COLD WORK TOOL STEEL

NORM: ISO 4957

APPLICATION:

Steel susceptible to tools with a high surface hardness and tough core, dies and punches for cold metal forming, plastic moulds.

CHEMICAL COMPOSITION:

CSiMnPSCrMoWVCoNi
0,18-0,240,15-0,351,10-1,40Max 0,030Max 0,0301,00 - 1,30-----

MECHANICAL PROPERTIES:

Hardness after Tempering ºC Symbol Value
Soft annealing HB ≤217
Quenching1) with 820 ºC in water HRC 62
Quenching1) with 820 ºC in water and tempering

1) after carburising

180 HRC ≥60
200 HRC 60
250 HRC 58.5
300 HRC 57
350 HRC 55
400 HRC 53.5
450 HRC 52
500 HRC 50.5

PHYSICAL PROPERTIES:

Property Unit Value
Density. ρ g*cm-3 7.85
Thermal expansion. α20-100ºC) K-1 11.9*10-6
Thermal conductivity. λ20ºC) W*m-1*K-1 52

Technological treatment processes:

Technological treatment processes Possible application Temperature. °C
Hot forming Forging + 1100-850
Rolling + 1100-850
Treatment Heat treatment Quenching + 810-830
Tempering + 170-190
Precipitation strengthening Supersaturation
Ageing
Annealing Softening + 660-700
Stress relieving + 600-680
Thermochemical treatment Nitriding 880-950
Other 880-920

INTERNATIONAL STEEL GRADES:

ISO EN Russia
21MnCr5 ISO 4957:1999 21MnCr5 EN ISO 4957:1999
US Japan China