Chapter 11 Part 2. Metals and Alloys. Nomenclature of Steels. Historically, many methods for identifying alloys by their composition have been developed The commonly used schemes in this country are those developed by AISI/SAE and ASTM
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Metals and Alloys
UNS uses the AISI/SAE designation with a letter before and a “0” after the 4 digits
The letter identifies the alloy group
AISI designation has a letter and a number.
The letter describes the application
– M (high speed machine tool), H (hot working)
The letter describes the heat treatment
– A (air hardening), O (oil quenching), W (water quenching)
UNS designation – all tool steels start with a “T”
Austenite is restricted to a small region of the phase diagram
Cast iron Steel
UNS – Letter F indicates cast iron
R5xxxx – Titanium alloys