Sichuan Liaofu Special Steel Company is one of the most experienced manufacturers and suppliers of pre-hardened hot forged 1.2738 tool steel bar in China. With over 20 years' experience, our factory offer high quality products made in China with competitive price. Welcome to contact us for wholesale service.
General Information:
This steel grade was developed to complement standard mold steel to eliminate problems such as hardness drop-off towards the middle of the mold, maching problem and inadequate etch-grainability with large sizes of more than 400mm in cross section. A significant step taken towards dealing with these problems is to increase hardenability by alloying approximately 1% nickel.
Application:
It features excellent hardening penetration, good workability, polishing and photoengraving properties. This steel 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.
Comparable Standards:
| AISI/SAE | DIN | W.Nr. | AFNOR | JIS | BS | SIAU | GB,YB |
718 (P20+Ni) | 40CrMnNiMo8-6-4 | 1.2738 | 40CMND8 | HPM1 | / | / | 3Cr2MnNiMo |
Chemical Analysis (%):
| 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 | ≤0.03 | ≤0.03 |
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 |
Heat treatment
Annealing:
Heat to 710~740°C, with hold at minimum rate for 3 hours.
Slow furnace cooling to 600°C
Stress relieving:
To be carried out after machining and before the final heat treatment.
Heating to 530~580°C for 2 hours.
Hardening:
Preheating to 500~550°C;
- Austenitizing at 840~880°C
- Oil or thermal bath cooling at 200~300°C, then oil cooling according to the steel shape and size.
Quenched hardness: HRC 52~54
Tempering:
To be carried out after hardening and when the steel is at 60~80°C, at 500~600°C according to the required
hardness and with permanence for at least 2hours; cooling in air.
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