Title:
SKEW ROLLING METHOD OF SEAMLESS STEEL TUBE
Document Type and Number:
Japanese Patent JPH04319006
Kind Code:
A
Abstract:
PURPOSE: To prevent the generation of the outside surface flaw and inside surface flaw of rolled stock by reducing slip between rolls and a material to be rolled in a Mannesmann type inclined piercer.
CONSTITUTION: Rolling is executed by controlling so that the surface roughness in the circumferential direction of rolls of the inclined piercer is maintained between 5-40μm in the arithmetic mean deviation Ra of profile and also the average peak interval DHS of ruggedness is in the range of 30-850μm.
Inventors:
YORIFUJI AKIRA
MORIOKA NOBUHIKO
MORIOKA NOBUHIKO
Application Number:
JP8504691A
Publication Date:
November 10, 1992
Filing Date:
April 17, 1991
Export Citation:
Assignee:
KAWASAKI STEEL CO
International Classes:
B21B19/04; B21B27/00; B21B27/02; (IPC1-7): B21B19/04; B21B27/00; B21B27/02
Attorney, Agent or Firm:
Yoshio Kosugi (1 person outside)