Title:
MANUFACTURE OF COMPOSITE SULFUR FREE-CUTTING STEEL
Document Type and Number:
Japanese Patent JP3389439
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method about a method for preventing surface defect and improvement of machinability as to the method for manufacturing composite sulfur free-cutting steel from a middle cross-sectional bloom.
SOLUTION: This method is for manufacturing the composite sulfur free- cutting steel and, after taking the shape of the cast bloom as a square or a rectangle, continuously casting and cutting, blooming rolling is executed to the bloom for bar steel by 2-4 passes so that an elongation ratio becomes 1.6-2.8 and, after that, rolled into steel bars and wire rods. In the relation with the thickness of the cast bloom, after adjusting T.O in molten steel so as to satisfy the equation: 0.22D+68≤T.O≤0.22D+118 (In the equation, the thickness of the cast bloom is expressed by Dmm and the concentration of total oxygen in the molten steel by T.O ppm.), and executing continuous casting, the bloom is cut, the blooming rolling is executed and, after that, the bloom is rolled into the steel bars and wire rods.
More Like This:
Inventors:
Ken Sugawara
Yasuo Kinomoto
Takashi Yoshioka
Koichi Isobe
Yasuo Kinomoto
Takashi Yoshioka
Koichi Isobe
Application Number:
JP1215597A
Publication Date:
March 24, 2003
Filing Date:
January 27, 1997
Export Citation:
Assignee:
Nippon Steel Corporation
International Classes:
B21B3/00; B21B1/16; B22D11/00; C22C38/00; C22C38/60; (IPC1-7): B21B3/00; B21B1/16; B22D11/00; C22C38/00; C22C38/60
Domestic Patent References:
| JP790466A | ||||
| JP3264616A | ||||
| JP62142053A | ||||
| JP6269915A | ||||
| JP57134541A | ||||
| JP7252588A |
Attorney, Agent or Firm:
Yuji Miura (1 outside)