1.2311 & .P20 Plastic Mould Steel
A:Specification
| Product | Material | Spec.(mm) | Length（mm) | Remark |
| Plastic Mould Steels | 1.2311大板 | 20-75*2000 | 3000-10000 | Hot Rolled、黑皮、预硬 |
| Product | Material | Spec.(mm) | Length（mm) | Remark |
| Plastic Mould Steels | P20薄板 | 30-80*1800-2300 | 3000-10000 | Hot Rolled、黑皮、预硬 |
| Plastic Mould Steels | P20扁 | 20-45*255 | 3000-5800 | Hot Rolled、黑皮、Annealed |
B: Performance Table
| General Information |
Pre-hardened grade specially designed for the plastic mold industry deliver in hardened and tempered condition (300HB),subsequent heat treatment is not necessary. Specially employed for the plastic mold industry and adapted ford polishing and chemical(low sulphur content) |
| Comparable Standards |
AISI/SAE DIN W.N AFNOR BS SIAU |
| / 40CrMnMo7 1.2311 (35CMD7) / 2311 | |
| Chenical Analysis (%) |
C Mn Si Cr MO P S |
| 0.35-0.45 1.30-1.60 0.20-0.40 1.80-2.10 0.15-0.25 ≤0.03 ≤0.03 |
Heat Treatment
Annealing:
Heat to 720÷750℃for2÷4h furnace cool.
Stress relieving :
Up to 560÷600℃, hold for2÷4h; furnace or still air cooling.
Hardening:
Preheating to 600 ÷ 650℃;
-Heat to harding temperature to840℃÷870℃ and hold at temperature.
-Cooling in oil
Hardness after hardening: HRC 51
Tempering:
To be carried out after harding in the range 580÷650℃ for 25mmof thickness minimum 2h
Tempering Curve (only for reference):
