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1. 发明专利

JPH064890B2 失效
公开(公告)号：JPH064890B2
公开(公告)日：1994-01-19
申请号：JP23070985
申请日：1985-10-15
申请人： KOBE STEEL LTD
发明人： KAJI HARUO , TAKASHIMA NOBUTSUGU , SHIMOHATA TAKASHI , SHIAKU TOYOAKI
IPC分类号： C21D8/00 , C21D8/02 , C22C38/00 , C22C38/14 , C22C38/16

2. 发明专利

JPH03281754A HIGH MN NON-MAGNETIC STEEL EXCELLENT IN LOCAL DEFORMABILITY 失效
公开(公告)号：JPH03281754A
公开(公告)日：1991-12-12
申请号：JP8257190
申请日：1990-03-28
申请人： KOBE STEEL LTD
发明人： TAKASHIMA NOBUTSUGU , TONE SHOJI , IKEDA SOICHI
IPC分类号： C22C38/00 , C22C38/04
摘要： PURPOSE:To reduce the work hardenability of a non-magnetic steel without impairing its fundamental characteristics and to permet its drilling or deep drawing without cracking by controlling its chemical components, metallic structure and the content of non-metallic inclusions. CONSTITUTION:This high Mn non-magnetic steel is a one contg. 0.15 to 0.70% C, 0.10 to 3.00% Si and 12 to 30% Mn, in which the content of C and Mn furthermore satisfies the inequality and the balance Fe as well as in which the fractional rate of unrecrytallized grains in an austenitic structure is regulated to 50%, the notch elongation is rapidly reduced, and furthermore, as for the cleanliness, in the case of

3. 发明专利

JPH0356617A PRODUCTION OF HIGH TENSILE STEEL EXCELLENT IN TOUGHNESS AT LOW TEMPERATURE 失效
公开(公告)号：JPH0356617A
公开(公告)日：1991-03-12
申请号：JP19020689
申请日：1989-07-21
申请人： KOBE STEEL LTD
发明人： TAKASHIMA NOBUTSUGU , SHIMOHATA TAKASHI
IPC分类号： C21D8/02
摘要： PURPOSE:To provide high strength and superior toughness at low temp. by heating a steel slab having a specific composition containing Nb so that the central part of the steel slab reaches a temp. in a specific range and then carrying out controlled rolling and accelerated cooling. CONSTITUTION:A slab of a steel having a composition containing 0.01-0.15% C, 0.02-0.60% Si, 0.60-2.0% Mn, 0.005-0.060% Al, and 0.005-0.025% Nb is heated for 30-60min so that the central part of the steel slab reaches a temp. in the range between T deg.C calculated from an equation and (T+50) deg.C, that is, the steel slab is heated at a temp. in a region where the coarsening of austenite grains does not occur, and further, Nb is allowed to enter into solid solution completely. This steel slab is rolled at =50% rolling reduction, and rolling is finished at a temp. between (Ar3 transformation point - 30) deg.C and (Ar3 transformation point + 50) deg.C. Then, accelerated cooling is performed down to 400-600 deg.C at 2-20 deg.C/sec cooling rate. By this method, Nb can be effec tively utilized, and a non heat-treated high tensile steel of >=60kgf/mm excellent in toughness at low temp. can be effectively produced.

4. 发明专利

JPH0327884A MANUFACTURE OF ALUMINUM CLAD STEEL PLATE 失效
公开(公告)号：JPH0327884A
公开(公告)日：1991-02-06
申请号：JP16328889
申请日：1989-06-26
申请人： KOBE STEEL LTD
发明人： TAKASHIMA NOBUTSUGU , TONE SHOJI , SUGA TOSHIAKI , MIYAWAKI ATSUSHI
IPC分类号： B23K20/04 , B32B15/01
摘要： PURPOSE:To improve the metallic joining strength of an aluminum plate of a clad material and a steel plate of a base material by providing the ruggedness of a specific shape on the surface of the steel plate of the base material, and also, forming film of thermal spray on the surface of the base material. CONSTITUTION:An aluminum clad steel plate whose clad materials is formed by aluminum or an aluminum alloy and base material is a steel plate is manufactured by a rolling joining method. In this case, the clad material is heated to a temperature of 400 deg.C - =10% in at least one pass. In such a way, a clad steel plate whose joining strength is high, and accordingly, whose shearing strength is also high can be obtained.

5. 发明专利

JPH0313524A PRODUCTION OF THICK HIGH-TOUGHNESS HIGH TENSILE STEEL PLATE HAVING EXCELLENT TOUGHNESS ON STEEL PLATE SURFACE AND IN CENTRAL PART OF THICKNESS 失效
公开(公告)号：JPH0313524A
公开(公告)日：1991-01-22
申请号：JP14736689
申请日：1989-06-10
申请人： KOBE STEEL LTD
发明人： TAKASHIMA NOBUTSUGU , SHIMIZU MASATO , ABE KENGO
IPC分类号： C21D8/02 , C22C38/00 , C22C38/14
摘要： PURPOSE:To produce the thick high-toughness high tensile steel plate having the excellent low-temp. toughness in the central part of the thickness and the surface part of the steel plate by subjecting a steel stock having a specific compsn. to a water cooling at a specific cooling rate between a rough rolling and finish rolling at the time of producing the thick steel plate by subjecting the above-mentioned steel stock to the hot rough rolling, finish rolling and cooling. CONSTITUTION:The slab of a low-carbon steel contg., by weight, 0.01 to 0.10% C, 0.10 to 0.50% Si, 0.5 to 2.0% Mn, =1 kind of =50mm thickness at >30% rolling reduction in the temp. range of (Ar3 to 50 deg.C) to (Ar3 to 10 deg.C) steel plate surface temp. to >=(Ar3 to 50 deg.C) steel plate surface temp. and is then cooled down to =1 times of the water cooling treatment at the cooling rate CR( deg.C/ sec) expressed by inequation between the rough rolling and the finish rolling.

6. 发明专利

JPH02205628A PRODUCTION OF ACCELERATED COOLING TYPE THICK STEEL PLATE WITH LOW YIELD RATIO 失效
公开(公告)号：JPH02205628A
公开(公告)日：1990-08-15
申请号：JP2616489
申请日：1989-02-04
申请人： KOBE STEEL LTD
发明人： TAKASHIMA NOBUTSUGU , SHIMIZU MASATO , IWAI KIYOSHI , SHIBATA MITSUAKI
IPC分类号： C21D8/02 , C22C38/00 , C22C38/14 , C22C38/50
摘要： PURPOSE:To produce an accelerated cooling type thick steel plate with low yield ratio by regulating the carbon equivalent of a steel with a specific composition, controlling cooling velocity according to the carbon equivalent, and controlling ferrite fraction at the time of producing a thick steel plate by hot-rolling a slab of the above steel. CONSTITUTION:A slab of a steel having a composition which contains, by weight, 0.05-0.20% C, 0.05-0.60% Si, 0.5-2.0% Mn, and 0.005-0.030% Ti or further contains one or >=2kinds among

7. 发明专利

JPH02190445A HIGH-MN NONMAGNETIC STEEL EXCELLENT IN SR EMBRITTLEMENT-RESISTING PROPERTY 失效
公开(公告)号：JPH02190445A
公开(公告)日：1990-07-26
申请号：JP1033289
申请日：1989-01-18
申请人： KOBE STEEL LTD
发明人： TAKASHIMA NOBUTSUGU , TONE SHOJI
IPC分类号： C22C38/00 , C22C38/12 , C22C38/58
摘要： PURPOSE:To manufacture a high-Mn nonmagnetic steel having superior magnetic properties even after stress relief annealing by preparing a steel having a composition which contains specific percentages of C, Si, Mn, P, S, Mo, and B and in which C and Mn satisfy a specific inequality. CONSTITUTION:A high-Mn nonmagnetic steel having a composition which consists of, by weight, 0.10.0.70% C, 0.10-1.50% Si, 10-30% Mn, =24% is satisfied is prepared. Since this steel causes no deterioration in basic characteristics even if subjected to stress relief annealing (SR) at about 600-700 deg.C after welding or cold rolling, the high-Mn nonmagnetic steel remarkably improved in SR embrittlement-resisting property and having superior mechanical properties can be obtained.

8. 发明专利

JPH02173207A PRODUCTION OF TI-CONTAINING HIGH TOUGHNESS AND HIGH TENSION STEEL PLATE 失效
公开(公告)号：JPH02173207A
公开(公告)日：1990-07-04
申请号：JP32732788
申请日：1988-12-25
申请人： KOBE STEEL LTD
发明人： TAKASHIMA NOBUTSUGU , SHIMOHATA TAKASHI , SHIAKU TOYOAKI
IPC分类号： C21D8/02 , C22C38/00 , C22C38/14
摘要： PURPOSE:To give high toughness at high temp. to a steel plate, to improve uniformity in quality of the steel plate and to reduce unevenness between steelmaking lots by regulating the steel slab temp. at the time of heating the steel slab containing specific content of Ti and controlling the hot-rolling condition. CONSTITUTION:The continuously cast steel slab containing 0.04-0.15% Ti, 0.02-0.15% C and 0.0010-0.0060% N is heated so that the temp. T ( deg.C) of the steel slab satisfies the conditions of the inequalities I and II. Further, the steel slabs are uniformly heated so that the temp. variety in the steel slab and the temp. difference at center part of the steel slab between the steel slabs, come to =30% rolling reduction ratio at >=900 deg.C, >=60% accumulated rolling reduction ratio at

9. 发明专利

JPH02163314A MANUFACTURE OF HIGH TENSILE STRENGTH STEEL FOR COLD WORKING HAVING LOW YIELD RATIO 失效
公开(公告)号：JPH02163314A
公开(公告)日：1990-06-22
申请号：JP31704088
申请日：1988-12-14
申请人： KOBE STEEL LTD
发明人： TAKIZAWA KENSABURO , KAJI HARUO , TAKASHIMA NOBUTSUGU , SHIMIZU MASATO
IPC分类号： C21D8/02 , C22C38/00 , C22C38/12 , C22C38/50
摘要： PURPOSE:To manufacture a high tensile strength steel having superior cold workability, toughness at low temp. and a low yield ratio by successively subjecting a low-carbon low-alloy steel billet having a specified compsn. to rough rolling at a specified temp., finish rolling under specified conditions and direct quenching. CONSTITUTION:A low-carbon low-alloy steel billet having a compsn. contg., by weight, 0.03-0.07% C, 0.10-0.60% Si, 1.20-2.50% Mn, 0.80-2.00% Cu, 0.30-3.50% Ni, 0.01-0.080% Nb and 0.01-0.080% Al or further contg. one or more among 0.10-1.50% Cr, 0.05-0.50% Mo, 0.010-0.10% V, 0.005-0.02% Ti and 0.0005-0.0050% Ca is rough-rolled at 950-1,150 deg.C and finish-rolled at a start temp. T within the temp. range of 900-700 deg.C and a total draft R satisfying R>=0.15T-75(%). This finish rolling is finished at the Ar3 transformation point of the steel or above and direct quenching is carried out.

10. 发明专利

JPH0293020A PRODUCTION OF HIGH-TENSILE STEEL PLATE WITH LOW YIELD RATIO EXCELLENT IN WELDABILITY 失效
公开(公告)号：JPH0293020A
公开(公告)日：1990-04-03
申请号：JP24325788
申请日：1988-09-28
申请人： KOBE STEEL LTD
发明人： TAKASHIMA NOBUTSUGU , SHIMOHATA TAKASHI , KOBAYASHI YOICHIRO
IPC分类号： C21D8/02 , C22C38/00 , C22C38/12 , C22C38/54
摘要： PURPOSE:To maintain high strength with low carbon equivalent and also to improve weldability, etc., by controlling the heating temp. and hot rolling temp. of a steel slab in which contents of C, Si, Mn, Nb, and Al are specified, respec tively, and further applying direct hardening and tempering to the above. CONSTITUTION:A steel having a composition consisting of, by weight, 0.02-0.2% C, 0.02-0.5% Si, 0.5-2% Mn, 0.005-0.03% Nb, 0.01-0.1% Al, and the balance Fe is refined. This steel is heated up to a temp. T( deg.C) defined by T=6770/(2.26-log[Nb%][C%]-273 deg.C. Subsequently, the above steel is hot-rolled at >=Ar3+1000 deg.C. Then, the resulting hot rolled steel plate is subjected to direct hardening from an (alpha+gamma) two phase region and further to tempering.

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