| 摘要 |
<p>Articles (18, 38, 44, 46, 48) embodying a wear resistant surface layer (34) which are particularly suited for employ ment in a bowl mill (10) of the type that is operative for purposes of effective the pulverization therewithin of a material such as coal. Among these articles (18, 38, 44, 46, 48) that embody such a wear resistant surface layer (34) are to be found the rolls (18) which provide the grinding force that is employed for purposes of effecting the pulverization within the bowl mill (10) of material such as coal as well as the liners (44, 46, 48) that for wear resistant purposes are employed in selected regions of the interior of the bowl mill (10). As regards the rolls (18), the wear resistant surface layers (34) thereof, as cast, comprise, by weight percentages, 3.2% - 3.4% Carbon, 1.45% - 1.65% Silicon, 0.4% maximum Manganese, 4.5% - 5.0% Nickel, 4.0% - 4.25% Chromium, 0.4% -0.5% Phosphorus, 0.9% - 0.11% Sulfur, 0.4% - 0.6% Molybdenum and no Bismuth. On the other hand, insofar as the liners (44, 46, 48) are concerned, the wear resistant surface layers thereof, as cast, comprise, by weight percentages, 3.5% - 3.7% Carbon, 1.2% - 1.6% Silicon, 0.4% maximum Manganese, 4.3% -5.0% Nickel, 3.7% - 4.4% Chromium, 0.15% - 0.25% Phosphorus, 0.9% - 0.11% Sulfur, 0.4% - 0.6% Molybdenum and 0.015% nominal Bismuth.</p> |
