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21. 发明专利

JPS602616A METHOD FOR PROTECTING REFRACTORY IN CONVERTER FOR MANUFACTURING HIGH CHROMIUM STEEL BY REFINING 失效
公开(公告)号：JPS602616A
公开(公告)日：1985-01-08
申请号：JP10849983
申请日：1983-06-16
申请人： NISSHIN STEEL CO LTD
发明人： HOSHI NORIO , SHIGEMATSU NAOKI
IPC分类号： C21C5/36 , C21C5/28 , C21C5/44
摘要： PURPOSE:To prevent the wear of refractories in a converter when molten iron contg. Cr is refined in the converter by oxygen blowing by adding chrome ore to the converter to form prescribed slag contg. chromium oxide. CONSTITUTION:Chrome ore is added to a top and bottom blowing converter to form slag contg. 30-50wt% Cr2O3 before or during the refining of molten iron contg. Cr in the converter by blowing oxygen from the top while blowing an agitating gas from the bottom. By this method the corrosion loss of refractories in the converter is inhibited during blowing, and the surface of the refractoris is protected by coating after stopping the blowing.

22. 发明专利

JPS5892834A DETECTION FOR AIR CHARGING POSITION TO VACUUM VESSEL SYSTEM IN VACUUM REFINING OF MOLTEN STEEL 失效
公开(公告)号：JPS5892834A
公开(公告)日：1983-06-02
申请号：JP19152381
申请日：1981-11-28
申请人： NISSHIN STEEL CO LTD
发明人： HOSHI NORIO , SAIDA YUUZOU
IPC分类号： C21C7/10 , G01M3/20 , G01M3/22
摘要： PURPOSE:To detect quickly and accurately a position through which air is charged to a vacuum vessel system, by blowing an inert gas to all seal parts of the vacuum vessel system successively to measure the sensitivity to the inert gas. CONSTITUTION:The pressure in a vacuum vessel system consisting of a vessel 1 and an attachable and detachable vessel cover 2 is reduced by an air discharge system 5. Oxygen is blown from a lance 7 onto a molten steel in a ladle 6. The degradation of the degree of vacuum is due to the lowering of the air discharge capability of the air discharge system 5 or the defect of air-tightness in a seal part (A), (B), or (C). An inert gas is blown to seal parts successively from preliminarily installed pipings 9, and discharge gas samples are analyzed with a mass spectrograph, and a position of the defect of airtightness is discriminated on a basis of the variance of measured values before and after blowing. Thus, the cause position is detected quickly and accurately without stopping the operation.

23. 发明专利

JPS57122281A Composite for lining furnace 失效
标题翻译：内衬炉的复合材料
公开(公告)号：JPS57122281A
公开(公告)日：1982-07-30
申请号：JP810781
申请日：1981-01-23
申请人： Nisshin Steel Co Ltd , Asahi Glass Co Ltd
发明人： HOSHI NORIO , SHIGEMATSU NAOKI , HAYASHI YUUICHIROU
IPC分类号： F27D1/08 , F27D1/10

24. 发明专利

JPS56139614A REFINING METHOD FOR STAINLESS STEEL 失效
公开(公告)号：JPS56139614A
公开(公告)日：1981-10-31
申请号：JP4282780
申请日：1980-04-03
申请人： NISSHIN STEEL CO LTD
发明人： HOSHI NORIO , SAIDA YUUZOU
IPC分类号： C21C7/00 , C21C7/068 , C21C7/076
摘要： PURPOSE:To produce a high-quality stainless steel without using any special equipment and costly slag making agent by transferring the slag produced in a converter process together with molten steel into a degassing refining process for molten steel and subjecting the molten steel to deoxidation treatment by the diffusion deoxidation of this slag. CONSTITUTION:The slag which is produced in a refining process under atmospheric pressure in a converter and has been so controlled of its basicity (CaO/SiO2) as to assume >=1.0 is transferred together with molten steel into a degassing refining process under decreased pressure in a vacuum ladle degassing device. The deoxidation of the molten steel in this degassing process is accomplished by the slag diffusion of the above-described slag. It is preferable to control the slag basicity after the degassing as to assume 0.8-1.5 in this degassing process. To effectively execute the treatment of the slag diffusion and deoxidation in the degassing process, it is desirable to use a ladle provided with a porous plug in the bottom and stir the molten steel by blowing an inert gas through this plug.

25. 发明专利

JPS5589417A REFINING METHOD OF MOLTEN STEEL UNDER VACUUM 失效
公开(公告)号：JPS5589417A
公开(公告)日：1980-07-07
申请号：JP16011278
申请日：1978-12-27
申请人： NISSHIN STEEL CO LTD
发明人： HOSHI NORIO , SAIDA YUUZOU
IPC分类号： C21C7/10
摘要： PURPOSE:To prevent splash and spitting as well as to enhance workability by a mechanism wherein, in case of refining molten steel along with slag containing metal oxides under vacuum, an average pressure reducing speed within a predetermined time from a start of vacuum treatment and a vacuum degree are maintained to a specific value. CONSTITUTION:In a vessel 2, is introduced a ladle 1 which has received molten steel melted and primarily decarburized in a previous process and the said vessel 2 is hermetically seald by applying a cover 3. And an inert gas is blown into the said ladle 1 from a porous plug 4 provided at a bottom of a ladle 1 and gas within a system is exhausted through a duct 5 to reduce pressure within a vessel 2. Moreover, O2 is blown to the surface of slag layer from a lance pipe 6 inserted hermetically through a cover 3. In above described constitution, during at least 4 min from a start of vacuum treatment, an average pressure reducing speed is controlled below 165Torr/sec. and the pressure within a vessel 2 is maintained at below 100Torr. As a result, if pressure is rapidly reduced to a high vacuum degree just before O2 is blown in, abrupt boiling is not generated and the generation of spitting and splash is controlled to a large extent as well as the effluent of metal can be prevented.

26. 发明专利

JPS5438189A METHOD AND APPARATUS FOR MEASURING OF GAS EVOLUTION QUANTITY 失效
公开(公告)号：JPS5438189A
公开(公告)日：1979-03-22
申请号：JP10521477
申请日：1977-08-31
申请人： SHIMADZU CORP , NISSHIN STEEL CO LTD
发明人： FUJISAWA AKIRA , HOSHI NORIO , SAIDA YUUZOU
IPC分类号： G01N7/00
摘要： PURPOSE:To measure the evolution quantity of gas by measuring dummy gas supply quantity and the dummy gas pressure and evolved gas pressure in exhaust gas.

27. 发明专利

JPS52147512A REFINING OF STAINLESS STEEL 失效
公开(公告)号：JPS52147512A
公开(公告)日：1977-12-08
申请号：JP6358976
申请日：1976-06-02
申请人： NISSHIN STEEL CO LTD
发明人： NAKANO YOSHITOMO , NOGUCHI YOSHIO , HOSHI NORIO , SAIDA YUUZOU
IPC分类号： C21C7/00

28. 发明专利

JPH029902B2 失效
公开(公告)号：JPH029902B2
公开(公告)日：1990-03-05
申请号：JP12756083
申请日：1983-07-15
申请人： NISSHIN STEEL CO LTD
发明人： YAMAUCHI TAKASHI , MARUHASHI SHIGEAKI , HOSHI NORIO
IPC分类号： B22D11/06 , B22D11/10 , B22D11/112 , B22D11/113 , B22D11/115 , B22D11/116 , B22D11/118

29. 发明专利

JPH01249214A PREVENTING METHOD FOR SCALE DEFECT OF HOT ROLLING STEEL PLATE 失效
公开(公告)号：JPH01249214A
公开(公告)日：1989-10-04
申请号：JP7628788
申请日：1988-03-31
申请人： NISSHIN STEEL CO LTD
发明人： YAMAMOTO HIROSHI , TAKAHASHI HIROSHI , HOSHI NORIO
IPC分类号： B21B45/00 , B21B1/02 , C21D9/00
摘要： PURPOSE:To improve the exfoliation property of a primary scale in a heating furnace and to obtain a rolled stock having few scale defects by applying a phosphate treating agent on the surface of a slab and subjecting heat rolling. CONSTITUTION:The phosphate treating agent is applied on the surface of the slab 6 directly or after removing the oxide film by grinding, etc., to make the concn. to be 0.1-5.0g/m P corresponding to the kind of steel. The slab 6 applied with the phosphate treating agent is charged into heating furnaces 1 and 2 to heat. The heating is performed for 2-4h and the temp. of the heating extraction temp. is performed in the range of 1,100-1,300 deg.C. The extracted slab is rough rolled in the surface temp. range of 1,100-1,150 deg.C at the outlets of the rough rolling mills 3 and 4. By this method, the exfoliation property of the primary scale in the heating furnaces is improved and the scale defects are reduced.

30. 发明专利

JPS6013406B2 失效
公开(公告)号：JPS6013406B2
公开(公告)日：1985-04-06
申请号：JP16011278
申请日：1978-12-27
申请人： NISSHIN STEEL CO LTD
发明人： HOSHI NORIO , SAIDA JUZO
IPC分类号： C21C7/10

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