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    • 8. 发明专利
    • METHOD FOR COMBUSTION CONTROL OF HEATING FURNACE FOR ROLLED STOCK OF SEAMLESS PIPE
    • JPS6447819A
    • 1989-02-22
    • JP20163487
    • 1987-08-12
    • NIPPON STEEL CORPNITTETSU DENSETSU KOGYO
    • KUBO RIKICHIYOSHIHARA TADASHINARASAKI KOJIMAEDA NORIAKISAKAMOTO KATSUYOSHIZENIKAME MITSURU
    • C21D9/00
    • PURPOSE:To produce a high-quality seamless pipe at a low fuel consumption per unit quantity of product by determining the predicted temp. of ejection from a heating furnace and temp. distribution from the rolling stock temp. on the inlet side of a rolling mill and the temp. distribution conditions of the rolled stock in a piercer in the thickness direction thereof. CONSTITUTION:A bloom extracted from the heating furnace is cut to a prescribed length and is bored with a hole in the axial center direction by the piercer. This stock is elongated cylindrically by 1st and 2nd elongators and is made into the seamless pipe by the continuous rolling mill. The rolled stock temp. on the inlet side of the rolling mill from the threshold rolling reaction in the continuous rolling mill and the temp. distribution conditions of the rolled stock in the piercer in the thickness direction thereof are determined by the model obtd. with the size and steel kinds into consideration. The predicted temp. of ejection from the heating furnace and temp. distribution satisfying these temp. conditions are then previously determined by the prescribed equation and the respective set values of the heating furnace are determined with a combustion control model and are applied to the heating furnace so that the rolled stock can be extracted at such temp. The fuel consumption per unit of the heating furnace is thereby decreased and the high-quality seamless pipe having no thickness deviation is obtd.