Abstract: At present R & D of the fire-resistant seamless steel pipe is almost a gap to be filled.Elaborated in the article is the efforts in R & D of such pipe as made by Pangang Group Chengdu Steel and Vanadium Co.,Ltd.The research involves such an approach that relevant micro-alloy elements are added into the low carbon-manganese steel,and then solid solution strengthened and segregated under high temperature and well-controlled finalrolling temperature to form the ferrite+pearlite+granular bainite hi-temperature resistant structure.As a result,the fire-resistant seamless steel pipe for building service with satisfactory properties is successfully trial-produced.