15crmo alloy seamless steel pipe is [1] a, which is much higher than the average performance of seamless steel tubes, steel tubes which contain Cr because this more, its high temperature resistance, corrosion resistance is not other than seamless steel on, so alloy pipe in the petroleum, chemical, electric power, boiler and other industries more extensive use. 15crmo alloy tube chemical composition Chemical composition (mass fraction) (%) C Si Mn Cr Mo Ni BV 15CrMo 0.12 ~ 0.18 0.17 ~ 0.370.40 ~ 0.70 0.80 ~ 1.10 0.40 ~ 0.55 - - -