Accession Number : ADA299291

Title :   Development of High Performance Steels for Bridge Construction.

Descriptive Note : Research and development rept. Aug 94-May 95,

Corporate Author : NAVAL SURFACE WARFARE CENTER CARDEROCK DIV BETHESDA MD

Personal Author(s) : Focht, Eric M. ; Montemarano, Thomas W.

PDF Url : ADA299291

Report Date : AUG 1995

Pagination or Media Count : 37

Abstract : High strength steels that are used in bridge construction (ASTM A709) have yield strengths in the 50 to 100 ksi range and allow for carbon levels to reach as high as 0.23 wt.%. For good weldability, the carbon content in HSLA steels used by the Navy is usually restricted to a maximum of 0.10 wt.%. The Navy is working with industry to develop new high performance steels for bridges with improved weldability and toughness at the 480 MPa and 690 MPa yield strength levels. The experimental steels developed by the Navy had a maximum allowable carbon content of 0.10 wt.% and low alloying levels for good weldability and high low-temperature toughness. The chemical compositions were designed to meet the weathering requirements of ASTM GlOl. Processing techniques such as recrystallization controlled rolling, controlled rolling, accelerated cooling and direct quenching were employed to achieve good mechanical properties and weldability. (AN)

Descriptors :   *HIGH STRENGTH ALLOYS, *CARBON STEELS, *LOW ALLOY STEELS, THERMOMECHANICS, TENSILE STRENGTH, MILITARY REQUIREMENTS, MICROSTRUCTURE, CRACKING(FRACTURING), FABRICATION, TOUGHNESS, AUSTENITE, QUENCHING, HEAT TREATMENT, YIELD STRENGTH, COMPOSITION(PROPERTY), ACCELERATED TESTING, TEMPERING, RECRYSTALLIZATION, BRIDGES, VANADIUM, WEATHERING, ROLLING(METALLURGY), WELDABILITY, MARTENSITE, STRUCTURAL STEEL.

Subject Categories : Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE