METHOD AND DEVICE FOR SEAMLESS STEEL TUBE PRODUCTION

申请公布号：JPH10305305(A)

申请号：JP19970120660

申请日期：1997.05.12

申请公布日期：1998.11.17

申请人：

SUMITOMO METAL IND LTD

发明人：OKUI TATSUYA

分类号：B21B17/14;B21D3/14;C21D8/10;(IPC1-7):B21B17/14

主分类号：B21B17/14

摘要：PROBLEM TO BE SOLVED: To give excellent circularity to seamless steel tubes to be processed in a hot rolling mill producing set diameter of tube by means of keeping the length of average outer diameter at a specified length and by straightening the tube with a rotary straighter while it is kept at a specified temperature. SOLUTION: 3 or 4 caliber rolls are placed on roll stands in coplanar position as to be freely gap adjustable. The seamless steel tubes are produced in said rolling mill having plural numbers of roll stands set in a series. A gap between the outer diameter of the tube obtained with said rolling mill and the outer diameter of a complete round tube which is obtained when the rolling is conducted based upon the gap of the caliber rolls, is adjusted so that the gap is within a range of±2%. The tube is heat treated as prescribed and straightened by rotary straighter while the temperature thereof is 500 to 650 deg.C. The seamless steel tubes of circularity within the limits of 1% are obtained by aforesaid methods.

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