24 July 2021 Mould Steel Bar
8Cr13 Mould Steel Bar
8Cr13 forged steel is a high wear-resistant hot forging die steel, can be used for mirror mold, high acidity after quenching, should be avoided in the range of 8Cr13 forging steel is a high wear-resistant hot forging die steel, which can be used for mirror molds. It has high acid resistance after quenching. Tempering in the range of 460~480℃ should be avoided to avoid reducing the impact toughness value, which is not conducive to molds with high toughness requirements.
Chemical Composition:
| C(％) | Si(％) | Mn(％) | P(％) | S(％) | Cr(％) |
|---|---|---|---|---|---|
| 0.76～0.85 | ≤0.35 | 0.20～0.40 | ≤0.030 | ≤0.030 | 2.80～3.20 |
Mechanical Propoerties:
| Yield Strength Rp0.2(MPa) | Tensile Strength Rm(MPa) | Impact Energy AKV(J) | Elongation at Fracture A(%) | Reduction in Cross Section on Fracture Z(%) | Impact toughness value αkv (J/cm2) | Hardness(RockWell) |
|---|---|---|---|---|---|---|
| ≥ 985(85) | ≥ 1315(100) | ≥ 78 | ≥ 12 | ≥ 55 | ≥ 98 | ≤ 56.7 HRC |
Normal annealing specification:
The temperature is 780~790℃, the steel is air cooled, and the hardness of the steel is 207~255HBS.
General quenching and tempering specifications:
Temperature 820~850℃, oil cooling or air cooling, hardness 60~62HRC, tempering temperature 460~481℃, hardness 41~45HRC
Specification for softening of cold-pressed blanks:
The temperature is 820℃±10℃, the time is 3~4h, and then it is slowly cooled to ≤600℃ at a cooling rate of 5-10℃/h, and it is air-cooled from the furnace, and the hardness is ≤255HBS.
Hot spring softening specifications such as cold-pressed wool embryos:
Temperature 820℃≤10℃, time 3~4h, cooling to temperature 720℃±10℃, time 6~8h, and then slowly cooling to ≤600℃ at a cooling rate of 5-10℃/h, air cooling from furnace, hardness ≤255HBS .
Application:
- Mainly used for hot forging dies.
- Using the steel billet high temperature tempering and softening process, it can be used for small hot work die billet thickness <300mm, and the softening treatment of old molds before refurbishment
Suitable for plastic food mold steel such as PVC, PP, EP, PC, PMMA, etc.