1.2738 | P20+Ni | 718
1.2378 low-sulphur tool steel, supplied in pre-toughened condition; due to its nickel content, it features uniform strength even with maximum plate dimensions. Ledeburitic chromium steel with high durability and cutting performance. It can be used as a tool for cutting of dynamo and transformer sheet, measuring instruments, tools for processing of plastics.
Description
1.2738 Chemical Composition
| Steel | Grade | C | Mn | P | S | Si | Cr | Mo | Ni |
| DIN | 1.2738 | 0.35-0.45 | 1.30-1.60 | ≤0.030 | ≤0.030 | 0.20-0.40 | 1.80-2.10 | 0.15-0.25 | 0.90-1.20 |
Supply Range
Surface Finish: Black, Peeled, Machined/Turned or as per given requirements.
Forged Round Bar: 20mm - 650mm (Dia)
Rolled Bars: 12mm - 360mm (Dia)
Forged flats: 30-400mm(T)*500-1200mm(W)
Rolled flats: 10-360mm(T)*30-1020mm(W)
Other sizes of O1 material or as per customer’s requirements.
Heat Treatment
Already Pre-toughened; usually no heat treatment required.
Soft annealing:
710 to 740 °C for about 2 to 5 hours; slow controlled cooling of 10 to 20 °C per hour to about 600 °C further cooling in air, max. 220 HB
Hardening:
840 to 870 °C
15 to 30 minutes keeping curing temperature
quenching in oil/hot bath/air 180 bis 220 °C
obtainable hardness: 53 HRC
Tempering:
slow heating to tempering temperature immediately after hardening; minimum time in furnace: 1 hour per 20 mm part thickness; tempering twice is recommended.
Applications
1.2738 mold steel materials are generally used for relatively low temperature applications such as die casting dies and injection moulds, synthetic plastic moulds dies, especially for large plastic moulds higly stressed in core, hydroforming tools, such as up to 400 mm in the construction of plastic moulds. And also use for large cavity plates with deep cavities for items such as bumpers or dashboards, moulding frames.
