m303Standard Specification for Lime for Asphalt Mixtures AASHTO Desnation: M 303-89 (2019) Technical Subcommittee: 3a, Hydraulic Cement and Lime Release: Group 1 (April) AASHIOBÖHLER M303 EXTRA is a corrosion-resistant, martensitic chromium steel with very good toughness, corrosion resistance, good wear resistance and improved machinability and polishability. Compared to 1.2316, BÖHLER M303 EXTRA