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31. 发明专利

JPS55158208A REFINING METHOD OF STEEL 失效
公开(公告)号：JPS55158208A
公开(公告)日：1980-12-09
申请号：JP6422179
申请日：1979-05-24
申请人： SUMITOMO METAL IND
发明人： MARUKAWA YUUJIYOU , YAMAZAKI ISAO , ANEZAKI MASAHARU , KAJIMOTO TSUTOMU
IPC分类号： C21C5/32 , C21C5/35
摘要： PURPOSE:To improve the stirring and contact of molten metal and molten slag, prevent the excessive oxidation of Fe and accelerate dephosphorization reaction by blowing the gas composed primarily of CO2 and CO from the nozzle under the molten metal surface during blowing of steel in an oxygen top blowing converter or upon ending of the blowing. CONSTITUTION:At the time of refining steel in the oxygen top blowing converter, the gas composed primarily of CO2 and CO is blown through the nozzle provided on the bottom or side wall of the converter for the fixed period at the final end of the oxygen blowing or upon ending of the oxygen blowing to stir the molten metal. The gas used here is the gas rich in CO2 and CO by treating the exhaust gas from metal refining furnaces and the combustion exhaust gas from various heating furnaces. The CO gas of twice the CO2 is evolved by the reaction of the C and CO2 of molten metal to improve the contact between the molten metal and molten slas and accelerate the dephosphorization reaction of molten metal as well as to suppress the oxidation of Fe, Mn, etc. and improve the yield of molten steel as well.

32. 发明专利

JPS5528376A PRODUCTION OF LOW HYDROGEN CONTENT STEEL 失效
公开(公告)号：JPS5528376A
公开(公告)日：1980-02-28
申请号：JP10206678
申请日：1978-08-21
申请人： SUMITOMO METAL IND
发明人： YAMAZAKI ISAO , NOSHITA KOUHEI , OKAMOTO SETSUO
IPC分类号： C21C7/00 , C21C5/28 , C21C7/04
摘要： PURPOSE:To produce low hydrogen content steel, by blowing gas dried by quick lime into the connecting pipe between the bunker on the alloy iron storage furnace for adding molten steel and the alloy iron feeder to remove moisture from the alloy iron, and adding alloy iron not containing moisture to the molten steel. CONSTITUTION:Alloy iron such as Fe-Si is added to the molten steel discharged into a ladle 17 after blowing, in order to adjust the composition, from a bunker 4a on the furnace through and electromagnetic feeder for dispensing 3. At this time, dry gas (e.g. air) at ordinary temperature dried by quick lime in a bunker 4b on the furnace is sucked 14 into a communicating pipe 5 between said bunker 4a and feeder 3 through bag filter 6 and blower 7 and is continuously supplied. As a result, the alloy iron in the pipe 5 is continuously dried, and the moisture existing in the alloy iron is removed before adding to the molten steel. Therefore, entry of hydrogen into the molten steel may be prevented, sp that low hydrogen content steel may be obtained.

33. 发明专利

JPS5395823A MANUFACTURE OF COLD ROLLED STEEL SHEET WITH EXCELLENT PRESS MOLDABILITY 失效
公开(公告)号：JPS5395823A
公开(公告)日：1978-08-22
申请号：JP1055177
申请日：1977-02-02
申请人： SUMITOMO METAL IND
发明人： YAMAZAKI ISAO , SHIROTA YOSHIYASU , OGUCHI TOMOO , NAKAI SHIYUUJI
IPC分类号： C22C38/00 , C21D6/00 , C21D8/02 , C21D9/48 , C22C38/06
摘要： PURPOSE:To prevent hot shortness of a low Mn steel sheet at the time of hot rolling and improve press moldability by hot rolling a steel slab of 1,100 - 1,200 deg.C at a low temp. so that the finish temp. becomes 820 - 880 deg.C followed by cold rolling.

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