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AASHTO M 270M/M 270-08 Standard Specification for Structural Steel for Bridges
standard by American Association of State and Highway Transportation Officials, 08/01/2008
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This specification covers carbon and high-strength low-alloy steel structural shapes, plates, and bars and quenched-and-tempered alloy steel for structural plates intended for use in bridges. Nine grades are available in four yield strength levels.When the steel is to be welded, it is presupposed that a welding procedure suitable for the grade of steel and intended use or service will be utilized. See Appendix X3 of M 160M/M 160 for information on weldability.