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.

CHEMICAL COMPOSITION:

CSiMnPSCrMoWVCoNi
0,5-0,60,10-0,400,60 - 0,90MAX 0,03MAX 0,030,80-1,200,35-0,55-0,05-0,15-1,50-1,80

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:

ISO EN Russia
55NiCrMoV7 ISO 4957:2004 55NiCrMoV7 ISO 4957:2004 ~5HNM GOST 5950-73
US Japan China
~L6 ASTM A 681-91 ~SKT 4 JIS G 4404-1983 ~5CrNiMo GB 1299-85