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21. 发明专利

JP2000178690A PEARLITIC RAIL EXCELLENT IN RESISTANCE TO WEAR AND INTERNAL FATIGUE DAMAGE, AND ITS MANUFACTURE 失效
公开(公告)号：JP2000178690A
公开(公告)日：2000-06-27
申请号：JP7451999
申请日：1999-03-18
申请人： NIPPON STEEL CORP
发明人： UEDA MASAHARU , UCHINO KOICHI
IPC分类号： E01B5/02 , C21D9/04 , C22C38/00 , C22C38/14 , C22C38/32
摘要： PROBLEM TO BE SOLVED: To provide a pearlitic rail capable of improving the wear resistance of a high-load railroad rail and capable of stably improving its resistance to internal fatigue damage, and its manufacturing method. SOLUTION: The pearlitic rail, excellent in resistance to wear and internal fatigue damage, has a composition consisting of, by weight, >0.85-1.20% C, 0.10-1.00% Si, 0.10-1.50% Mn, 0.0001-0.0040% B, 0.0050-0.0300% Ti, and the balance Fe with inevitable impurities and further containing, if necessary, one or >=2 elements among Cr, Mo, V, Nb, and Co. The structure of this rail, in the region ranging from railhead surface and railhead corner surface to a position at a depth of at least 20 mm from the surface, has pearlitic structure, and the hardness of the pearlitic structure in the above region is >=Hv 370 and difference in the hardness is

22. 发明专利

JP2000144325A BAINITIC ALUMINUM KILLED STEEL RAIL EXCELLENT IN GAS PRESSURE WELDABILITY 失效
公开(公告)号：JP2000144325A
公开(公告)日：2000-05-26
申请号：JP31309498
申请日：1998-11-04
申请人： NIPPON STEEL CORP
发明人： UCHINO KOICHI , KARIMINE KENICHI
IPC分类号： E01B5/02 , C22C38/00 , C22C38/18 , C22C38/54
摘要： PROBLEM TO BE SOLVED: To produce a sound gas pressure welded joint in which defects caused by the formation of low m.p. multiple oxide (mullite) on the pressure welding boundary at the time of subjecting the rail to pressure welding are prevented. SOLUTION: This rail for an aluminum killed steel rail has a compsn. contg., by weight, 0.15 to 0.45% C, 0.10 to 0.50% Si, 0.30 to 1.20% Mn, 0.20 to 3.00% Cr, 0.005 to 0.020% Mg and 0.010 to 0.040% Al, moreover contg. one or >=two kinds among 0.05 to 1.00% Mo, 0.05 to 1.00% Cu, 0.05 to 1.00% Ni, 0.005 to 0.05% Nb, 0.01 to 0.20% V, 0.005 to 0.050% Ti and 0.0001 to 0.0050% B, and the balance iron with inevitable impurities and is free from the generation of cracking caused by the formation of low m.p. oxide on the pressure welding boundary at the time of gas pressure welding.

23. 发明专利

JP2000144324A BAINITIC STEEL RAIL EXCELLENT IN GAS PRESSURE WELDABILITY 失效
公开(公告)号：JP2000144324A
公开(公告)日：2000-05-26
申请号：JP31309398
申请日：1998-11-04
申请人： NIPPON STEEL CORP
发明人： UCHINO KOICHI , UEDA MASAHARU
IPC分类号： E01B5/02 , B23K20/00 , B23K101/26 , B23K103/02 , C22C38/00 , C22C38/18 , C22C38/54
摘要： PROBLEM TO BE SOLVED: To produce a rail in which defects caused by the formation of low m.p. multiple oxide (mullite) on the pressure welding boundary at the time of subjecting the rail to gas pressure welding are prevented and having a sound gas pressure welded joint. SOLUTION: This bainitic steel rail has a compsn. contg., by weight, 0.15 to 0.45% C, 0.10 to 0.50% Si, 0.30 to 1.20% Mn, 0.20 to 3.00% Cr and 0.0005 to 0.0050% Mg and moreover contg., at need, one or >=two kinds among 0.05 to 1.00% Mo, 0.05 to 1.00% Cu, 0.05 to 1.00% Ni, 0.005 to 0.05% Nb, 0.01 to 0.20% V, 0.005 to 0.050% Ti and 0.0001 to 0.0050% B, and the balance iron with inevitable impurities.

24. 发明专利

JP2000054076A BAINITIE-BASE RAIL WITH LOW ELECTRIC RESISTANCE, EXCELLENT IN WELDED JOINT CHARACTERISTIC AND ROLLING FATIGUE DAMAGE RESISTANCE 失效
公开(公告)号：JP2000054076A
公开(公告)日：2000-02-22
申请号：JP21943598
申请日：1998-08-03
申请人： NIPPON STEEL CORP
发明人： UEDA MASAHARU , UCHINO KOICHI
IPC分类号： C22C38/00 , C22C38/38 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To combine welded joint characteristic, rolling fatigue damage resistance, and electric conductivity, all required of a rapid transit section, by specifying respective contents of C, Si, Mn, Cr, Mo, V, Nb, P and S in a rail steel to control electric resistance value and forming the structure of railhead into bainitic structure. SOLUTION: A rail steel is provided with a composition consisting of, by weight, 0.15-0.45% C, 0.10-0.50% Si, >0.50-1.80% Mn, 0.20-1.80% Cr, 0.01-0.60% Mo, 0.01-0.30% V, >0.01-0.05% Nb, =Hv 240 hardness. If necessary, 0.05-0.50%, by weight, Cu, 0.05-1.00% Ni, 0.005-0.050% Ti, and 0.0001-0.0040% B are incorporated into the above steel composition.

25. 发明专利

JPH11350075A PEARLITIC RAIL EXCELLENT IN GAS PRESSURE WELDABILITY 失效
公开(公告)号：JPH11350075A
公开(公告)日：1999-12-21
申请号：JP30262398
申请日：1998-10-23
申请人： NIPPON STEEL CORP
发明人： UCHINO KOICHI , UEDA MASAHARU
IPC分类号： E01B5/02 , B23K20/00 , C22C38/00 , C22C38/04 , C22C38/54
摘要： PROBLEM TO BE SOLVED: To prevent the occurrence of defects caused by the formation of a low-melting compound oxide (mullite) formed in the pressure weld interface at the time of gas pressure welding of a pearlitic rail and to obtain a sound gas pressure welded joint. SOLUTION: This pearlitic rail has a composition consisting of, by weight, 0.60-1.20% C, 0.10 0.50% Si, 0.30-1.20% Mn, 0.0060-0.02O0% N, and the balance iron with inevitable impurities or further containing one or >=2 kinds among 0.05-2.00% Cr, 0.01-0.20% Mo, 0.05-1.00% Cu, 0.05-1.00% Ni, 0.005 0.05% Nb, 0.01-0.20% V, 0.1-2.0% Co, 0.005-0.05% Ti, and 0.0001-0.0050% B.

26. 发明专利

JPH11152520A PRODUCTION OF HIGH STRENGTH BAINITE RAIL EXCELLENT IN SURFACE DAMAGE RESISTANCE AND WEAR RESISTANCE 失效
公开(公告)号：JPH11152520A
公开(公告)日：1999-06-08
申请号：JP31999997
申请日：1997-11-20
申请人： NIPPON STEEL CORP
发明人： UEDA MASAHARU , UCHINO KOICHI
IPC分类号： B21B3/00 , B21B1/08 , B21B1/085 , B21B45/02 , C21D9/04 , C22C38/00 , C22C38/38 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a high strength rail excellent in surface damage resistance and wear resistance, both required of a high-load railroad rail. SOLUTION: A steel, which has a composition consisting of, by weight, 0.15-0.45% C, 0.10-2.00% Si, 0.20-3.00% Mn, 0.20-3.00% Cr, and the balance iron with inevitable impurities and further containing, if necessary, one or >=2 elements among Mo, Ci, Ni, Ti, V, Nb, and B, is hot-rolled. A railhead of a steel rail having intense heat after hot rolling or a railhead of a steel rail reheated and having intense heat is subjected to accelerated cooling from the austenite region temp. at (1 to 30) deg.C/sec cooling rate. Accelerated cooling is stopped at the point of time when the steel railhead temp. becomes 400-300 deg.C. Successively, holding is performed at 400-300 deg.C for 1-30 min.

27. 发明专利

JPH1177339A THERMIT WELDING METHOD FOR RAIL 失效
公开(公告)号：JPH1177339A
公开(公告)日：1999-03-23
申请号：JP23739097
申请日：1997-09-02
申请人： NIPPON STEEL CORP
发明人： UCHINO KOICHI
IPC分类号： B22D27/18 , B22D27/20 , B23K23/00 , B23K101/26 , C21C7/06
摘要： PROBLEM TO BE SOLVED: To improve the toughness of weld metal for improving the reliability of a thermit welded joint in a railway in a cold district. SOLUTION: This welding method is the one that, at the time of pouring molten metal formed by thermit reaction into a mold and leaving it standing, deoxidizing elements are inserted into the pouring flow of the molten metal and/or, simultaneously with the start of its leaving to stand, deoxidizing elements are inserted into the molten metal to allow secondary deoxidation to occur. In this way, fine oxide particles produced by the secondary deoxidation are dispersed into the weld metal to refine the cast structure, and furthermore, these fine particles are made the nuclei of transformation and refine the final structure to improve the toughness of the weld metal.

28. 发明专利

JPH10280098A HIGH TOUGHNESS RAIL EXCELLENT IN WEAR RESISTANCE 失效
公开(公告)号：JPH10280098A
公开(公告)日：1998-10-20
申请号：JP8982297
申请日：1997-04-08
申请人： NIPPON STEEL CORP
发明人： UEDA MASAHARU , UCHINO KOICHI
IPC分类号： E01B5/02 , C22C38/00 , C22C38/38 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To obtain a high strength rail of two layer structure, excellent in wear resistance and toughness, by providing respective surface parts of a railhead corner and a railhead with a specific composition containing C, Si, Mn, and iron and a pearlitic structure of specific hardness and also providing the other part with a specific composition containing C, Si, Mn, Cr, and iron and a bainitic structure. SOLUTION: In a rail-axisl cross section consisting of a railhead (a), a railhead corner (b), a piller (c), and a rail foot (d), the part, in the region from the surface of the railhead (a) and the railhead corner (b) to a position at a depth of at least 20 mm from the surface, is constituted of a material 1 of >=320 Hv hardness, having a metallic structure composed of pearlitic structure. This material has a composition consisting of, by weight, >0.85-1.20% C, 0.10-1.00% Si, 0.10-1.50% Mn, and the balance iron with inevitanle impurities. Further, a material 2, having a metallic structure composed of bainitic structure, is a material having a composition consisting of 0.05-0.45% C, 0.15-2.00% Si, 0.50-3.00% Mn, 0.50-3.00% Cr, and the balance iron with inevitable impurities.

29. 发明专利

JPH09241747A PRODUCTION OF RAIL HAVING HIGH STRENGTH AT LARGE DEPTH 失效
公开(公告)号：JPH09241747A
公开(公告)日：1997-09-16
申请号：JP5353596
申请日：1996-03-11
申请人： NIPPON STEEL CORP
发明人： HIRAGAMI DAISUKE , UCHINO KOICHI , KUROKI TOSHIYA , TANO YASUNORI
IPC分类号： C21D8/00 , C21D9/04 , C22C38/00
摘要： PROBLEM TO BE SOLVED: To obtain a rail, in which a railhead is hardened to a large depth and wear resistance is improved, by hot-rolling a carbon steel or low alloy steel of specific C content into a rail shape and subjecting this rail to heating under specific conditions and to controlled cooling. SOLUTION: After the completion of hot rolling of a carbon steel or low alloy steel of 0.60-0.85% C content into a rail shape or reheating up to a temp. not lower than the Ac1 point, the surface of a railhead is cooled from a temp. not lower than the Ar1 point at (1 to 10) deg.C/sec cooling rate until the pearlitic transformation is started in the region 11 between the surface of the vertex and side part of the railhead and a position at a depth of =20mm from the surface, or, rapid cooling after the pearlitic transformation in surface layer part is finished is stopped at about 400-600 deg.C, and the rail is held at this temp. until the pearlitic transformation is finished. By this method, the difference between the hardness at the railhead vertex and the hardness at a position at a depth of 20mm from the railhead surface can be regulated to

30. 发明专利

JPH0957301A MANUFACTURE OF HIGH-DEPTH/HIGH-HARDNESS RAIL 失效
公开(公告)号：JPH0957301A
公开(公告)日：1997-03-04
申请号：JP21153195
申请日：1995-08-21
申请人： NIPPON STEEL CORP
发明人： KUROKI TOSHIYA , UCHINO KOICHI , HIRAGAMI DAISUKE
IPC分类号： B21B3/00 , B21B1/08 , B21B1/085 , C21D8/00 , C21D9/04
摘要： PROBLEM TO BE SOLVED: To manufacture a high-strength rail which is suitable to suppress the damage by internal fatigue by utilizing cooling buffer action of a surface layer which is generated by executing γ-granulating work on the head surface at the time of rolling rails and applying stable rapid cooling to the rail and controlling hardness distribution in the vicinity of the peak hardness in the inside after cooling. SOLUTION: In the rolling of a bloom for rails, finish rolling stage is divided into two stages, after the first-half finish rolling, time between passes of >=10sec is imparted. One pass or plural passes of the second-half finish rolling is executed at 800-950 deg.C at the draft of =6 deg.C/sec is started after 0.1-10sec, restaining or cooling is executed at 0-3 deg.C/sec for 1-40sec when the surface temp. becomes the range of 450-650 deg.C and accelerating cooling is again executed at the cooling rate of >=1 deg.C/sec down to the surface temp. of 400 deg.C. This method is not a high-cost method such as salt bath and the hardness distribution in the vicinity of the peak hardness in the head part is freely set without producing different structure such as martensite.

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