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71. 发明专利

JPS5584202A SURFACE CRACKING SUPPRESSING METHOD OF SLAB IN HOT ROLLING 失效
公开(公告)号：JPS5584202A
公开(公告)日：1980-06-25
申请号：JP15666878
申请日：1978-12-19
申请人： NIPPON STEEL CORP
发明人： SUZUKI HIROO , NISHIMURA SATORU
IPC分类号： B21B1/00 , B21B1/02 , B21B45/02 , C21D8/02
摘要： PURPOSE:To effectively suppress surface cracking by reheating and rolling a slab after cooling the slab once down to the specified temperature in the cooling process in succession to melting and solidifying in direct feed rolling, etc. of the slab. CONSTITUTION:In direct feed rolling or hot charge rolling of a slab, the slab is once cooled down to right below the Ar1 point in the cooling process in succession to melting and solidifying, whereby harmful deposits are made harmless. Next, this slab is reheated and rolled. Thereby the slab surface cracking in hot rolling may be effectively suppressed.

72. 发明专利

JPS5449930A PREVENTION OF SURFACE CRACKING OF CAST STRIP FOR ELECTROMAGNETIC STEEL 失效
公开(公告)号：JPS5449930A
公开(公告)日：1979-04-19
申请号：JP11550877
申请日：1977-09-28
申请人： NIPPON STEEL CORP
发明人： HAYAMIZU TETSUHIRO , YAMAGUCHI SHIGEHIRO , SUZUKI HIROO
IPC分类号： B22D11/00 , B22D11/12 , B22D11/128

73. 发明专利

JPS5214515A ALLOYS EXCELLENT IN BOTH STRENGTH AND CORROSIVEERESISTANCE PRODUCTION OF THE SAME 失效
公开(公告)号：JPS5214515A
公开(公告)日：1977-02-03
申请号：JP9021375
申请日：1975-07-25
申请人： NIPPON STEEL CORP
发明人： NANUN MICHIHIKO , SUZUKI HIROO , TAKAHASHI TOSHIHIKO , ARAI TETSUO , SHIMADA HARUO
IPC分类号： C22C1/00 , C22C1/02 , C22C5/04 , C22C19/05 , C22C19/07 , C22C30/00 , C22C38/00 , C22C38/12 , C22C38/22 , C22C38/58 , C22C45/02 , C22C45/04
摘要： PURPOSE:To provide quenched and solidified alloy s containing amorphous substances, which are suitable for use in air and sea water or an oxidizing atmosphere.

74. 发明专利

JPS51114319A ALLOY WITH EXCELLENT PROPERTIES IN STRENGTH AND CORROSION NESSTANCE 失效
公开(公告)号：JPS51114319A
公开(公告)日：1976-10-08
申请号：JP3851875
申请日：1975-04-01
申请人： NIPPON STEEL CORP
发明人： NANUN MICHIHIKO , SUZUKI HIROO , TAKAHASHI TOSHIHIKO , ARAI TETSUO , WAKITA NOBUO , SHIMADA HARUO , SATOU SHIYUN
IPC分类号： C22C45/02 , C22C38/00 , C22C45/04
摘要： PURPOSE:To produce an alloy having high strength and excellent corrosion resistance property, which has amorphous or amorphous like structure.

75. 发明专利

JPH05230561A PRODUCTION OF TITANIUM-BASED INTERMETALLIC COMPOUND 失效
公开(公告)号：JPH05230561A
公开(公告)日：1993-09-07
申请号：JP3676692
申请日：1992-02-24
申请人： NIPPON STEEL CORP , KYORITSU CERAMIC MATERIALS
发明人： SUZUKI HIROO , OIE TADASHI
IPC分类号： B22F3/10 , B22F3/14 , B22F3/15 , B22F3/23 , C22C1/00 , C22C1/02 , C22C1/04
摘要： PURPOSE:To easily obtain a material excellent in spreadability and toughness by charging a green compact of a powder mixture for which respective contents of impurities, such as O, C, and N, are limited and which is composed essentially of Ti and Al into a vessel having slightly larger size, performing self-burning, and then applying hot working, etc., without bringing the compact into contact with the air. CONSTITUTION:The powder mixture of Ti and Al for which the contents of O, C, N, H, and Cl as impurities are limited to to 5X10 Torr, and heating is applied to allow sintering and synthesis to proceed. Then, hot isostatic pressing or hot working is applied to obtain Ti-Al based raw material.

76. 发明专利

JPH0570873A TIAL-BASE INTERMETALLIC COMPOUND ALLOY WITH TWO GAMMA-AND BETA-PHASES 失效
公开(公告)号：JPH0570873A
公开(公告)日：1993-03-23
申请号：JP9832291
申请日：1991-01-31
申请人： NIPPON STEEL CORP
发明人： MATSUO SOJI , MASAHASHI NAOYA , HASHIMOTO KEIZO , HANAMURA TOSHIHIRO , FUJII HIDEKI , KIMURA MASAO , MIZUHARA YOJI , SUZUKI HIROO
IPC分类号： C22C14/00 , C22F1/00 , C22F1/18
摘要： PURPOSE:To improve the strain rate sensitivity exponent m-value and fracture elongation of a TiAl-base intermetallic compound alloy. CONSTITUTION:The alloy has a basic composition represented by TiYAlCrX by atomic ratio (where 1% =100%) and also has a fine structure where beta-phases are precipitated in the grain boundaries of equiaxied gamma-grains of >=30mum grain size. This alloy has superplastic phenomena of >=0.40 m-value by stretching at 1200 deg.C at 5X10 s strain rate and >=400% fracture elongation.

77. 发明专利

JPH04235232A PRODUCTION OF HIGH STRENGTH TITANIUM ALLOY 失效
公开(公告)号：JPH04235232A
公开(公告)日：1992-08-24
申请号：JP189691
申请日：1991-01-11
申请人： NIPPON STEEL CORP
发明人： SUZUKI HIROO , TAKEUCHI MAKOTO , TSUCHIYA KATSURA , TANAKA HIROSHI , FUJISAWA KAZUO
IPC分类号： B22F3/14 , C22C1/04 , C22C14/00
摘要： PURPOSE:To produce a high strength titanium alloy capable of withstanding use for automobile parts, marine or ship parts, parts for general structural use, etc. CONSTITUTION:A titanium powder having =60% density by means of pressing at room temp. or cold isostatic pressing(CIP), burnt at 1100-1500 deg.C for >=30min, and further subjected, after burning, to hot isostatic pressing(HIP) treatment at a temp. between (beta-transformation temp. -150 deg.C) and (beta-transformation temp. +250 deg.C). By this method, the titanium alloy of the component series which cannot be produced by the conventional melting method owing to solidification segregation can be obtained by a new production method without recourse to the melting method.

78. 发明专利

JPH0428834A MANUFACTURE OF TI-AL SERIES STOCK 失效
公开(公告)号：JPH0428834A
公开(公告)日：1992-01-31
申请号：JP13435290
申请日：1990-05-24
申请人： NIPPON STEEL CORP , KYORITSU CERAMIC MATERIALS
发明人： SUZUKI HIROO , FUJII HIDEKI , OIE TADASHI
IPC分类号： B22F3/10 , B22F3/23 , C22C1/04 , C22C14/00
摘要： PURPOSE:To improve the hot workability, cold workability, room temp. ductility, etc., of Ti-Al series stock by suppressing the content of O, C, N, H and Cl as impurity elements in Ti and Al powder as a raw material to specified one or below. CONSTITUTION:As raw material powder, the powder essentially consisting of Ti and Al is used. The powder is prepd. in such a manner that the content of each impurity in Ti and Al is suppressed to, by weight, to 5X10 Torr at a temp. in which the mixed powder starts self burning or above. Heat input is executed to start a synthetic reaction, and the generated heat of reaction is successively propagated through unreacted powder. In the powder essentially consisting of Ti and Al, its powder grain size is preferably prescribed to

79. 发明专利

JPH03193851A PRODUCTION OF TIAL-BASE ALLOY HAVING EXTREMELY SUPERFINE STRUCTURE 失效
公开(公告)号：JPH03193851A
公开(公告)日：1991-08-23
申请号：JP33578189
申请日：1989-12-25
申请人： NIPPON STEEL CORP
发明人： FUJII HIDEKI , SUZUKI HIROO , HASHIMOTO KEIZO , MIZUHARA YOJI
IPC分类号： C22F1/18 , C22C14/00 , C22F1/00
摘要： PURPOSE:To prevent the coarsening of a structure, to secure sufficient draft, and to obtain a Ti-Al-base alloy having an extremely fine structure by subjecting a Ti-Al alloy with a specific composition to hot working in a temp. region where plural phases coexist, in vacuum or in an inert gas at a specific draft. CONSTITUTION:A Ti-Al alloy having a composition containing, by weight, 31-38% Al and 60-70% Ti or a Ti-Al alloy further containing 3-5% Cr for accelerating the refining of structure or improving mechanical properties and workability and also =95% by volume in the equilibrium state at room temp. in order to avoid an acicular structure causing deterioration in ductility at room temp. and workability and which is composed of plural phases, such as (alpha+gamma) phase or (alpha+gamma+beta) phase, is worked in vacuum or in an inert-gas atmosphere at 10-50% draft, or further, working is applied to the above alloy in a gamma-single phase temp. region at >=10% draft. By this method, the Ti-Al alloy having extremely fine structure can be obtained.

80. 发明专利

JPH0266142A MANUFACTURE OF PLATE STOCK, BAR STOCK, AND WIRE ROD OF ALPHA PLUS BETA TITANIUM ALLOY 失效
公开(公告)号：JPH0266142A
公开(公告)日：1990-03-06
申请号：JP21503488
申请日：1988-08-31
申请人： NIPPON STEEL CORP
发明人： FUJII HIDEKI , SUZUKI HIROO , YAMASHITA YOSHITO , YAMAKI TAKAO , KISHIDA KOJI
IPC分类号： C22F1/18 , C22F1/00
摘要： PURPOSE:To manufacture a homogeneous alpha+beta titanium alloy plate stock, etc., having fine structure at a low cost by heating and holding an alpha+beta titanium alloy up to a temp. of the beta-transus or above, cooling the above alloy, and then applying working to the above alloy at a temp. in a specific region at a specific draft. CONSTITUTION:The alpha+beta titanium alloy is heated up to a temp. between (beta-transus of the alloy)+250 deg.C and beta-transus and held at the above temp. Subsequently, the above alloy is cooled down to a temp. between beta-transus and Ms point + 5 deg.C or the initial temp. of alpha-phase precipitation in a continuous cooling transformation diagram of this alloy. Then, the above alloy is subjected to working in the above temp. region at >=70% total draft. It is preferable that, when the working temp. is high, annealing is carried out at a temp. between beta-transus-30 deg.C and 650 deg.C after the above working. Further, it is preferable that, when the working temp. is low, cooling is performed without delay at a rate of 10 deg.C per second and ageing treatment is carried out at a temp. between 450 deg.C and the working temp. By this method, the plate stock, bar stock, and wire rod of the homogeneous alpha+beta titanium alloy having equiaxial superfine alpha-grain structure and minimal in material anisotropy can be obtained.

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