| 摘要 |
PROBLEM TO BE SOLVED: To provide a seam processing temperature regulation equipment line wherein martensite or bainite transformation is hard to be taken place at a seamed part of a steel pipe which is continuously draw rolled after the seam part is welded. SOLUTION: In a pipe manufacturing line, an open seam heater 3 for heating a seamed part 2 of an open pipe to a solid phase welding temperature, a squeezing device 4 for pressing/welding the seamed part, and a reducer 5 for draw rolling a pipe 1 to a given outer diameter after a seam part is joined are arranged in this order. A seam processing temperature regulation equipment line is installed between the squeezing device and the reducer for carrying out the rolling of the seamed part and the temperature regulation. In the equipment, a seam cooling device 7 for forcefully cooling the seamed part, a seam rolling device 6 for rolling the seam part, and a pipe heating device 8 for evenly heating the seamed part/base material part are arranged in this order.
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