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我厂用于高温炉内的耐热构件绝大部分是采用镍铬奥氏体耐热钢制作的,其中X18H25C2占84%。我国镍铬资源较少,特别是镍非常稀缺,目前几乎完全依靠进口,由于国家工业化的迅速发展,合金钢产量及其它需用镍铬的项目日益增多,因此在耐热钢中节约镍铬,尤其是寻求不含镍铬且具有高耐热性能的新品种铸铁,代替耐热钢将有很大的现实意义。我们根据一些文献介绍曾经选择了高硅球墨耐热铸铁,并作了一系列试验,其结果证明此种铸铁在950℃高温下工作有足够的强度和抗氧化性能,且铸造及加工性能与一般铸铁相似。我们在试验当中也遇到一些工艺方面的问题,为了即时与兄弟厂交流经验,兹将试验情况报导如下:
Most of our heat-resistant components used in high-temperature furnaces are made of Ni-Cr-austenitic heat-resistant steel, of which X18H25C2 accounts for 84%. China’s nickel-chromium resources less, especially nickel is very scarce, at present almost entirely dependent on imports, due to the rapid development of national industrialization, alloy steel production and other needs of nickel-chromium project is increasing, so the heat-resistant steel to save nickel-chromium, In particular, it is of great practical significance to seek a new type of cast iron that does not contain nickel-chromium and has high heat resistance, instead of heat-resisting steel. According to some documents we have selected high-silica heat-resistant ductile iron, and made a series of tests, the results show that the cast iron at 950 ℃ high temperature work have sufficient strength and oxidation resistance, and casting and processing properties and general Cast iron is similar. We also encountered some technical problems during the trial. In order to exchange experiences with our brothers immediately, we will report the following test results: