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宝钢高炉由于压力高(鼓风压力4.218×10~5Pa)、铁水温度大于1500℃,出铁时铁口流量最高可超过10t/min。为了可靠地封堵铁口和保证高炉运行中的泥包完整,使铁口深度维持在规定深度3.2m以上,必须采用焦油含量达20%的刚玉质无水炮泥封堵铁口,显然增加开铁口钻头的磨损。引进的日本开铁口钻头,既要消耗宝贵的外汇,而且钻头属消耗品,一旦备件紧张,将影响到高炉生产。为此,在剖析日本钻头的基础上,通过硬化层的微量元素微区
Baosteel blast furnace due to high pressure (blast pressure 4.218 × 10 ~ 5Pa), the hot metal temperature is greater than 1500 ℃, tapping iron flow when the maximum can exceed 10t / min. In order to reliably block the taphole and ensure that the integrity of the blast furnace in operation, so that the depth of the taphole maintained at a predetermined depth of 3.2m or more, the use of corundum anhydrous taphole with a tar content of up to 20% Open iron mouth drill wear. The introduction of Japan to open the iron mouth bit, it is necessary to consume valuable foreign exchange, and the drill is a consumable, once the spare parts tension, will affect the blast furnace production. To this end, based on the analysis of Japanese drill bit, through the hardened layer micro-micro-area