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1. 发明专利

DE2803940A1 未知
公开(公告)号：DE2803940A1
公开(公告)日：1978-08-03
申请号：DE2803940
申请日：1978-01-30
申请人： KAWASAKI STEEL CO
发明人： KAITO HIROYUKI , OHTANI TAKASHI , IWAOKA SHOJI , OGUCHI YUKIO , YANO SHUYA , EJIMA AKIO
IPC分类号： C21C7/00 , C21C7/04 , C21C7/068 , C21C7/10 , C22C38/18
摘要： High chromium steels having extremely low carbon and nitrogen contents are produced by blowing more than 15 up to 40 Nl/min per ton of molten steel of an inert gas into a high chromium steel containing 0.8 to 2.5% of C and 10 to 35% of Cr in a ladle under a reduced pressure from bottom of a ladle and concurrently blowing oxygen gas to the molten steel surface to form 1 to 100 kg per ton of the molten steel of a slag containing not less than 20% of SiO2 and not more than 25% of Cr2O3 at the end of oxygen blowing, terminating the oxygen blowing when the carbon concentration in the molten steel becomes not more than 0.020%, and subsequently blowing 6 to 40 Nl/min per ton of molten steel of an inert gas under a high vacuum of not more than 10 torr.

2. 发明专利

DE2803939A1 未知
公开(公告)号：DE2803939A1
公开(公告)日：1978-08-03
申请号：DE2803939
申请日：1978-01-30
申请人： KAWASAKI STEEL CO
发明人： KAITO HIROYUKI , OHTANI TAKASHI , IWAOKA SHOJI , OGUCHI YUKIO , YANO SHUYA , EJIMA AKIO
IPC分类号： C21C7/00 , C21C7/04 , C21C7/068 , C21C7/10

3. 发明专利

DE3274724D1 METHOD OF FORMING ELECTRIC WELDED STEEL TUBE 未知
公开(公告)号：DE3274724D1
公开(公告)日：1987-01-29
申请号：DE3274724
申请日：1982-03-05
申请人： KAWASAKI STEEL CO
发明人： TOYOOKA TAKAAKI , YOKOYAMA EIICHI , ONODA YOSHITOMI , EJIMA AKIO
IPC分类号： B21C37/08 , B21D5/12
摘要： In a method of forming an electric welded steel tube, wherein a hot-rolled sheet is formed into a cylindrical shape, with the central portion thereof being lowered as the forming progresses, and thereafter, subjected to reduction in the circumferential direction of the tube by means of tandem type fin-pass rolls to be finished into the tube, the proper forming condition ranges capable of eliminating occurrence of edge waves in the tube seam edge portion and/or of cambers in the longitudinal direction of the tube by three forming conditions factors including the downhill value DH (downhill coefficient eta ) of the hot-rolled sheet, the fin-pass total reduction R of the tandem type fin-pass rolls and the distribution of the fin-pass reduction (the distribution ratio delta of the first fin-pass reduction).

4. 发明专利

CA1176086A METHOD OF FORMING ELECTRIC WELDED STEEL TUBE 未知
公开(公告)号：CA1176086A
公开(公告)日：1984-10-16
申请号：CA397991
申请日：1982-03-10
申请人： KAWASAKI STEEL CO
发明人： TOYOOKA TAKAAKI , YOKOYAMA EIICHI , EJIMA AKIO , ONODA YOSHITOMI
IPC分类号： B21C37/08 , B23K5/02
摘要： OF THE DESCLOSURE: In a method of forming an electric welded steel tube, wherein a hot-rolled sheet is formed into a cylindrical shape, with the central portion thereof being lowered as the forming progresses, and thereafter, subjected to reduction in the circumferential direction of the tube by means of tandem type fin-pass rolls to be finished into the tube, the proper forming condition ranges capable of eliminating occurrence of edge waves in the tube seam edge portion and / or of cambers in the longitudinal direction of the tube by three forming conditions factors including the downhill value DH (downhill coefficient ?) of the hot-rolled sheet, the fin-pass total reduction R of the tandem type fin-pass rolls and the distribution of the fin-pass reduction (the distribution ratio .delta. of the first fin-pass reduction).

5. 发明专利

DE2803941A1 未知
公开(公告)号：DE2803941A1
公开(公告)日：1978-08-03
申请号：DE2803941
申请日：1978-01-30
申请人： KAWASAKI STEEL CO
发明人： OGUCHI YUKIO , YANO SHUYA , EJIMA AKIO , KAITO HIROYUKI , OHTANI TAKASHI , IWAOKA SHOJI
IPC分类号： C21C7/00 , C21C7/04 , C21C7/10 , C22C38/18

6. 发明专利

CA1131105A METHOD OF PRODUCING HIGH-STRENGTH STEEL PIPES HAVING A GOOD WELDABILITY AND ADAPTED TO BE USED IN A STEAM DISTRIBUTION PIPELINE IN THE OIL SANDS DEVELOPMENT 未知
公开(公告)号：CA1131105A
公开(公告)日：1982-09-07
申请号：CA358149
申请日：1980-08-13
申请人： KAWASAKI STEEL CO
发明人： ISHIMOTO KIYOSHI , YOKOYAMA EIICHI , EJIMA AKIO
IPC分类号： C22C38/00 , B23K9/235 , C21D6/00 , C21D9/08 , C21D8/10
摘要： A high-strength steel pipe having a good weldability and adapted to be used in steam distribution pipelines in the oil sands (tar sands) development is disclosed. This steel pipe is obtained by heating a steel pipe having a specifically limited composition consisting of C, Si, Mn, Mo, V, A? and the remainder being Fe and incidental impurities at a temperature of not lower than the Ac3 point, quenching the above heated steel pipe and tempering the quenched steel pipe at a temperature within the range of from 600.degree.C to the Ac1 point.

7. 发明专利

JPS6325844B2 失效
公开(公告)号：JPS6325844B2
公开(公告)日：1988-05-27
申请号：JP113982
申请日：1982-01-07
申请人： KAWASAKI STEEL CO
发明人： IMAE TOSHIO , TOGASHI FUSAO , KANARI SHOHEI , SAYAMA YASUHIRO , EJIMA AKIO
IPC分类号： B21B17/02 , B21B17/04

8. 发明专利

JPS62279050A CASTING METHOD AND CASTING MOLD FOR UNIDIRECTIONALLY SOLIDIFIED INGOT 失效
公开(公告)号：JPS62279050A
公开(公告)日：1987-12-03
申请号：JP11904486
申请日：1986-05-26
申请人： KAWASAKI STEEL CO
发明人： KINOSHITA KATSUO , MIYAGAWA SHOJI , SHINJO YUTAKA , OGUCHI MASAO , EJIMA AKIO
IPC分类号： B22D7/00 , B22D27/04
摘要： PURPOSE:To obtain a unidirectional solidified ingot having free size by shifting a short side mold as keeping constantly molten surface level after reaching the prescribed level for the molten surface in the mold. CONSTITUTION:The molten steel is poured from a ladle 7 through an immersion nozzle 4 of a pony ladle 6, and after the molten steel is reached to the prescribed level, the short side mold 3 ' is shifted together with a bottom plate and side wall by driving a caterpillar. After the movable short side mold 3 ' is reached at the prescribed position, the caterpillar is stopped and the molten steel is stably laid to progress the unidirectional solidification. In the bottom plate block on the caterpillar, at the same time with starting the casting or at the same time with putting stably the molten steel and starting the solidification, coolant is supplied from outside of this apparatus and by strengthening the cooling from the ingot bottom, the unidirectional solidification is promoted and also the leusly solidified structure is obtd. When the height of ingot is reached to the prescribed height, an ingot top removing device is shifted to remove dense segregation part together with molten surface coating agent and exothermic heat insulating agent. Next, by driving the caterpillar, the ingot is drawn out to forward and also the short side mold 3' is removed at the end of caterpillar.

9. 发明专利

JPS62254955A CONTROL METHOD FOR MOLTEN STEEL FLOW IN MOLD OF CONTINUOUS CASTING 失效
公开(公告)号：JPS62254955A
公开(公告)日：1987-11-06
申请号：JP9852286
申请日：1986-04-28
申请人： KAWASAKI STEEL CO
发明人： KINOSHITA KATSUO , HOSOYA KOJI , MURATA KENJI , OGUCHI MASAO , EJIMA AKIO
IPC分类号： B22D11/10 , B22D11/103 , B22D11/114 , B22D11/115
摘要： PURPOSE:To reduce development of product defect, such as UT defect, blister, bulging, etc., even in case of high speed casting, by forming the width of an iron core section of a magnetic pole giving static magnetic field, so as to satisfy the specific equation. CONSTITUTION:The width (w) of the iron core section for the magnetic pole 2 giving the static magnetic field is formed, so as to satisfy the equation w=alpha.W under condition of 0.18

10. 发明专利

JPS6059048B2 失效
公开(公告)号：JPS6059048B2
公开(公告)日：1985-12-23
申请号：JP10939379
申请日：1979-08-28
申请人： KAWASAKI STEEL CO
发明人： SAYAMA YASUHIRO , ABE HIDEO , SAKURADA KAZUYUKI , TOYOOKA TAKAAKI , FUNYU YUTAKA , EJIMA AKIO
IPC分类号： B21B37/00 , B21B37/18 , B21B37/78

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