Abstract: Briefed in the article is the importance of the on-line heat treatment of the seam of the 30Mn2 HFW pipe. Following five different heat treatment process solutions,relevant tests are conducted,and the results analyzed,which leads to such a conclusion that for the heat treatment of the quenched seam of the 30Mn2 HFW pipe,the hi-temperature tempering + normalization process is the most appropriate one. In this case,the tempering temperature should be about 600℃,and the normalization temperature range should be 940~960℃. This heat treatment process contributes to a solid basis for over-the-length quenching-and-tempering treatment of the 30Mn2 HFW pipe,and thus eliminating the potential problem that mechanical property inconsistency of the seam might be caused,when the pipe is undergoing over-the-length quenching treatment.