HOT WORK TOOL STEEL
NORM: ISO 4957
APPLICATION:
Steel susceptible to hot forming tools, die inserts for presses and upsetting machines, extrusion tools from light metals, forging dies, pressure casting tools, hot shear knives, tools for plastic industry and rollers for copper rolling.
CHEMICAL COMPOSITION:
| C | Si | Mn | P | S | Cr | Mo | W | V | Co | Ni |
|---|---|---|---|---|---|---|---|---|---|---|
| 0,35-0,42 | 0,80-1,20 | 0,25-0,50 | Max 0,030 | Max 0,030 | 4,80-5,50 | 1,20-1,50 | - | 0,85-1,15 | - | - |
MECHANICAL PROPERTIES:
| Hardness after | Tempering ºC | Symbol | Value |
| Soft annealing | – | HB | ≤229 |
| Quenching with 1020 ºC in oil | – | HRC | 56 |
| Quenching with 1020 ºC in oil and tempering
(cooling during quenching can be performed gradually in the salt bath at around 550 ºC and then cooled in the air) |
550 | HRC | ≥50 |
| 350 | HRC | 53 | |
| 400 | HRC | 54 | |
| 450 | HRC | 55.5 | |
| 500 | HRC | 56 | |
| 550 | HRC | 52.5 | |
| 600 | HRC | 48 | |
| 650 | HRC | 43 |
PHYSICAL PROPERTIES:
| Property | Unit | Value |
| Density, ρ | g*cm-3 | 7.79 |
| Linear expansivity, α20-100ºC) | K-1 | 10,7*10-6 |
| Specific thermal conductivity, λ20ºC) | W*m-1*K-1 | 38 |
Technological treatment processes:
| Technological treatment processes | Possible application | Temperature, °C | ||
| Hot forming | Forging | + | 1100-850 | |
| Rolling | + | 1100-850 | ||
| Treatment | Heat treatment | Quenching | + | 1010-1060 |
| Tempering | + | 480-570 | ||
| Precipitation strengthening | Supersaturation | – | – | |
| Ageing | – | – | ||
| Annealing | Soft annealing | + | 800-840 | |
| Stress relieving | + | 600-680 | ||
| Thermochemical treatment | Nitriding | + | 470-550 | |
| Other | – | – | ||
INTERNATIONAL STEEL GRADES:
|
ISO |
CEN |
Rosja |
|||
|
X40CrMoV5-1 |
ISO 4957:2004 |
X40CrMoV5-1 |
ISO 4957:2004 |
4H5MF1S |
GOST 5950-73 |
|
USA |
Japonia |
Chiny |
|||
|
H13 |
ASTM A 681-91 |
SKD 61 |
JIS G 4404-1983 |
4Cr5MoSiV1 |
GB 1299-85 |