B - Operations – Transporting – 24 – C
Patent
B - Operations, Transporting
24
C
241/142, 57/21
B24C 11/00 (2006.01)
Patent
CA 1119822
ABSTRACT OF THE DISCLOSURE A method for beneficiating scarfer spittings to produce metallic abrasives useful in blast cleaning metallic and non-metallic surfaces includes: separating all the foreign matter from the scarfer spittings; separating the plus 1/4 inch (6.35 mm) spittings from the minus 1/4 inch (6.35 mm) spittings; treating the minus 1/4 inch (6.35 mm) spittings in a grinding mill to remove brittle shells of iron oxides from the surfaces of metallic cores; separating the iron oxides from the metallic cores and size-grading the metallic cores . The metallic cores are characterized by having a microstructure of untempered lath-like martensite substan- tially free from intergranular and intragranular cracking, a hardness of Rc 20 to 35, a grain size of between about 3 and 4, and an impact toughness at least equivalent to commercially available metallic abrasives.
303978
Bethlehem Steel Corporation
Goudreau Gage & Associates
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