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本文指出材料的含碳量和运行后材料组织的中二次碳化物平均尺寸（或硬度）对 ＨＫ－４０钢炉管寿命的影响很大，而晶界块状σ 相则无明显的影响；证明了 Ｋ—Ｄ 参数法外推更适用于 ＨＫ－４０钢；给出推算 ＨＫ－４０钢转化炉管剩余寿命的经验 公式：
This paper points out that the carbon content of the material and the mean secondary carbide size (or hardness) of the material after the operation have a great influence on the life of the tube of HK-40 steel and the sigma phase of the grain boundary has no obvious effect. It is proved that the K-D parameter method extrapolation is more suitable for HK-40 steel; the empirical formula for estimating the remaining life of HK-40 steel converter tube is given: