由于生铁和废钢铁都便宜，又因为不需要昂贵的精炼过程，和钢相比铸铁是一种廉价材料。
Since pig iron and scrap are cheap, and because there is no expensive refinement process, cast iron is a low cost material compared with steel.
本发明涉及一种精炼炉铸铁型水冷炉盖，炉盖以铸件代替焊接件。
The invention relates to a cast iron type water-cooling furnace cover of a refining furnace, which adopts a casting instead of a welding part.
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