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1. 发明专利

JPS52153890A PREVENTING METHOD FOR DISASTERS OF OXYGEN PRODUCTION PLANT 失效
公开(公告)号：JPS52153890A
公开(公告)日：1977-12-21
申请号：JP7146976
申请日：1976-06-16
申请人： KOBE STEEL LTD
发明人： IWAKIRI HARUHISA , KONISHI MASAMI , KOBAYASHI JIYUNKICHI , KIMURA TSUKASA
IPC分类号： C01B13/02 , C01B13/00
摘要： PURPOSE:To prevent an explosion danger of an O2 production plant, by adjusting the concentration of C2H2 gas at the vicinity of an air intake of an O2 production plant by regulating the quantity of C2H2 gas generated from a C2H2 gas generation source.

2. 发明专利

JPS556476A ATMOSPHERE SHIELDING METHOD IN LADLE REFINING 失效
公开(公告)号：JPS556476A
公开(公告)日：1980-01-17
申请号：JP7911978
申请日：1978-06-28
申请人： KOBE STEEL LTD
发明人： KITAMURA MINORU , KAWASAKI SHIYOUZOU , KOBAYASHI JIYUNKICHI , KAWAI KENJI
IPC分类号： C21C7/072
摘要： PURPOSE:To prevent the surface of molten metal from contacting the atmosphere by spouting non-oxidative gas to the surface of the molten steel from the circumference of the non-immersion part of the lance at the time of blowing the non-oxidative gas with the immersion lance into the molten metal in ladle. CONSTITUTION:The lance 1 covered with refractories is immersed through the opening part 71 of the cover 7 of the ladle 4 containing molten steel 5. Non-oxdative gas is blown through the upper inlet hole 2 of the lance 1 to stirr the molten steel 5. Or refining agents such as deoxidizer, desulphrizer, etc. are blown together with the non-oxidative gas. At this time, the non-oxidative gas is simultaneously introduced through the inlet hole 32 of the lance 1 and is spouted onto the molten steel surface from the hood 34 provided around the lance 1. The exposed surface 51 of the molten steel is covered with the non-oxidative gas by the bubbles 8 of the non-oxidative gas. In this way, the molten steel 5 is cut off from contacting with the atmosphere, and the degradation of its quality by absorbing oxygen, nitrogen and hydrogen from the inside of air is obviated.

3. 发明专利

JPS54119363A ROLLED STEEL SHEET OF UNEQUAL THICKNESS 失效
公开(公告)号：JPS54119363A
公开(公告)日：1979-09-17
申请号：JP2680578
申请日：1978-03-08
申请人： KOBE STEEL LTD
发明人： KOKUBO ICHIROU , BAN SEIJI , TAKIZAWA KENSABUROU , KOYAMA YUUJI , KOBAYASHI JIYUNKICHI , UEDA NAGAMASA
IPC分类号： B21B1/26 , B21B1/28 , B21B27/02
摘要： PURPOSE:To manufacture the drum type steel sheet of unequal thickness, whose thick middle part has a great tensile rigidity, by employing the reduction rolls formed into an hourglass type. CONSTITUTION:The reduction roll of the roughing mill R2 is a cylindrical type of approximately uniform diameter in the axial direction; the reduction rolls of following roughing mill R4 and finishing mills F1 ... F7 are formed into an hourglass type whose both ends are of large diameter which is gradually reduced down toward the middle part, so as to settle the diameter difference between each end and the middle part to approximately above 0.6 mm; thickness of the steel sheet rolled through the mills R4, F1 ... F5 is made approximately 2.8-3.5 mm, and the thickness ratio between the middle part and the end part at least on the exit side of the mill F2 is settled above 1.1. The reduction rolls of following mills C1 ... C5, P1, are formed into an hourglass type whose diameter is reduced gradually from both ends toward the middle part; thickness ratio between the middle part and the end part on the exit side of the mill C2 is held approximately constant, and then, the steel sheet is formed into thin and similar shape.

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