NEW U-O LARGE SIZE WELDED PIPE MILL AT KASHIMA STEEL WORKS.

The Large Size Welded Pipe Mill constructed at the Kashima Steel Works is described. This new mill, started up in Octorber 1974, has a monthly capacity of 30. 000 to 50,000 metric tons in its first stage, and produces excellent quality line pipe. Main features of the mill include: (1) Max Dimension is 64 double prime O. D. 1250 double prime W. T. for X-65; (2) High productivity and excellent weld quality obtained by continuous tack-welding with Ar plus CO//2 welding and submerged arc welding with three wires for inside and outside; and (3) The on-line oriented computer system widely used for Quality-Control and Manufacturing-Process-Control.