Title:
HEATING OPERATION OF STEEL MATERIAL FOR CONTINUOUS HOT-ROLLING
Document Type and Number:
Japanese Patent JP3845194
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a heating operating method of steel material for continuous hot-rolling, with which an extremely low temp. heating-continuous hot-rolling process can be realized to obtain the lowering the unit requirement of the heat in a heating furnace and the improvement of productivity caused by shortening of staying time in the furnace on condition of the stable secureness of quality, at the time of heating a continuous hot-rolling steel material in the continuous walking beam type heating furnace provided with a heating zone and a soaking zone.
SOLUTION: After rapidly heating the steel material in the heating zone at 1,200-1,350°C furnace temp., the steel material is ejected at 900-1,100°C ejecting temp. by holding the condition, so that the max. value of the average temp. of the steel material becomes ≤1,100°C, for ≥30 min before ejecting, in the soaking zone at ≤1100°C furnace temp., which is characterized in the operation. In this operation the compensation of lowering of the ejecting temp. caused by a fixed skid beam and the scale generation for securing the scale-off quantity are considered.
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Inventors:
Hideki Murakami
Toshiaki Saito
Toshiaki Saito
Application Number:
JP5550998A
Publication Date:
November 15, 2006
Filing Date:
March 06, 1998
Export Citation:
Assignee:
Nippon Steel Corporation
International Classes:
C21D1/00; C21D9/00; C21D1/52; C21D1/76; C21D6/00; (IPC1-7): C21D9/00; C21D1/00; C21D1/00; C21D1/52; C21D1/76; C21D6/00
Domestic Patent References:
| JP7246402A | ||||
| JP93527A | ||||
| JP6184627A |
Attorney, Agent or Firm:
Tomoyuki Yabuki
Tsugeko Shigeo
Tsugeko Shigeo