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    • 1. 发明专利
    • DE69210503T3
    • 1999-12-23
    • DE69210503
    • 1992-08-19
    • KAWASAKI STEEL CO
    • HAYAKAWA YASUYUKINISHIIKE UJIHIROFUKUDA BUNJIROYAMADA MASATAKAIIDA YOSHIAKITAKEUCHI FUMIHIKOKOMATSUBARA MICHIRO
    • C21D8/12C22C38/00C22C38/60H01F1/16
    • A method of producing a grain oriented silicon steel sheet is adapted to lower the iron loss. A silicon steel slab, containing about 2.0 to 4.0 weight % of Si and an inhibitor-forming amount of S, or Se, or both, is hot rolled. After the hot rolled steel sheet is annealed when necessary, the steel sheet is cold rolled into a cold rolled steel sheet having a final thickness by performing cold rolling either one time or a plurality of times with intermediate annealing therebetween, the cold rolled steel sheet then being subjected to decarburization, coating of the surface of the steel sheet with an annealing separation agent mainly comprising MgO, secondary recrystallization annealing, and purification annealing. In the cold rolling step, an oxide layer exists on the surface of the steel sheet. Specifically, in the cold rolling step, rolling oil is supplied only at the entrance of the rolling mill used, and an oxide layer having a thickness of about 0.05 to 5 mu m is generated. Or, an outer oxide layer of an oxide layer structure generated on the surface of the steel sheet after hot rolling or intermediate annealing, is removed, and an inner oxide layer of a thickness of about 0.05 to 5 mu m is maintained on the surface, the resultant steel sheet then being subjected to cold rolling.
    • 2. 发明专利
    • DE69210503T2
    • 1996-09-12
    • DE69210503
    • 1992-08-19
    • KAWASAKI STEEL CO
    • HAYAKAWA YASUYUKINISHIIKE UJIHIROFUKUDA BUNJIROYAMADA MASATAKAIIDA YOSHIAKITAKEUCHI FUMIHIKOKOMATSUBARA MICHIRO
    • C21D8/12C22C38/00C22C38/60H01F1/16
    • A method of producing a grain oriented silicon steel sheet is adapted to lower the iron loss. A silicon steel slab, containing about 2.0 to 4.0 weight % of Si and an inhibitor-forming amount of S, or Se, or both, is hot rolled. After the hot rolled steel sheet is annealed when necessary, the steel sheet is cold rolled into a cold rolled steel sheet having a final thickness by performing cold rolling either one time or a plurality of times with intermediate annealing therebetween, the cold rolled steel sheet then being subjected to decarburization, coating of the surface of the steel sheet with an annealing separation agent mainly comprising MgO, secondary recrystallization annealing, and purification annealing. In the cold rolling step, an oxide layer exists on the surface of the steel sheet. Specifically, in the cold rolling step, rolling oil is supplied only at the entrance of the rolling mill used, and an oxide layer having a thickness of about 0.05 to 5 mu m is generated. Or, an outer oxide layer of an oxide layer structure generated on the surface of the steel sheet after hot rolling or intermediate annealing, is removed, and an inner oxide layer of a thickness of about 0.05 to 5 mu m is maintained on the surface, the resultant steel sheet then being subjected to cold rolling.
    • 3. 发明专利
    • DE69210503D1
    • 1996-06-13
    • DE69210503
    • 1992-08-19
    • KAWASAKI STEEL CO
    • HAYAKAWA YASUYUKINISHIIKE UJIHIROFUKUDA BUNJIROYAMADA MASATAKAIIDA YOSHIAKITAKEUCHI FUMIHIKOKOMATSUBARA MICHIRO
    • C21D8/12C22C38/00C22C38/60H01F1/16
    • A method of producing a grain oriented silicon steel sheet is adapted to lower the iron loss. A silicon steel slab, containing about 2.0 to 4.0 weight % of Si and an inhibitor-forming amount of S, or Se, or both, is hot rolled. After the hot rolled steel sheet is annealed when necessary, the steel sheet is cold rolled into a cold rolled steel sheet having a final thickness by performing cold rolling either one time or a plurality of times with intermediate annealing therebetween, the cold rolled steel sheet then being subjected to decarburization, coating of the surface of the steel sheet with an annealing separation agent mainly comprising MgO, secondary recrystallization annealing, and purification annealing. In the cold rolling step, an oxide layer exists on the surface of the steel sheet. Specifically, in the cold rolling step, rolling oil is supplied only at the entrance of the rolling mill used, and an oxide layer having a thickness of about 0.05 to 5 mu m is generated. Or, an outer oxide layer of an oxide layer structure generated on the surface of the steel sheet after hot rolling or intermediate annealing, is removed, and an inner oxide layer of a thickness of about 0.05 to 5 mu m is maintained on the surface, the resultant steel sheet then being subjected to cold rolling.
    • 10. 发明专利
    • METHOD FOR CONTROLLING COMBUSTION OF CONTINUOUS HEATING FURNACE
    • JPS61281820A
    • 1986-12-12
    • JP12310185
    • 1985-06-06
    • KAWASAKI STEEL CO
    • YAMADA MASATAKA
    • C21D1/52C21D9/00
    • PURPOSE:To execute stable control even if the billets having the heating load larger than the heating load of the billets in the charging side zone exist in said zone by processing specifically the calculated set furnace temp. value in the stage of executing the titled control in accordance with the optimum heating up curve of the billets to be heated from charging until extraction. CONSTITUTION:The present temp. of the billets existing in the corresponding zone and the optimum temp. of the present time determined by the optimum heating up curve for each billet are compared in a titled method for setting the furnace temp. in each zone of a heating furnace in accordance with the above-mentioned optimum heating up curve. The set furnace temp. value is then calculated in the set period. The future billet temp. in the set period from the present time is repeatedly estimated by the simulation using such set furnace temp. value and by taking the heating load of the billets existing in the zone nearer the charging side than the corresponding zone into consideration. Whether contradiction may arise in future in the above-mentioned set furnace temp. value of the corresponding zone or not is discriminated from the estimated temp. and the set furnace temp. value is corrected if there is the contradiction.