COLD WORK TOOL STEEL FOR MOULD BASES
NORM: ISO 4957
APPLICATION:
Steel susceptible to dies, casting, plastic moulds large bending and cutting tools, anvils blocks, shredder knives, mould for coinings, cutting tools for thick steel semi-finished products, some tools for hot forming of the alloys that contains non-ferrous metals, shear knives for cutting billets and scrap, plastic moulds exposed to high pressures. It is suitable for surface texturing and electrolytic machining, rams, drop balls, shear blades etc.
CHEMICAL COMPOSITION:
| C | Si | Mn | P | S | Cr | Mo | W | V | Co | Ni |
|---|---|---|---|---|---|---|---|---|---|---|
| 0,40-0,50 | 0,10- 0,40 | 0,20-0,50 | Max 0,030 | Max 0,030 | 1,20- 1,50 | 0,15-0,35 | - | - | - | 3,80- 4,30 |
MECHANICAL PROPERTIES:
| Hardness after | Tempering ºC | Symbol | Value |
| Soft annealing | – | HB | ≤285 |
| Quenching with 850 ºC in oil | – | HRC | 56 |
| Quenching with 850 ºC in oil and tempering
(cooling during quenching can be performed either in the air or gradually in the salt bath at 180–220 ºC and then cooled in the air) |
180 | HRC | ≥52 |
| 200 | HRC | 53.5 | |
| 250 | HRC | 52 | |
| 400 | HRC | 47 | |
| 450 | HRC | 44.5 | |
| 500 | HRC | 42 | |
| 550 | HRC | 40 | |
| 600 | HRC | 37 |
PHYSICAL PROPERTIES:
| Property | Unit | Value |
| Density, ρ | g*cm-3 | 7.85 |
| Thermal expansion, α20-100ºC) | K-1 | 12.1*10-6 |
| Thermal conductivity, λ20ºC) | W*m-1*K-1 | 30 |
Technological treatment processes:
| Technological treatment processes | Possible application | Temperature, °C | ||
| Hot forming | Forging | + | 1050-850 | |
| Rolling | + | 1050-850 | ||
| Treatment | Heat treatment | Quenching | + | 840-870 |
| Tempering | + | 160-250
500-600 |
||
| Precipitation strengthening | Supersaturation | – | – | |
| Ageing | – | – | ||
| Annealing | Soft annealing | + | 610-650 | |
| Stress relieving | + | 550-650 | ||
| Thermochemical treatment | Nitriding | + | 470-540 | |
| Other | – | – | ||
INTERNATIONAL STEEL GRADES:
|
ISO |
CEN |
Russia |
|||
| 45NiCrMo16 | ISO 4957:2004 | 45NiCrMo16 | ISO 4957:2004 | – | – |
| US | Japan | China | |||
| – | – | – | – | – | – |