A514 is a particular type of high strength steel, which is quenched and tempered alloy steel, with basic strength of 100,000 psi (100 ksi, where 1 ksi = 1,000 psi) (700 MPa). The trade name T-1 for A514 alloys is extremely common, originally trademarked by United States Steel but now owned by International Steel Group who purchased plate steel operations from USS.

A514 is primarily used as a structural steel for building construction. A closely related alloy, A517, is used for the production of high-strength pressure vessels.

The A514 and A517 standards were set by the standards organization ASTM International.



The tensile yield strength of A514 alloys is specified as at least 100 ksi (690 MPa) for thicknesses up to 2.5 inch (64 mm) thick plate, and at least 110 ksi (760 MPa) ultimate tensile strength, with a specified ultimate range of 110–130 ksi (760–900 MPa). Plates from 2.5 to 6.0 inches (64 to 152 mm) thick have specified strength of 90 ksi (620 MPa) (yield) and 110–130 ksi (760–900 MPa) (ultimate).


A517 steel has equal tensile yield strength, but slightly higher specified ultimate strength of 115–135 ksi (790–930 MPa) for thicknesses up to 2.5 inches and 105–135 ksi (725–930 MPa) for thicknesses 2.5 to 6.0 inches.


A514 steels are used where a weldable, machinable, very high strength steel is required to save weight or meet ultimate strength requirements. It is normally used as a structural steel in building construction, cranes, or other large machines supporting high loads.


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