Method for producing seamless tube
A manufacturing method and technology of seamless steel pipe, applied in the direction of metal rolling, etc.
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[0031] As described above, the method of the present invention is a method for manufacturing a seamless steel pipe by combining the ratio of cracks in the axial center (r / R) obtained from the diameter of the billet and the length of the crack in the axial center of the billet, and the ratio of cracks in the billet from The number N of rotary forgings received during the period from contacting the roll to reaching the piercing plug is adjusted within a range that simultaneously satisfies the relationships expressed by the above-mentioned formulas (1) to (3). Next, the method for manufacturing the seamless steel pipe of the present invention will be described in more detail.
[0032] 1) Crack rate in the axial center of the billet
[0033] As described above, the axial center crack ratio of the steel slab is defined by the value (r / R) obtained by dividing the axial center crack length (r) of the steel slab by the diameter (R) of the steel slab. Here, when there are a plurality ...
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