How to Improve the Hardness of Gray Cast Iron
As an OEM Castings Supplier , share with you. Grey Cast Iron Casting 1. Charge ratio: The method of charge ratio is pig iron + scrap steel + recharge material + recarburizer, and the nitrogen in the recarburizer is used to change the shape and length of graphite to increase the hardness of gray iron castings. 2. Control of chemical composition (1) Many smelting companies believe that sulfur is harmful. The lower the content of sulfur in molten iron, the better. In fact, this is not the case. "Silicon carbide" and "manganese-sulfur ratio" should be considered in gray iron castings. . That is, Mn=1.71S+(0.2~0.5). HT250 chemical composition table: CPSiMnTiS3~3.3≤0.121.65~2.050.7~1.1≤0.05≤0.12 (2) For low alloying, one or two alloying elements should be added. When adding, the content of carbon element should be considered and not blindly pursued hardness. 3. Overheating of molten iron For gray iron castings, increasing the temperature of molten iron within a certain