 8
Reduction of area	Z, %	Min. 30
Impact energy	KV, J	–
Physical properties
Property	Unit	Value
Density, ρ	g·cm-3	7.85

Technological treatment processes:

Technological treatment processes			Possible application	Temperature, °C
Hot forming	Forging		+	800 – 1180
	Rolling		+	850 – 1180
Heat treatment	Annealing	Normalising	+	810 – 830
		Soft annealing	+	640 – 680
	Heat treatment after carburising1)	Quenching	+	810 – 830
		Tempering	+	640 – 680