| 摘要 |
A reinforced dredging bucket of hardened manganese steel has an edge formed from a plurality of successively alternating, integrally cast first and second regions. The first regions consist of the main bucket metal formed from a composition consisting of 0.5 to 2 % carbon; 6 to 30 % manganese; and up to 3 % silicon, chromium, molybdenum, and vanadium, singly or in combination, the rest being iron and steel impurities. The second regions, which may project beyond the first regions to form teeth, consist of a wear-resistant material formed from 1.2 to 4 % carbon; 15 to 30 % chromium; 0.2 to 10 % manganese; 0.1 to 5 % silicon; up to 10 % nickel; and up to 10 % of elements forming carbides and/or nitrides, the rest being iron and steel impurities. |
