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.

CHEMICAL COMPOSITION:

CSiMnPSCrMoWVCoNi
0,85-0,950,10-0,401,80-2,20Max 0,030Max 0,0300,20-0,50--0,05-0,20--

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:

ISO EN Russia
90MnCrV8 ISO 4957:2004 90MnCrV8 ISO 4957:2004 9G2F GOST 5950-73
US Japan China
O2 ASTM A 681-91 9MnV GB 1299-85