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一般认为,可锻铸铁的含铬量不能超过0.06%,含疏量不能超过0.25%,否则就难于退火。我厂今年四月份由于焦炭含硫量高,炉料混乱,一度曾使产品含铬高达0.6%,硫高达0.36%,退火后的产品断面呈白色、黑色、花白色、灰色,且加工困难,一敲就断。后来我们在马弗电炉及管式电炉内进行热处理试验,整理出一种新的处理工艺曲线(见图),即升温到920℃,保温58小时,然后随炉冷
It is generally believed that the chromium content of malleable iron can not exceed 0.06%, the sparse content can not exceed 0.25%, otherwise it is difficult to anneal. In April of this year, due to the high sulfur content and chaos in the charge of coke, the factory once made the product contain chromium up to 0.6% and sulfur up to 0.36%. The annealed product section is white, black, gray and gray, Knock off. Later, we conducted a heat treatment test in a muffle furnace and a tubular electric furnace to sort out a new process curve (see Fig.), That is, the temperature was raised to 920 ° C for 58 hours and then cooled with a furnace