m303BÖHLER M303 HHHARD is a corrosion-resistant Cr-Mo steel, pre-hardened to approx. 1200 MPa with optimised toughness and polishability for processing corrosive mouldingBÖHLER M303 EXTRA is a corrosion-resistant, martensitic chromium steel with very good toughness, corrosion resistance, good wear resistance and improved machinability