P20 - 1.2312 datasheet

Features and Uses of P20 Mould Steel

Supplied pre-hardened to approximately 30 HRc P20 is capable of being readily machined and give a good polished finish. One of the benefits of being supplied pre-hardened is this the risk of distortion or cracking during heat treatment is eliminated. It is readily carburised or nitrided to develop a high surface hardness whilst retaining a tough core.

P20 is suited for the production of zinc die casting dies and plastic moulds as well as die holders, backers, bolsters etc.

Available Forms

Metric Pre-Machined Bar (1030)

Working and Heat Treatment

Stress Relieving

When tools are heavily machined, ground or otherwise subjected to cold work, the relief of internal strains is may be advisable. in such cases the tools should be heated uniformly to 550°C and allowed to cool in still air.

Hardening

Where tools of a higher hardness are required the material may be hardened as follows:

Heat uniformly at 830/860°C and allow to soak for 30 min.

Quench in oil and double temper to the required hardness.

Tempering

Temper according to the required hardness allowing 1 hour per 25 mm of thickness, cool in still air.

Temperature °C	200	300	400	500	600
Hardness HRc	48/49	46/47	44/45	39/41	34/36

Carburising

Carburise at 850/880°C for sufficient time to give the required case depth (see graph). Cool to 800/820°C and quench in oil.

Double temper as below to achieve the required surface hardness:

Temperature °C	320	370	420	450
Surface Hardness HRc	59/61	56/58	54/56	52/54

Nitriding

After finish machining P20 can be conventionally nitrided to give a hard, abrasion resistant surface skin to a depth of up to 0.4 mm.

Contacts

Telephone: + 44 (0) 114 249 1414
FAX: + 44 (0) 114 243 0171
Postal address: Newhall Road, Sheffield, S9 2QL, England
Electronic mail

See the list of distributors on the contacts page for your local supplier

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