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Is P20+Ni (plastic mould tool steel) harder than P20+S?

September 27, 2011

My question is regarding to hardness of the PMS i.e. Is P20+Ni (Plastic moulded tool steel) harder than P20+S (Plastic moulded tool steel)?

Please also explain the technical reasons if possible.

Kind Regards,

Aftab Ahmed
student - Hyderabad, Sindh, Pakistan

Hi, Aftab.

This is outside of my area of expertise, but a vendor datasheet says the +Ni has 1% nickel, and is ideal for mirror polishing whereas the +S is not recommended when mirror polishing is required. The data sheet, however, says that the +S is supplied prehardened to 37-43 HRC whereas the +Ni is supplied prehardened to 28-32, or hardened to 33-38 HRC.

Regards,

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
September 27, 2011

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