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长期在900℃高温下工作的炉板、炉条等耐热零件,除要求一定的耐热性外,还要求耐磨和一定强度。原采用高Ni—Cr钢或Fe—Al—Mn耐热钢。因上述金属缺乏且价格昂贵,决定用硅系耐热球铁代替,将终硅量定为5—6％。熔炼在2.5吨/小时热风水冷煤粉化铁炉内进行。配料为本溪铁40％、回炉料50％、废钢10％。铁水出炉温度高于1400℃。沿出铁槽冲入予热到300℃的硅铁,块度≤2mm。球化为
Long-term work in 900 ℃ high temperature furnace, furnace and other heat-resistant parts, in addition to a certain degree of heat resistance, but also requires wear and strength. The original high-Ni-Cr steel or Fe-Al-Mn heat-resistant steel. Due to the lack of the above-mentioned metal and its high cost, it was decided to replace the silicon-based heat-resistant ductile iron with the amount of final silicon being 5-6%. Smelting 2.5 tons / hour hot air cooled coal powder iron furnace. Ingredients Benxi Iron 40%, 50% back to the charge, scrap 10%. Hot metal hot temperature above 1400 ℃. Into the trough into the hot iron to 300 ℃ ferrosilicon, block size ≤ 2mm. Ball into