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Air-Hardening Steel

A steel containing sufficient carbon and other alloying elements to harden fully during cooling in air or other gaseous mediums from a temperature above its transformation range. The term should be restricted to steels that are capable of being hardened by cooling in air in fairly large sections, about 2 inches or more in diameter. Same as self-hardening steel.

Alloy Steel

Steel containing significant quantities of alloying elements (other than carbon and commonly accepted amounts of manganese, silicon, sulphur and phosphorus) added to effect changes in the mechanical or physical properties.

Aluminium Killed Steel

A steel where aluminium has been used as a de-oxidising agent.


American National Standards Institute


American Petroleum Institute


American Society of Mechanical Engineers


Abbreviation for American Society for Testing Material. An organisation for issuing standard specification on materials, including metals and alloys.


A solid solution of one or more elements in face-centered cubic iron.

Austenitic Steel

Steel which, because of the presence of alloying elements, such as manganese, nickel, chromium, etc., shows stability of austenite at normal temperatures.