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61. 发明专利

JPH05214489A STEEL SHEET FOR SPRING EXCELLENT IN SPRING LIMIT VALUE AND SHAPE FREEZABILITY AND ITS PRODUCTION 失效
公开(公告)号：JPH05214489A
公开(公告)日：1993-08-24
申请号：JP1912892
申请日：1992-02-04
申请人： NIPPON STEEL CORP
发明人： NISHIMURA SATORU , SHIODA KOSAKU , UEJIMA YOSHIYUKI , NAKATSUKA ATSUSHI , MIZOGUCHI TOSHIAKI
IPC分类号： B21B3/00 , C21D9/46 , C22C9/00 , C22C30/02 , C22C38/00 , C22C38/30 , C22F1/00 , C22F1/08 , C23C28/02 , C23C30/00
摘要： PURPOSE:To obtain a steel sheet for spring well balanced between spring limit value and shape freezability and excellent in electric conductivity and reliability. CONSTITUTION:A molten metal having a composition consisting of 20-85% Cu, 0.0005-1.0% Co, 0.005-3.5% Ti, 0.1-10% Cr, 0.001-1.5% Mo, and the balance Fe is subjected to casting at >=100 deg.C/sec solidification and cooling rate, to primary cold rolling at >=50% draft, to annealing, and to secondary cold rolling at 5-85% draft, followed by ageing treatment.

62. 发明专利

JPH05212502A METHOD AND DEVICE FOR TWIN ROLL TYPE STRIP CONTINUOUS CASTING 失效
公开(公告)号：JPH05212502A
公开(公告)日：1993-08-24
申请号：JP1909192
申请日：1992-02-04
申请人： NIPPON STEEL CORP
发明人： MIYAZAWA KENICHI , MIZOGUCHI TOSHIAKI , UEJIMA YOSHIYUKI , HORI RYUICHI
IPC分类号： B22D11/06
摘要： PURPOSE:To secure the adhesion of a side weir and cooling rolls and prevent casting defect by using limiting plates having shrinkable both of side edges in a twin roll type continuous casting having the limiting plates whose tip parts come into contact with the outer peripheral surfaces of a pair of the cooling rolls and both sides come into contact with the side weirs. CONSTITUTION:At the time of forming a molten metal pouring basin part by pouring the molten metal into a continuously cast mold constituted by pressing the side weirs 3, 3 to both end surfaces 1A, 1A of one pair of the cooling rolls 1, 1 mutually arranged in horizontal and parallel directions, by using the limiting plates 4, 4 whose tip parts are brought into contact with the outer peripheral surfaces 1B, 1B of the cooling roll and both of side edges 6, 6 are brought into contact with the side weirs 3, 3 and the surface of the molten metal basin part and the outer peripheral surfaces 1B, 1B of the cooling rolls are separated. Then, the molten metal pouring basin part is constituted so as to use the limiting plates 4, 4 having shrinkable both side edges. Therefore, the casting can be executed without generating enclosing of the scum and the surface roughness of the cast strip caused by the waving of the molten metal.

63. 发明专利

JPH0525548A PRODUCTION OF CR-NI STAINLESS STEEL SHEET EXCELLENT IN MATERIAL AND SURFACE QUALITY 失效
公开(公告)号：JPH0525548A
公开(公告)日：1993-02-02
申请号：JP29300091
申请日：1991-11-08
申请人： NIPPON STEEL CORP
发明人： TERAOKA SHINICHI , UEDA MASANORI , UEJIMA YOSHIYUKI , SUEHIRO TOSHIYUKI , ARAI TAKASHI , OKA HIDETAKA
IPC分类号： B21B3/02 , B22D11/06 , B22D11/124 , C21D8/00 , C21D8/02 , C21D9/46 , C22C38/00 , C22C38/44
摘要： PURPOSE:To efficiently produce a stainless steel sheet excellent in surface quality and workability with superior productivity by specifying the components of the stainless steel and the temp. of a cast slab, respectively, at the time of directly casting a Cr-Ni stainless steel into sheet-like state and then working it into a sheet by means of cold rolling. CONSTITUTION:A molten Cr-Ni stainless steel represented by 18%Cr-8%Ni steel is directly subjected to continuous annealing into a sheet-like continuously cast slab of =20 deg.C/sec cooling rate in a secondary cooling zone, followed by heat treatment at 1000-1200 deg.C for 20-180sec, if necessary. After descaling by acid pickling, the cast slab is cold-rolled and subjected to cold rolled sheet annealing and further to pickling or bright annealing, by which the stainless steel sheet can be produced. At this time, the sheet excellent in surface roughness can stably be obtained by regulating the Md30 of stainless steel components represented by equation I and the delta-FeCal represented by equation II to 30-50 deg.C and 0-10%, respectively.

64. 发明专利

JPH04266460A SECONDARY COOLING METHOD IN TWIN ROLL TYPE STRIP CONTINUOUS CASTING 失效
公开(公告)号：JPH04266460A
公开(公告)日：1992-09-22
申请号：JP2487391
申请日：1991-02-19
申请人： NIPPON STEEL CORP
发明人： MIYAZAWA KENICHI , UEJIMA YOSHIYUKI , YASUDA KAZUMI , SHIO KIYOMI
IPC分类号： B22D11/06
摘要： PURPOSE:To prevent breakage of a cast strip and the development of fold flaw by forcedly cooling the whole of the cast strip slidingly shifted on a sliding guide together with the sliding CONSTITUTION:The cast strip 6 fed out from twin rolls 1-1, 1-2 is supported with the sliding guide with upper part of the sliding guide 11 and slidingly shifted on the sliding guide 11 from upper part to diagonally lower part. By using upper face nozzles 9 and lower face nozzles 10, spray of cooling medium is injected to the whole of the cast strip 6 slidingly shifted on the sliding guide 11 and the sliding guide 11, the cast strip is cooled. By this method, the cast slab is uniformly cooled without breakage and further, abutting of steam on the surface of twin roll is prevented and the development of fold flaw on the cast strip is prevented.

65. 发明专利

JPH03291139A PRODUCTION OF LOW CARBON STEEL CAST STRIP WITH TWIN ROLL CASTING METHOD 失效
公开(公告)号：JPH03291139A
公开(公告)日：1991-12-20
申请号：JP9187590
申请日：1990-04-06
申请人： NIPPON STEEL CORP
发明人： UEJIMA YOSHIYUKI , AMADA KATSUMI , MIZOGUCHI TOSHIAKI , MIYAZAWA KENICHI
IPC分类号： B22D11/06 , B22D11/00 , C21C7/00 , C21C7/068 , C22C33/04
摘要： PURPOSE:To produce a cast strip without developing blister and breakage of the strip by adjusting product of C concn. and O concn. dissolved in low carbon molten steel containing the specific content of C to the specific value or lower. CONSTITUTION:After adjusting the product of carbon concn. [%C] and oxygen concn. [%O] dissolved in the low carbon molten steel containing 0.001 - 0.1% C to , the steel is cast. As drawing velocity of the cast strip is very fast, solidification is rapidly progressed and C and O is remarkably segregated and concn. product of C X O exceeds the solubility and CO bubbles generate. This causes the blister. By making concn. product of C X O low, the development of blister is prevented and the strip casting is stably executed without developing breakage of the cast strip.

66. 发明专利

JPH03291136A PRODUCTION OF CARBON STEEL HAVING FINE FERRITIC CRYSTAL GRAIN STRUCTURE WITH STRIP CONTINUOUS CASTING METHOD 失效
公开(公告)号：JPH03291136A
公开(公告)日：1991-12-20
申请号：JP8921490
申请日：1990-04-05
申请人： NIPPON STEEL CORP
发明人： UEJIMA YOSHIYUKI , SAWAI TAKASHI , AMADA KATSUMI , MIZOGUCHI TOSHIAKI
IPC分类号： B22D11/06
摘要： PURPOSE:To obtain a carbon steel having fine ferritic crystal grain structure by adding at least one kind of Ti, Zr, Hf, Y, La and Ce in molten steel and specifying this concn. and contained ranges of Mn and S. CONSTITUTION:At least one kind of Ti, Zr, Hf, Y, La and Ce is added in the molten steel and this concn. [%X] satisfies the inequality I and also [%Mn] X[%S] is incorporated so as to be within the range of 5X10 - 5X10 . By cast strip continuous casting method, the cast strip is rapidly cooled and inclusions of oxide and sulfide series precipitated combined with additive and Mn, are extremely fine and growth of the coarse crystal grains is restricted to make the crystal grains fine. The cast strip is made to fine ferritic structure and has excellent surface characteristic and workability.

67. 发明专利

JPH03287741A MANUFACTURE OF TOUGH AND HARD STEEL 失效
公开(公告)号：JPH03287741A
公开(公告)日：1991-12-18
申请号：JP8999690
申请日：1990-04-04
申请人： NIPPON STEEL CORP
发明人： YOSHIE ATSUHIKO , UEJIMA YOSHIYUKI , SAWAI TAKASHI , ONOE YASUMITSU
IPC分类号： B22D11/124 , C21D6/00 , C22C33/00
摘要： PURPOSE:To manufacture a tough and hard steel excellent in strength and toughness and constituted of a fine structure, in a steel contg. specified ratios of C, Si, Mn, Al, Ti, S, etc., by specifying the content of oxygen in the state of molten steel and its cooling treatment. CONSTITUTION:In a steel contg., by weight, 0.02 to 0.25% C, 0,05 to 0.6% Si, 0.30 to 3.5% Mn, =1 deg.C/sec to

68. 发明专利

JPH01228643A METHOD FOR UNIFORMLY AND FINELY DISPERSING-PRECIPITATING MNS IN STEEL 失效
公开(公告)号：JPH01228643A
公开(公告)日：1989-09-12
申请号：JP5345888
申请日：1988-03-09
申请人： NIPPON STEEL CORP
发明人： SAWAI TAKASHI , YUYAMA HIDETOSHI , UEJIMA YOSHIYUKI , MIZOGUCHI SHOZO
IPC分类号： B22D11/00 , B22D11/124 , C21C7/04 , C21C7/06
摘要： PURPOSE:To uniformly and finely disperse MnS in a cast slab by adding one kind of deoxidizing element into molten steel limiting dissolved oxygen concn. after adjusting the components so as to come to the limited wt.%, casting the cast slab and specifying condition of average cooling speed at the prescribed thickness position in the cast slab. CONSTITUTION:The deoxidizing element of at least one kind among Zr, Ti, Ce, Y and Hf is added so as to come to 0.01-0.05wt.% and the molten steel is rapidly poured into a mold to cast the cast slab. Successively, the average cooling speed at 1/2 of thickness in the cast slab is cooled under holding to >=50 deg.C/min in the temp. range from the liquids temp. to 1,400 deg.C and 1-50 deg.C/min in the temp. range of 1,400-1,300 deg.C. By this method, MnS in the steel is finely dispersed and precipitated to improve HAZ toughness for large sized structure material, and also the steel having excellent cold crack resistance, erosion resistance, high temp. creep strength and bending workability can be obtd.

69. 发明专利

JPS61157612A CONTROLLING METHOD OF SOLIDIFICATION SEGREGATION OF STEEL 失效
公开(公告)号：JPS61157612A
公开(公告)日：1986-07-17
申请号：JP27435184
申请日：1984-12-28
申请人： NIPPON STEEL CORP
发明人： UEJIMA YOSHIYUKI , KOMATSU NOBUYUKI , MIZOGUCHI SHOZO
IPC分类号： B22D1/00 , B22D7/00 , B22D11/10 , B22D11/108 , B22D11/124 , C21C7/00 , C21C7/04 , C21D1/84
摘要： PURPOSE:To control effectively the dendritic segregation and the adding one and more kinds of Be, Cr, Nb, Sn, Ti and V in the specified quantity into a molten steel in the casting of middle or low carbon steel. CONSTITUTION:In the casting of carbon steel contg.

70. 发明专利

JPS61154748A METHOD FOR CONTROLLING SOLIDIFICATION SEGREGATION OF CONTINUOUS CASTING STEEL INGOT 失效
公开(公告)号：JPS61154748A
公开(公告)日：1986-07-14
申请号：JP27435284
申请日：1984-12-28
申请人： NIPPON STEEL CORP
发明人： UEJIMA YOSHIYUKI , KOMATSU NOBUYUKI , MIZOGUCHI SHOZO
IPC分类号： B22D1/00 , B22D7/00 , B22D11/10 , B22D11/108 , B22D11/124
摘要： PURPOSE:To control effectively solidification segregation, more particularly the overlap segregation among trees in the stage of solidification and to obtain a product having good quality in continuous casting of a carbon steel having a specific value or below of C concn. by adding a prescribed ratio of Mo into the molten steel. CONSTITUTION:Mo is added at

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