NMV/1.2842/90MnCrV8

COLD WORK TOOL STEEL

NORM: ISO 4957

APPLICATION:

Steel susceptible to tools and measuring tools which are resistant to abrasion, guide strips, ejector pins, gauges; cutting, punching, stamping tools; long screw taps, threading dies, screw cutting jaws, broaches, circular cutters for paper and leather, cutting plates with complex shapes for blanking dies, wood processing mills, reamers, measures tools etc.

MECHANICAL PROPERTIES:

Hardness after	Tempering ºC	Symbol	Value
Soft annealing	–	HB	≤229
Quenching with 790 ºC in oil	–	HRC	65
Quenching with 790 ºC in oil and tempering	180	HRC	≥60
	200	HRC	61.5
	250	HRC	59.5
	350	HRC	57
	400	HRC	54
	450	HRC	51
	500	HRC	48
	550	HRC	44

PHYSICAL PROPERTIES:

Property	Unit	Value
Density, ρ	g*cm-3	7.85
Thermal expansion, α20-100ºC)	K-1	11.7*10-6
Thermal conductivity, λ20ºC)	W*m-1*K-1	25

Technological treatment processes:

Technological treatment processes			Possible application	Temperature, °C
Hot forming	Forging		+	1000-850
	Rolling		+	1000-850
Treatment	Heat treatment	Quenching	+	780-800
		Tempering	+	170-190
	Precipitation strengthening	Supersaturation	–	–
		Ageing	–	–
	Annealing	Soft annealing	+	680-700
		Stress relieving	+	600-680
Thermochemical treatment	Nitriding		–	–
	Other		–	–

INTERNATIONAL STEEL GRADES: