| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.2 ( March 1981 ) ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| An Outline of 26-inch Mill and Quality of Pipes
Toshihisa Tamura, Yasutoshi Hosokawa, Yuzo Yoshimoto, Fumiaki Ode, Hiroaki Kondo, Masao Kurosaki, Iwaki Sugimoto |
| Synopsis : A 26-inch ERW mill, one of the largest of its kind in the world, has been satisfactorily producing up to 26", (660.4mm) pipes in outside diameter with 0.63", (16mm) in maximum wall thickness since Oct. 1978 at Chita Works, Kawasaki Steel Corp. The quality of the welding parts of the pipe was stabilized by increasing the mill rigidity and adopting the full-cage roll forming method. Annealing condition of welded seam was also improved by increasing the capacity of seam-annealer and automatically controlling the annealing temperature, the seam-annealer gap and the annealer's movement to follow the seam. Furthermore, ultrasonic testing machines with 6 probes for seam portion and with rotary probes for lamination were installed to make the quality assurance system perfect. Mechanical properties of line-pipe with high tensile strength satisfied API standards. |
| TextiPDF: 12p./526kbj |