Improvements in or relating to annealed steel sheets and to hacksaw blades made fromsuch sheets

摘要

Annealed sheets, particularly for making hack-saw blades, are made from steel containing 3-12 per cent of chromium and 2-12 per cent of tungsten, with or without up to 3 per cent of vanadium, and containing also embedded abrasive nodules of cementite. The carbon content may be 0,7-1,3 per cent. The sheets are annealed at about 1425-1475 DEG C. for about 18 hours, cooled slowly, and cut into blades which are hardened by heating just above the critical point and quenching in oil, and are afterwards tempered. Specification 269,488, [Class 82 (i), Metals, Extracting &c.], is referred to.