Guangzhou Changfeng Steel Co., LTD
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1.2738 718 P20+Ni Prehardened Special tool Die steel block For Injection Mold
1.2738 718 P20+Ni is used for plastic moulds of medium and big size. It can be subject to a nitriding treatment to improve it's wear resistance. Injection and thermoplastic extrusion moulds, rubber moulds, mould carrier frames, containers.
1. Features
A. uniform hardness qualitative of Material;
B. No quenching crack danger,Without heat treatment costs that can reduce the tool cost;
C. Excellent polishing performance;
D. Good machining performance;
2. Application
A. The Organic chemical process parts contains chloride, especially in the use of acid chloride catalyst.
B. The digester and bleacherin the use of paper pulp and paper making industry.
C. Absorption tower, re-heater,gas import board, fan, blender, fair water fin, flue and so on for using in flue gas desulfurization system.
D. The equipment and parts in the use of acidic gas environments.
E. Acetic acid and anhydride reaction generator
F. Sulfur acid cooling
3. Grade
| GB | AISI | DIN |
| 3Cr2NiMnMo | P20+Ni | 1.2738 |
4. Chemical composition(%)
| C | Mn | Si | Cr | Ni | Mo | P | S |
| 0.35-0.45 | 1.30-1.60 | 0.20-0.40 | 1.80-2.10 | 0.90-1.20 | 0.15-0.25 | ≤0.035 | ≤0.035 |
5. Mechanical Properties:
| Hardness | Y.S.(0.2%) | UTS | Elongation | RoA | Elastic Modulus | |||
| HB | Mpa | KSI | Mpa | KSI | % | Z% | GPA | KSI |
| 300 | 826 | 120 | 993 | 145 | 17 | 59 | 205 | 29745 |
6. Hardness:33-37HRC
7. The process flow
1) Hot rolled or forged condition, Pre-harden &tempering , black surface
2) Hardness:30~36HRC
3) Hot rolled technology:EAF+LF+VD
Forged technology:EAF+LF+VD+ESR+Forging +QT + Machined surface
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