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Patent Searching and Data


Title:
MANUFACTURE OF SEAMLESS STEEL TUBE
Document Type and Number:
Japanese Patent JPH0466207
Kind Code:
A
Abstract:

PURPOSE: To prevent degradation and variance of the inner skin by keeping the velocity ratio of mandrel bar in a specified velocity ratio by an equation at the time of skew/elongating rolling using a mandrel bar.

CONSTITUTION: A tube stock 3 into which the mandrel bar 2 is inserted is made to be bitten into main rolls 1, 1. And, when the tube stock 3 is bitten into the main rolls 1, 1, degradation and variance of the inner skin can be prevented and the good inner skin can be stably obtained by rolling while keeping the velocity ratio (ka) of the mandrel bar 2 by the equation ≥0.3.


Inventors:
TSUMURA SADAYOSHI
URAYAMA TAKESHI
SATO TOSHIYUKI
Application Number:
JP17659590A
Publication Date:
March 02, 1992
Filing Date:
July 03, 1990
Export Citation:
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Assignee:
SUMITOMO METAL IND
International Classes:
B21B19/02; B21B19/06; (IPC1-7): B21B19/02
Attorney, Agent or Firm:
Yoshihisa Oshida