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高压操作是现代高炉冶炼取得高产、稳产、低耗的重要手段之一。对双钟炉顶装置,要提高顶压,必须解决料钟、料斗的耐磨、耐冲击及密封问题。通常,首钢用“堆667”做为料钟、料斗接触面上的堆焊合金,它只能在500℃以下正常工作,不能适应首钢的生产要求。新研制成功一种加入硼、钼、钴、的高铬合金铸铁,牌号“堆657”,具有良好的高温硬度及其它特性。在600℃时比原来“堆667”的硬度提高48％。通过在两座高炉上两年多的生产实践,证明使用新堆焊材料的小料钟寿命比用“堆667”者延长一倍,为提高顶压、减少高炉休风提供有利条件。
High-pressure operation is one of the important means to achieve high yield, stable yield and low consumption in modern blast furnace smelting. On the double bell roof device, to increase the top pressure, we must solve the material bell, hopper wear, impact and sealing problems. Typically, Shougang “heap 667” as the material bell, hopper contact surface surfacing alloy, it can only work properly below 500 ℃, Shougang can not meet the production requirements. Newly developed a successful addition of boron, molybdenum, cobalt, high chromium alloy cast iron, grade “heap 657”, has good high temperature hardness and other characteristics. At 600 ° C, the hardness of the “stack 667” was increased by 48% compared to the original. Through more than two years’ production practice on two blast furnaces, it was proved that the service life of small chimes using new welding materials is doubled compared with that of “heap 667”, which provides favorable conditions for increasing the jacking pressure and reducing blast off.