DIN 1.2738 AISI P20+Ni Pre-hardened Plastic Mould Steel is a pre-hardened grade specially designed for plastic mold industry. Chromium, Molybdenum, Nickel carbon and manganese additions are optimized to have a fully martensite-bainite microstructure after quenching. The high nickel content (1%) is specially adapted to ensure a perfect homogeneity of structure and hardness through thickness even for very thick blocks.
> Uniform hardness across the cross-section.
> Good polishability.
> Good machinability.
> Hardenable and temperable plastic mould steel.
Heat Treatment:
Forge: At 900° C-1100° C Cool slowly and anneal immediatedly
Anneal: At 710° C-740° C Cool slowly in furnace
Stress Relieve: At to 530° C-580° C Cool in still air
Harden: Preheat at 500° C-550° C raise to 840° C-880° C Cool in air, iol or into salt bath held at 200° C-300° C and then air or oil cooling according to the steel shape and size.
APPLICATIONS: Mould for TV housings and rear walls, copier housings; Shock-absorber moulds; Moulds for dashboards and large outside body parts; Waste bin moulds; Pressure casting frames.
Chemical Composition(%):
C: 0.32-0.40
Si: 0.20-0.40
Mn: 1.10-1.50
P: Max. 0.030
S: Max. 0.030
Cr: 1.70-2.00
Mo: 0.25-0.40
Ni: 0.85-1.15
Cu: Max. 0.025
Common Size: Round bars: Dia. 80-600mm Plates: Thickness: 40-350mm Width: 100-1000mm, Length: 2m-6m.
Delivery condition: EAF+LF+VD+(ESR), forged, annealed, UT tested, peeled or machined.
Hardness HBW: < =240HB or 34-44 HRC
Tolerance: 0/+2mm
Forging Ratio: Min 1: 4
Surface: Rounds: Black / grinded / turned Plates: Black / milled
Surface condition: Cracks, decarburisation, burd spots and similar surface defects just within permissible tolerances.
Grain size: ASTM E112 5-8
Inclusion rating:
According to ASTM E45
TYPE A B C D
THIN 0.5-2.0 0.5-2.0 0.5-2.0 0.5-2.0
THICK 0.5-2.0 0.5-2.0 0.5-2.0 0.5-2.0
Or K4 max. 30 according to DIN 50602
UT Grade: Sep 1921-84 Group 3 Class D/d Qualified.
Delivery time: Within 40 days.
Quality assurance: ISO9001 certificated, IQNet, CQC
Kasen Steel Co., Ltd. Specializes in marketing of special steels and tool steels, which are produced in many large-scale steel factories in China, such as Wuyang Steel, Baoshan Iron & Steel, Fushun Steel, etc. The main grades of tool steels and special steels which we market are as follows:
1. Plastic Mould Steel;
2. Hot Work Die Steel;
3. Cold Work Tool Steel;
4. High Speed Tool Steel;
5. Carbon Structure Steel;
6. Special Steel;
7. Alloy Tool Steel.
