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随着高炉热风温度的提高,在高炉上应用的一般铸铁或铸钢风管会产生氧化掉皮、变形、烧红、烧穿等现象,给进一步提高热风温度造成了困难。为克服提高风温的这一障碍,苏联采用双层钢板制成风管,内管为耐热合金钢板,管壁间填塞石棉、渣棉、水渣、或轻质耐火材料,以起耐温隔热作用。1956年末,我国某些钢铁厂也开始使用双层风管,内管用耐热钢板焊接成,但风管破坏情况并未获得多大改善。
With the increase of blast furnace hot blast temperature, ordinary cast iron or cast steel ducts applied to the blast furnace will produce oxidative peeling, deformation, burning red and burning through, which will cause difficulties to further increase hot blast temperature. In order to overcome this obstacle to increase the air temperature, the Soviet Union made double-layer steel duct, the inner tube of heat-resistant alloy steel, pipe wall filled with asbestos, slag wool, slag, or light refractory, Thermal insulation. At the end of 1956, some steel mills in China started to use double-layer ducts. The inner pipes were welded with heat-resistant steel plates, but the damage to ducts did not get much improvement.