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72. 发明专利

JPH08253838A METHOD FOR REDUCING SOFT INCLUSION HAVING LOW MELTING POINT IN LOW SILICON STEEL 失效
公开(公告)号：JPH08253838A
公开(公告)日：1996-10-01
申请号：JP8352495
申请日：1995-03-16
申请人： DAIDO STEEL CO LTD
发明人： NAKAYAMA TAKASHI , MATSUBUCHI SHUJI , FURUSE TAISUKE
IPC分类号： C22C33/06 , C22C38/06
摘要： PURPOSE: To provide a method for reducing soft inclusions having the low m.p. easy to form in low Si steel. CONSTITUTION: Low alloy heat resistance steel, stainless steel and heat resistant steel having low Si are incorporated with 0.005 to 0.010% Sol.Al. Thus, soft inclusions are hardened and made smaller in diameter, and defects caused by the inclusions can be prevented.

73. 发明专利

JPH08232044A STEEL SHEET EXCELLENT IN TOUGHNESS IN WELD HEAT-AFFECTED ZONE AND ITS PRODUCTION 失效
公开(公告)号：JPH08232044A
公开(公告)日：1996-09-10
申请号：JP31579295
申请日：1995-11-10
申请人： NIPPON STEEL CORP
发明人： ITO AKIRA , MINAGAWA MASANORI , ISHIKAWA TADASHI , HASEGAWA TOSHINAGA
IPC分类号： B22D11/00 , B22D1/00 , B22D11/10 , B22D11/108 , B22D27/20 , C22C33/06 , C22C38/00 , C22C38/06 , C22C38/54
摘要： PURPOSE: To obtain a steel material excellent in toughness in a weld heat- affected zone by deoxidizing a molten steel having a specific composition free from the addition of Al other than inevitably contained Al, adding Mg, and then performing casting and rolling. CONSTITUTION: The steel material has a composition which consists of, by weight, 0.03-0.20% C, =Al/20 is satisfied. This steel material can be obtained by deoxidizing a molten steel, in a state free from the addition of Al other than inevitably contained Al, with Mn and Si, adding Mg in a tundish or mold so that Mg>=Al/20, by the analyzed values of the finally obtained steel sheet, is satisfied, and performing casting and rolling. Further, Cu, Ni, Nb, v, Cr, Mo, and B are added to this steel material, if necessary.

74. 发明专利

JPH08120401A STEEL MATERIAL EXCELLENT IN INTERNAL QUALITY AND ITS PRODUCTION 失效
公开(公告)号：JPH08120401A
公开(公告)日：1996-05-14
申请号：JP7209095
申请日：1995-03-29
申请人： NIPPON STEEL CORP
发明人： MABUCHI HIDESATO , TOMITA YUKIO , HASEGAWA TOSHINAGA , HAMADA KAZUSHI
IPC分类号： C22C33/06 , C22C38/00 , C22C38/14 , C22C38/54 , C22C38/58
摘要： PURPOSE: To prevent the occurrence of hydrogen induced ultrasonic flaw defects and to improve the internal quality of a starting steel plate by adding REM and/or Y and Zr and allowing them to enter into solid solution. CONSTITUTION: REM and/or either or both of Y and Zr, in the state of solid solutions, are allowed to exist by 1-100ppm in a steel having a composition consisting of, by weight ratio, 0.02-1.0% C, 0.03-1.0% Si, 0.30-2.0% Mn, =2 elements among Al, Ti, and Ca into the steel composition. Moreover, if necessary from the viewpoint of strength, Co, Ni, Cr, Mo, W, etc., can be added.

76. 发明专利

JPH07331380A PRODUCTION OF PARE EARTH-IRON COMPOUND 失效
公开(公告)号：JPH07331380A
公开(公告)日：1995-12-19
申请号：JP12268694
申请日：1994-06-03
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： TAKAHASHI TAKESHI , KOJIMA SEIJI
IPC分类号： C21D6/00 , C22C33/06 , H01F1/053 , H01F1/057
摘要： PURPOSE:To provide a method for producing a rare earth-iron compound capable of producing a rate earth-iron compound having the objective compsn. in which the reaction between a crucible and rare earth elements is suppressed in a melting and casting stage in the production of a rare earth-iron compound, deviation in the compsn. is prevented and a rare earth-iron compound having the objective compsn. is producible. CONSTITUTION:At the time of arranging plural iron lumps 2 and 3 at the inside of a crucible 1, at least as for the part along the inside wall of the crucible 1, small lumpy iron 2 having =10mm thickness, and thereafter, the temp. of the arranging iron lumps 2 and 3 is raised. After the temp. of the iron lumps 2 and 3 is raised to the eutectic temp. in the rare earth-iron series or above, the rare earth elements are added and fed in the inside of the crucible, the rare earth elements are brought into reaction with the iron lumps 2 and 3, and dissolved to prevent the substantial contact of the rare earth element simple substance with the inside wall of the crucible 1.

78. 发明专利

JPH03177535A MANUFACTURE OF LOW TEMPERATURE HIGH TOUGHNESS STEEL FOR WELDING 失效
公开(公告)号：JPH03177535A
公开(公告)日：1991-08-01
申请号：JP31467089
申请日：1989-12-04
申请人： NIPPON STEEL CORP
发明人： HASEGAWA TOSHINAGA , YAMAMOTO KOICHI , AIHARA SHUJI , OKAMOTO KENTARO
IPC分类号： C22C33/04 , C22C33/06 , C22C38/00 , C22C38/06
摘要： PURPOSE:To manufacture the low temp. high toughness steel for welding having high safety under severe using conditions by adding specified amounts of Ti and Y to a molten steel having a specified compsn. constituted of C, Si, Mn, S, N, Al, P, O and Fe and thereafter executing solidification. CONSTITUTION:In a molten steel constituted of, as basic components, by weight, 0.02 to 0.18% C,

79. 发明专利

JPH02179863A NITRIDING TREATMENT FOR METAL 失效
公开(公告)号：JPH02179863A
公开(公告)日：1990-07-12
申请号：JP33564888
申请日：1988-12-28
申请人： TOCHIGI PREFECTURE
发明人： ISHIJIMA KENJI , TOMURO KOJI , EDANO TATSUYUKI
IPC分类号： C23C8/02 , C22C33/06 , C23C8/38 , C23C8/56
摘要： PURPOSE:To obtain a nitrided layer free from the formation of oxide film and having sufficiently high hardness by adding Mn, Cr, Si, B, Ti, V, Mo, Co, Hf, Nb, Sb, etc., to a molten metal stock and then applying nitriding treatment to the above. CONSTITUTION:In the course of the melting of a metal stock, one or more additives among Mn, Cr, Si, B, Ti, V, Mo, Co, Hf, Nb, and Sb are added to undergo mixing and agitation. Suitable additive quantities are, e.g. about 1.0-2.0% Mn, about 0.05-2.0% Cr, about 1.0-4.0% Si, and about 0.01-1.0% B, and it is desirable that they are added in the form of ferroalloy, such as Fe-Mn. Further, besides the above additives, one or more kinds among Ca-Si, Fe-Si, Fe-Mg, and Ni-Mg may be added as inoculants. Then, the metal stock into which the additives, etc., are mixed is subjected to nitriding treatment, such as plasma nitriding and soft nitriding. By this method, nitriding reaction can be selectively accelerated and the formation of oxide film can be perfectly prevented, by which the nitrided layer having high hardness and excellent in wear resistance and scuffing resistance can be formed.

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