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31. 发明专利

JPS62130216A PRODUCTION OF ACCELERATED COOLING TYPE THICK, HIGH TOUGHNESS, HIGH TENSILE STEEL SHEET 失效
公开(公告)号：JPS62130216A
公开(公告)日：1987-06-12
申请号：JP27110085
申请日：1985-12-02
申请人： KOBE STEEL LTD
发明人： KAJI HARUO , AKIYAMA KENSHO , IWAI KIYOSHI
IPC分类号： C21D8/00 , B21B3/00 , C21D8/02 , C22C38/00 , C22C38/14
摘要： PURPOSE:To obtain a high tensile steel sheet having a high toughness value and tensile strength and large sheet thickness by specifying the heating temp. range of a slab in addition to addition of a slight amt. of Ti and subjecting the slab to controlled rolling then to accelerated cooling. CONSTITUTION:The steel slab contg., by weight %, =1 deg.C/sec to obtain the accelerated cooling type thick, high toughness, high tensile steel sheet having 40-100mm thickness. Said steel sheet has the high toughness value and has excellent characteristics including >=50kg/mm tensile strength.

32. 发明专利

JPS62120458A ACCELERATEDLY COOLED 50KGF/MM2 STEEL PLATE SUPERIOR IN WELDABILITY AND ITS MANUFACTURE 失效
公开(公告)号：JPS62120458A
公开(公告)日：1987-06-01
申请号：JP26214985
申请日：1985-11-20
申请人： KOBE STEEL LTD
发明人： KANANO MOTOMI , KAJI HARUO , TAKASHIMA NOBUTSUGU , AKIYAMA KENSHO , IWAI KIYOSHI , ABE KENGO
IPC分类号： C21D9/52 , C22C38/00 , C22C38/06 , C22C38/14
摘要： PURPOSE:To manufacture high strength acceleratedly cooled steel plate superior in weldability for ship building, by stopping the cooling of steel composed of C, Si, Mn, Al and Fe while specifying compsn. relation at a specified temp. range. CONSTITUTION:Steel composed of, by weight 0.05-0.20% C, 0.01-0.60% Si, 0.30-1.80% Mn, 0.005-0.10% Al further if necessary, one kind or more among 0.005-0.020% and/or 0.0005-0.0050% Ca and 0.0005-0.0050% Ce and the balance iron with inevitable impurity is acceleratedly cooled. Further in the component compsn., Mn is regulated so that Mn>=-10.5C+2.3 is satisfied in the C quantity range, and Mn

33. 发明专利

JPS6256554A ACCELERATED COOLING STEEL PLATE CAUSING NO UST DEFECT IN HEAT AFFECTED ZONE OF HIGH HEAT INPUT WELDING 失效
公开(公告)号：JPS6256554A
公开(公告)日：1987-03-12
申请号：JP19653985
申请日：1985-09-04
申请人： KOBE STEEL LTD
发明人： KANANO MOTOMI , KAJI HARUO , TAKASHIMA NOBUTSUGU , AKIYAMA KENSHO , IWAI KIYOSHI , KONDO AKIO
IPC分类号： C22C38/00 , C22C38/04 , C22C38/44 , C22C38/54 , C22C38/58
摘要： PURPOSE:To manufacture an accelerated cooling steel plate causing no UST defect in a weld-heat affected zone by minimizing the S content of a welding steel plate and by adding trace amounts of Ca of REM so as to reduce the amounts of MnS-type inclusions and carry out the congiguration control of the above inclusions. CONSTITUTION:The accelerated cooling steel plate to be subjected to highly efficient high heat imput welding has a composition as in the following: the steel contains, by weight, as principal components, , UST defect can be prevented from occurring in the weld-heat affected zone.

34. 发明专利

JPS6063318A PRODUCTION OF ACCELERATIVELY COOLED STEEL MATERIAL HAVING HIGH TOUGHNESS 失效
公开(公告)号：JPS6063318A
公开(公告)日：1985-04-11
申请号：JP17160483
申请日：1983-09-16
申请人： KOBE STEEL LTD
发明人： KASAMATSU YUTAKA , KAJI HARUO , TAKASHIMA NOBUTSUGU , AKIYAMA KENSHIYOU , IWAI KIYOSHI
IPC分类号： B21B3/00 , C21D8/00 , C21D8/02 , C22C38/00
摘要： PURPOSE:To enable production of an acceleratively cooled steel material having high toughness by adding and incorporating a specific amt. of Ti into a steel having >=770 deg.C Ar3 transformation point and subjecting the steel to hot rolling and succeeding cooling treatment under specific conditions. CONSTITUTION:A steel slab contg. 0.05-0.20% C, 0.01-0.50% Si, 0.50-1.60% Mn, 0.005-0.020% Ti and 0.0020-0.0080% N or contg. at least one kind selected from =770 deg.C Ar3 point is heated to 1,050-1,250 deg.C. The slab is hot rolled under the conditions of 30-50% draft at =3 deg.C/sec. The formation of coarse grains of an austenite phase is prevented by the presence of Ti and the acceleratively cooled steel material having

35. 发明专利

JPS5332815A NBBCONTAINING STEEL FOR LARGE HEAT INPUT WELDING 失效
公开(公告)号：JPS5332815A
公开(公告)日：1978-03-28
申请号：JP10834576
申请日：1976-09-08
申请人： KOBE STEEL LTD
发明人： KASAMATSU YUTAKA , TAKASHIMA SHIYUUJI , HOSOYA TAKASHI , IWAI KIYOSHI
IPC分类号： C22C38/00 , C21D6/00 , C22C38/04
摘要： PURPOSE:To provide a Nb-contg. steel for large heat input welding by adding C, Mn, and Nb and limiting Si content to 0.09% or less and C+10.N to 0.12% or less.

36. 发明专利

JPH0657371A LOW YIELD RATIO FIRE RESISTANT BUILDING STEEL EXCELLENT IN WELDABILITY 失效
公开(公告)号：JPH0657371A
公开(公告)日：1994-03-01
申请号：JP23771992
申请日：1992-08-13
申请人： KOBE STEEL LTD
发明人： YANO KAZUHIKO , IWAI KIYOSHI , NAKATANI YOSHIYUKI
IPC分类号： C22C38/00 , C22C38/14 , C22C38/50
摘要： PURPOSE:To develop low yield ratio building steel having proof stress at a high temp. as well as excellent weldability by subjecting a low carbon steel contg. small amounts of Nb, Ti, N or the like to hot rolling, thereafter subjecting it to controlled cooling to form the structure of its base metal into a one essentially consisting of bainite and subsequently executing tempering. CONSTITUTION:A slab having a compsn. contg., by weight, 0.05 to 0.20% C, 0.05 to 0.60% Si, 0.50 to 1.80% Mn, 0.020% or less P, 0.005% or less S, 0.004 to 0.020% Nb and 0.0020 to 0.0070% N and in which the carbon equivalent (Ceq) expressed by the formula I is regulated to 0.40% or below or furthermore contg. one or two kinds among 0.05 to 0.40% Cu, Ni, Cr and Mo, 0.005 to 0.06% V and 0.0005 to 0.0050% Ca and in which the carbon equivalent expressed by the formula II is regulated to 0.40% or below is subjected to hot rolling into steel. After that, this steel is subjected to controlled cooling to suppress the precipitation of Nb, and in such a manner that the strengthening of the transformation by solid solution Nb is activated, the structure of its base metal is formed into a one essentially consisting of bainite. After that, tempering is executed to precipitate fine Nb carbonitrides having 80% bainite structural fraction and smaller than 200Angstrom average grain size by the amt. of 1X10 pieces/mm .

37. 发明专利

JPH04272133A PRODUCTION OF STEEL PLATE HARDLY CAUSING UT DEFECT IN HIGH HEAT INPUT WELDED SQUARE JOINT PART OF STEEL-FRAME BOX PILLAR 失效
公开(公告)号：JPH04272133A
公开(公告)日：1992-09-28
申请号：JP3453691
申请日：1991-02-28
申请人： KOBE STEEL LTD
发明人： YANO KAZUHIKO , SHIMIZU MASATO , IWAI KIYOSHI , OKANO SHIGEO
IPC分类号： C21D8/02 , C22C38/00 , C22C38/06
摘要： PURPOSE:To regulate segregation and A type inclusions in a steel plate and to obtain a steel plate hardly causing defects detected by ultrasonic flaw detection due to heat-affected zone cracking in the high heat input welded square joint part of a steel-frame box pillar by subjecting steel having a specified compsn. to continuous casting, specified heating and rolling. CONSTITUTION:Molten steel consisting of, by weight, 0.10-0.20% C, 0.05-0.50% Si, 0.50-1.80% Mn, =1,280 deg.C for >=8hr and rolled. By this method, the difference in hardness Hv between the nonsegregated and segregated parts is regulated to

38. 发明专利

JPH04180518A PRODUCTION OF 50KGF/MM2 CLASS REFRACTORY STEEL FOR BUILDING HAVING EXCELLENT TOUGHNESS OF LARGE HEAT INPUT WELDED JOINT 失效
公开(公告)号：JPH04180518A
公开(公告)日：1992-06-26
申请号：JP30999090
申请日：1990-11-14
申请人： KOBE STEEL LTD
发明人： YANO KAZUHIKO , IWAI KIYOSHI , SHINOZAKI KAORU
IPC分类号： C21D8/00 , C22C38/00 , C22C38/28
摘要： PURPOSE:To improve high-temp. yield strength and to impart excellent toughness of a large heat input welded joint by heating a slab which consists of a Cr-Mo system as a basic compsn. and is limited in the value of PCM to a specific temp., and rolling this slab at a specified draft and end temp. CONSTITUTION:The compsn. of the refractory steel for buildings is composed of 0.05 to 0.15% C, 0.05 to 0.60% Si, 0.50 to 1.50% Mn, =1050 deg.C and is rolled at >=50% draft at class refractory steel having >=22kgf/mm yield strength at 600 deg.C and the excellent toughness of the large heat input welded joint is obtd. in this way.

39. 发明专利

JPH03173742A ROLLED STEEL FOR WELDING STRUCTURE HAVING EXCELLENT HIGH TEMPERATURE PROOF STRESS AND WELDABILITY 失效
公开(公告)号：JPH03173742A
公开(公告)日：1991-07-29
申请号：JP31293089
申请日：1989-11-30
申请人： KOBE STEEL LTD
发明人： YANO KAZUHIKO , IWAI KIYOSHI , NISHIJIMA AKIHITO
IPC分类号： C22C38/00 , C22C38/12
摘要： PURPOSE:To manufacture the rolled steel for welding structures having excellent high temp. proof stress and weldability by preparing a rolled steel having a specified compsn. in which the content of Mo, Nb and V and weld crack sensitivity compsn. are specified. CONSTITUTION:A rolled steel contg., by weight, 0.05 to 0.15% C, 0.05 to 0.60% Si, 0.50 to 2.00% Mn and >0.20 to 0.70% Mo, furthermore contg. one or 2 kinds of 0.010 to 0.10% Nb and 0.010 to 0.10% V, contg., at need, one or >=2 kinds among 0.05 to 0.50% Cu, 0.05 to 0.50% Ni, 0.05 to 0.70% Cr, 0.005 to 0.070% Ti and 0.0005 to 0.010% Ca and the balance Fe with inevitable impurities as well as in which the weld crack sensitivity compsn. (PcM) shown by formula is prescribed to

40. 发明专利

JPH02163317A MANUFACTURE OF ACCELERATEDLY COOLED STEEL SHEET HAVING SMALL RESIDUAL STRESS 失效
公开(公告)号：JPH02163317A
公开(公告)日：1990-06-22
申请号：JP31986188
申请日：1988-12-19
申请人： KOBE STEEL LTD
发明人： TAKIZAWA KENSABURO , KAJI HARUO , TAKASHIMA NOBUTSUGU , IWAI KIYOSHI
IPC分类号： C21D8/02
摘要： PURPOSE:To manufacture a steel sheet having small residual stress without losing strength increasing effect by accelerated cooling by acceleratedly cooling a hot rolled steel plate from a specified temp. under specified conditions and carrying out rolling with a leveler. CONSTITUTION:A low carbon steel billet is hot rolled and the resulting steel plate is acceleratedly cooled from (the Ar3 point-70 deg.C) or above at >=3 deg.C/sec cooling rate CR and a finished cooling temp. FCT ( deg.C) satisfying FCT =15kgf/mm residual stress in the surface of the steel plate. This steel plate is then rolled with a leveler. An acceleratedly cooled steel sheet having residual stress, superior strength, toughness, weld crack resistance and superior toughness of the weld heat-affected zone is manufactured.

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