WNLV/1.2714/55NiCrMoV7

HOT WORK TOOL STEEL

NORM: ISO 4957

APPLICATION:

Steel susceptible to die inserts for presses and upsetting machines, forging dies, hot shear knives, punches, anvils for large-size and deep-impression hammers and presses, hammer dies with average dimensions, backing plates, die holders, hot punching tools.

MECHANICAL PROPERTIES:

Hardness after	Tempering ºC	Symbol	Value
Soft annealing	–	HB	≤248
Quenching with 850 ºC in oil	–	HRC	60
Quenching with 850 ºC in oil and tempering (cooling during quenching can be in the forced air or polymer)	500	HRC	42
	350	HRC	52.5
	400	HRC	51
	450	HRC	49
	500	HRC	47
	550	HRC	44.5
	600	HRC	42

PHYSICAL PROPERTIES:

Property	Unit	Value
Density, ρ	g*cm-3	7.85
Linear expansivity, α20-100ºC)	K-1	12*10-6
Specific thermal conductivity, λ20ºC)	W*m-1*K-1	34

Technological treatment processes:

Technological treatment processes			Possible application	Temperature, °C
Hot forming	Forging		+	1100-850
	Rolling		+	1100-850
Treatment	Heat treatment	Quenching	+	840-890
		Tempering	+	500-600
	Precipitation strengthening	Supersaturation	–	–
		Ageing	–	–
	Annealing	Soft annealing	+	650-680
		Stress relieving	+	600-650
Thermochemical treatment	Nitriding		–	–
	Other		–	–

INTERNATIONAL STEEL GRADES: