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11. 发明专利

JPH07258720A METHOD FOR REFINING AUSTENITIC STAINLESS STEEL HAVING EXCELLENT HOT WORKABILITY 失效
公开(公告)号：JPH07258720A
公开(公告)日：1995-10-09
申请号：JP5383794
申请日：1994-03-24
申请人： NIPPON STEEL CORP
发明人： FUKUMOTO SHIGEO , TANAKA SHIGENORI , YANAI TAKASHI , IWASAKI HIROSHI , OKIMORI MAYUMI
IPC分类号： C21C7/06 , C21C7/00 , C21C7/064 , C21C7/068 , C21C7/072
摘要： PURPOSE:To drastically reduce the development of surface crack flaw at the time of hot-rolling by achieving extra low sulfur and extra low oxygen in the refining of an austenitic stainless steel. CONSTITUTION:The decarburize-treatment is executed by oxidizerefining in a main-refining furnace to execute the reducing treatment for recovering the chromium oxidize by the decarburize-treatment with an alloy mainly containing silicon, and successively, the treated molten steel is tapped into a ladle from the main refining furnace and the powder injecting treatment is executed in the ladle to execute the refining of the stainless steel. In this powder injecting method, the powder containing 40-80wt.% CaO and 20-60wt.% CaF2 is blown at 3kg/ton of molten steel together with inert gas to make the molten steel

12. 发明专利

JPH06192721A METHOD FOR BLENDING RAW MATERIAL IN CHROMIUM-CONTAINING MOLTEN STEEL AND MELTING METHOD 失效
公开(公告)号：JPH06192721A
公开(公告)日：1994-07-12
申请号：JP34486792
申请日：1992-12-24
申请人： NIPPON STEEL CORP
发明人： NAKAO RYUJI , TANAKA SHIGENORI , YANAI TAKASHI , YOSHIMURA YUJI
IPC分类号： C21C7/00 , C21C7/068
摘要： PURPOSE:To efficiently make Pb, Zn and Sn concns. after decarburize-refining the prescribed values or lower by regulating [C] concn. in the blended raw material charged in an electric furnace and also, deciding the kinds, blending ratios and melting holding time of the raw material based on the specific equations. CONSTITUTION:At the time of melting a chromium-containing molten steel with the electric furnace and a decarburize-refining furnace, [C] concn. in the blended raw material charged into the electric furnace is made to be >=1.2 mass %. Further, based on the removal ratios of Pb, Zn and Sn given in the equations (wherein, t: melting holding time from melt-down of the raw material at the time of melting in the electric furnace (min), [C]o: [C] concn. at the time of blending the raw material (mass %), [Pb], [Zn] and [Sn]: each concn. in the blended raw material or in the molten steel (ppm), affix o: at the time of blending the raw material, affix f: at the time of completing the decarburization), the kinds and the blending ratios of the raw materials are decided so as to make the Pb, Zn and Sn concns. after decarburize-refining the prescribed values or lower in the prescribed melting holding time. By this method, the raw material in the low cost can be blended at the time of blending the raw material and the off-spec product of Pb, Zn and Sn is eliminated.

13. 发明专利

JPH06190507A STAINLESS STEEL CAST SLAB HAVING EXCELLENT SURFACE CHARACTERISTIC AND CONTINUOUS CASTING METHOD THEREOF 失效
公开(公告)号：JPH06190507A
公开(公告)日：1994-07-12
申请号：JP34437192
申请日：1992-12-24
申请人： NIPPON STEEL CORP
发明人： HOUJIYOU MASATAKE , TANAKA SHIGENORI , YANAI TAKASHI , NAKANO TAKESHI
IPC分类号： B22D11/00 , B22D11/07 , B22D11/16
摘要： PURPOSE:To enable non-cleaning rolling for a stainless steel cast slab by selecting mold cooling, mold material, powder characteristic, etc., in order to uniformize the solidifying speed of the top part and the bottom part of an oscillation mark on the cast slab. CONSTITUTION:In the cast slab cast by continuous casting, the ratio (S B)/(S T) of a secondary dendritic arm interval (S B) at the bottom part of the oscillation to a secondary dendritic arm interval (S T) at the top part of the oscillation below the surface shell of this cast slab at 150-250mum is made to be =1.4, the breakage of solidified shell is caused, and the larger the ratio of these secondary arm intervals is, the deeper a segregation zone is. As to the solidifying speed at the top part and the bottom part, that at the bottom part is ordinarily lower than at the top part, but by making this ratio almost >=0.5, the segregation zone can be prevented. By this method, the non-cleaning rolling can be attained, and by saving the cleaning to the cast slab, the cost can be reduced.

14. 发明专利

JPH05123843A METHOD AND APPARATUS FOR CONTINUOUS CASTING 失效
公开(公告)号：JPH05123843A
公开(公告)日：1993-05-21
申请号：JP31022491
申请日：1991-10-30
申请人： NIPPON STEEL CORP
发明人： YAMAMOTO TETSUYA , YANAI TAKASHI , NAKANO TAKESHI , KAWAMOTO KATSUHIKO
IPC分类号： B22D11/04 , B22D11/041 , B22D11/20 , B22D11/22
摘要： PURPOSE:To provide a setting method and a controlling device for casting velocity so that the casting velocity becomes the max. in a continuous casting. CONSTITUTION:In the continuous casting apparatus arranging an arithmetic control device 8 for controlling number of revolutions of pinch rolls and a secondary cooling water quantity, a flow meter 4 and a flow rate control valve 9 are fitted to the secondary cooling system for cooling a cast slab 13 and a pulse counter 6 for detecting the number of revolutions and a driving motor 10 are fitted to pinch rolls 7 drawing out the cast slab and signals from the flow meter and the pulse counter are inputted, and distance from solidified starting point 14 to solidified completing point 15 in the cast slab is calculated. By this method, the max. casting velocity without flowing out the unsolidified molten metal from the cutting part of the cast slab can easily be set, and labor saving in the operation in the continuous casting and improvement of the productivity can be obtd.

15. 发明专利

JPH04111947A METHOD FOR CONTINUOUSLY CASTING TI-CONTAINING SUPER ALLOY 失效
公开(公告)号：JPH04111947A
公开(公告)日：1992-04-13
申请号：JP22899990
申请日：1990-08-30
申请人： NIPPON STEEL CORP
发明人： YAMAMOTO TETSUYA , YANAGI YOSHIHIRO , YANAI TAKASHI
IPC分类号： B22D11/00 , B22D11/20 , C22C30/00
摘要： PURPOSE:To improve the productivity of continuous casting by incorporating N having the specific relation with Ti in a super alloy containing the specific wt.% of Ti, Ni and Cr. CONSTITUTION:The super alloy having compn. containing wt.% of >=0.1% Ti, $40% Ni and >=20% Cr is continuously cast. Then, the super alloy having compn. containing wt.% of N satisfying the inequality I is cast. Further, continuous casting velocity V is made to satisfy the inequality II. In the inequality II, V: casting velocity (m/min), Ni-eq=Ni(wt.%)+30C(wt.%)+0.5Mo(wt.%)+0.5Cu(wt.%), Cr-eq=Cr(wt.%)+Mo(wt.%)+1.5Si(wt.%). By this method, the Ti- containing super alloy can be stably and continuously cast.

16. 发明专利

JPH0238058B2 失效
公开(公告)号：JPH0238058B2
公开(公告)日：1990-08-28
申请号：JP19396186
申请日：1986-08-21
申请人： NIPPON STEEL CORP
发明人： YANAI TAKASHI , TSUCHIDA HIDENORI , ARYOSHI HARUKI
IPC分类号： B22D11/10 , B22D41/50

17. 发明专利

JPS52146725A MEASURING METHOD OF MOLTEN STEEL IN TUNDISH OF CONTINUOUS CASTING 失效
公开(公告)号：JPS52146725A
公开(公告)日：1977-12-06
申请号：JP6388076
申请日：1976-06-01
申请人： NIPPON STEEL CORP
发明人： KOMANO TADAAKI , YANAI TAKASHI
IPC分类号： B22D11/16 , B22D39/00

18. 发明专利

JPS5215353A DETECTOR TO MEASURE FINE MOVEMENT QUANTITY 失效
公开(公告)号：JPS5215353A
公开(公告)日：1977-02-04
申请号：JP9144975
申请日：1975-07-25
申请人： NIPPON STEEL CORP , KUROSAKI REFRACTORIES CO , MISHIMA KOSAN CO LTD
发明人： MATSUO TERUMOTO , HONDA KAZUMICHI , URIYUU MASAO , KOIZUMI FUSAICHI , IKEHARA YASUMASA , YANAI TAKASHI
IPC分类号： G01B7/02 , G01B7/16
摘要： PURPOSE:Movement quantity of below a few mm of mechanical equipment is detected by contacting a detector arranged between two load cells confronting each other, with each load cell.

19. 发明专利

JPH06254661A METHOD FOR CONTINUOUSLY CASTING SURFACE CLEAN STEEL 失效
公开(公告)号：JPH06254661A
公开(公告)日：1994-09-13
申请号：JP6916793
申请日：1993-03-05
申请人： NIPPON STEEL CORP
发明人： NAKANO TAKESHI , YANAI TAKASHI , MATSUMURA SHOGO , HOUJIYOU MASATAKE
IPC分类号： B22D11/10 , B22D11/103 , B22D11/112 , B22D11/114 , B22D11/116 , B22D11/16
摘要： PURPOSE:To prevent the generation of surface fault at the time of rolling by reducing the oscillation mark depth in a continuously cast slab. CONSTITUTION:This continuous casting method for surface clean steel is featured by using an immersion nozzle which is formed in an integrated shape so as not to enter the air and has plural molten steel discharging holes set horizontally or downward and in which a ratio S/(s) is

20. 发明专利

JPH06192719A METHOD FOR REMOVING IMPURITY IN CHROMIUM-CONTAINING MOLTEN STEEL 失效
公开(公告)号：JPH06192719A
公开(公告)日：1994-07-12
申请号：JP34486592
申请日：1992-12-24
申请人： NIPPON STEEL CORP
发明人： NAKAO RYUJI , TANAKA SHIGENORI , YANAI TAKASHI , YOSHIMURA YUJI
IPC分类号： C21C7/00 , C21C7/068
摘要： PURPOSE:To efficiently remove impurities of Pb, Zn, Bi, Sn, etc., in molten steel and to reduce the load in the pre- and the post-processes by controlling the supplying of oxygen according to C concn. in the chromium-containing molten steel to execute decarburize-refining. CONSTITUTION:At the time of decarburize-refining the chromium-containing molten steel, the decarburization is started at >=1.2mass% C in the molten steel, and while supplying the oxygen in a range satifying the inequality OT/(OT +OB)>=0.2 (wherein, OT: top-blowing oxygen supplying velocity Nm /hr, OB: bottom-blowing oxygen supplying velocity Nm /hr) in the range of >=0.5mass% C, the decarburize-refining is executed. By this method, the removal of the impurities of Pb, Zn, Bi, Sn, etc., in the molten steel is promoted and the regulation of the impurity concn. and the using quantity of the melting raw material is released and the concn. aimed values of Pb, Zn, Bi, Sn, etc., at the final- refining stage are achieved.

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