AASHTO M 255M/M 255

Abstract

This specification covers hot-wrought, special quality, carbon steel bars and bar size shapes produced to mechanical property requirements and intended for general constructional applications. <br>The bars are available in nine strength grades designated 310, 345, 380, 415, 450, 485, 515, 550, and 620 [45, 50, 55, 60, 65, 70, 75, 80, and 90] corresponding to the minimum ultimate tensile strength in MPa [ksi]. The chemical composition is selected by the manufacturer to develop the required mechanical properties. <br>Hot-wrought, special quality, carbon steel bars subject to mechanical property requirements are hot wrought in straight lengths only. Sections and sizes available are covered in ASTM A 29/A 29M. <br>Some applications may require one or more of the available designations shown under Supplementary Requirements. <br><strong>Note 1</strong>&#8212;Merchant-quality hot-wrought carbon steel bars subject to mechanical property requirements are covered in M 227M/M 227. <br>This specification is applicable to orders in either SI units (as M 255M) or inch&#8211;pound units (as M 255). SI units and inch&#8211;pound units are not necessarily equivalent. Inch&#8211;pound units are shown in brackets in the text for clarity, but they are the applicable values when the material is ordered to M 255.