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随着机械、冶金、化学工业的发展,对高温材料的需求迅速增加,耐热铸铁的用途也日益广泛了。耐热合金铸铁的成本远较耐热合金钢便宜,制造方法也最简便,因此,在很多埸合下,它必将逐步代替合金钢。国外,为了提高铸铁耐热性能,常加入Cr、Ni、Cu等合金元素。在我国Ni、Cr极感缺乏,Cu的价格非常昂贵,因此我国发展耐热铸铁的主要道路将是用Si、Al等来代替这些既贵又缺的合金元素。锅炉上很多零件长期在800～900℃的高温下工作,如风管接头、梳形定位钣、炉
With the development of machinery, metallurgy, chemical industry, the demand for high-temperature materials increases rapidly, and the use of heat-resistant cast iron is also increasingly widespread. Heat-resistant alloy cast iron costs much cheaper than heat-resistant alloy steel, manufacturing methods are also the most simple, therefore, in many cases, it will gradually replace the alloy steel. Abroad, in order to improve the heat resistance of cast iron, often add Cr, Ni, Cu and other alloying elements. In our country Ni, Cr extremely lacking, the price of Cu is very expensive, so the development of China’s main road of heat-resistant cast iron will use Si, Al, etc. to replace these expensive and missing alloying elements. Many parts of the boiler long-term work at 800 ~ 900 ℃ high temperature, such as duct fittings, comb positioning sheet metal, furnace