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111. 发明专利

JP2001254139A LOW CARBON STEEL CONTINUOUSLY CAST SLAB SMALL IN AUSTENITIC GRAIN AT THE TIME OF HEATING 失效
公开(公告)号：JP2001254139A
公开(公告)日：2001-09-18
申请号：JP2000068211
申请日：2000-03-13
申请人： NIPPON STEEL CORP
发明人： KOJIMA AKIHIKO , TERADA YOSHIO , KIYOSE AKITO , UEMORI RYUJI , YOSHIE ATSUHIKO
IPC分类号： C22C38/00 , C22C38/14 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To retain the average diameter of γgrains when being held at a temp. of 1,150 to 1,300 deg.C for 30 to 90 min to =0, the effective Ti content = Ti-2 ×the effective O content ...(2), and, in the case of the effective O content

112. 发明专利

JP2001207242A THICK-WALLED SOUR-RESISTING STEEL TUBE EXCELLENT IN TOUGHNESS AT LOW TEMPERATURE IN CIRCUMFERENTIAL WELD ZONE, AND PIPELINE 失效
公开(公告)号：JP2001207242A
公开(公告)日：2001-07-31
申请号：JP2000019308
申请日：2000-01-27
申请人： NIPPON STEEL CORP
发明人： TERADA YOSHIO , KOJIMA AKIHIKO
IPC分类号： B23K15/00 , B23K26/21 , B23K26/32 , B23K101/06 , B23K101/10 , C22C38/00 , C22C38/14 , C22C38/50 , B23K26/00
摘要： PROBLEM TO BE SOLVED: To provide a steel tube having sour resistance and excellent electron beam weldability. SOLUTION: A composite of MnS and oxides composed essentially of Ti, Al, and Ca is incorporated into the circumferential weld zone of a low C-low Mn-extra low S-Nb-Ti-low Al-Ca steel tube. The resultant high strength steel tube excellent in HIC resistance as well as in toughness in circumferential weld zone can greatly improve the safety of pipeline.

113. 发明专利

JP2001200313A METHOD FOR PRODUCING ELECTRIC RESISTANCE WELDED TUBE FOR COLD FORGING EXCELLENT IN WORKABILITY 失效
公开(公告)号：JP2001200313A
公开(公告)日：2001-07-24
申请号：JP2000008285
申请日：2000-01-17
申请人： NIPPON STEEL CORP
发明人： SAKAMOTO SHINYA , TERADA YOSHIO , OKAMOTO JUNICHI , MISAWA MASAHIRO
IPC分类号： B21C37/08 , B21J1/06 , C21D9/08 , C22C38/00 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide an electric resistance welded tube for automobiles and mechanical structures requiring workability and to provide a method for producing the same. SOLUTION: In the method for producing an electric resistance welded tube having a composition containing, by mass%, specified amounts of C, Si, Mn, S, P, Al and N, moreover containing, at need, one or more kinds among Cr, Ni, Cu, Mo, V, Ti, Nb, B and Ca, and the balance Fe with inevitable impurities, the electric resistance welded tube is reheated at the AC3 point to (the AC3 point +50 deg.C), is held at the same temperature for 3 to 20 min, is thereafter cooled to a temperature of (the AC1 point -100 deg.C) to less than the AC1 point, is held to the same temperature for 5 to 180 min and is thereafter air-cooled.

114. 发明专利

JP2000256779A ULTRAHIGH STRENGTH STEEL TUBE EXCELLENT IN TOUGHNESS AT LOW TEMPERATURE, AND ITS MANUFACTURE 失效
公开(公告)号：JP2000256779A
公开(公告)日：2000-09-19
申请号：JP6318599
申请日：1999-03-10
申请人： NIPPON STEEL CORP
发明人： HARA TAKUYA , ASAHI HITOSHI , TAMEHIRO HIROSHI , TERADA YOSHIO
IPC分类号： B23K9/18 , B23K101/06 , B23K103/04 , C21D9/08 , C21D9/50 , C22C38/00 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To improve toughness at low temperature in a weld zone as well as in a base material by providing a base material and a weld metal zone both having respectively specified compositions, regulating the amount of Ni in the weld metal zone so that it is higher than that in the base material by specific amount, and subjecting a seam weld zone containing the weld metal zone and the heat-affected zone of base material to reheating treatment to a specific temperature. SOLUTION: Other than C, Si, Mn, P, and S, the base material contains, by weight, 0.1-1% Ni, 0.15-0.6% Mo, 0.01% Nb, 0.005-0.03% Ti, =1% than the amount of Ni in the base material. The seam weld zone is subjected to reheating treatment to A1+100 to 1000 deg.C.

115. 发明专利

JP2000109949A ELECTRIC RESISTANCE WELDED TUBE EXCELLENT IN WORKABILITY AND ITS PRODUCTION 失效
公开(公告)号：JP2000109949A
公开(公告)日：2000-04-18
申请号：JP28390098
申请日：1998-10-06
申请人： NIPPON STEEL CORP
发明人： SAKAMOTO SHINYA , TERADA YOSHIO , SUMIMOTO DAIGO , SAKUMA KOJI
IPC分类号： B21C37/08 , C21D8/10 , C22C38/00 , C22C38/06
摘要： PROBLEM TO BE SOLVED: To produce an electric resistance welded tube excellent in workability and suitable for automotives and machine structures and to provide a method for producing it. SOLUTION: This electric resistance welded tube excellent in workability is the one having a compsn. contg., by weight, 0.05 to 0.18% C, 0.5 to 1.0% Si, 0.5 to 1.5% Mn, =50 deg.C/s, the rapid cooling is finished in the range of =(T-70) deg.C, after that, through air cooling, it is coiled at the coiling temp. of 300 to 500 deg.C and is subjected to electric resistance welding in a welding atmosphere of inert gas with

116. 发明专利

JPH11302776A HIGH STRENGTH STEEL SHEET EXCELLENT IN SOUR RESISTANCE AND ITS PRODUCTION 失效
公开(公告)号：JPH11302776A
公开(公告)日：1999-11-02
申请号：JP14469298
申请日：1998-05-26
申请人： NIPPON STEEL CORP
发明人： TERADA YOSHIO , SAWAI TAKASHI , KOJIMA AKIHIKO
IPC分类号： C21D8/02 , C22C38/00 , C22C38/14 , C22C38/50
摘要： PROBLEM TO BE SOLVED: To obtain a high strength steel sheet having excellent sour resistance and HAZ toughness at a low cost by subjecting a steel based on a low C-low Mn-Nb-Ti material with strictly controlled amts. of S, Mg, Ca and O to control rolling, then rapidly cooling the rolled sheet to a specified temp. and then slowly cooling. SOLUTION: A steel sheet having the compsn. described below is heated at 1,050 to 1,250 deg.C, rolled at =60% total rolling reduction and 750 to 900 deg.C finish temp., immediately cooled in water to 350 to 600 deg.C at 3 to 40 deg.C/sec cooling rate, and then slowly cooled. The steel consists of, by weight, 0.002 to 0.08% C;

117. 发明专利

JPH11123448A BUTT WELDING BUTT, PART FOREIGN MATTER REDUCING METHOD IN BUTT WELDED STEEL TUBE PRODUCTION PROCESS 失效
公开(公告)号：JPH11123448A
公开(公告)日：1999-05-11
申请号：JP28592397
申请日：1997-10-20
申请人： NIPPON STEEL CORP
发明人： SAKAMOTO SHINYA , TERADA YOSHIO , SUMIMOTO DAIGO
IPC分类号： B21C37/06 , B23K20/00 , B23K20/14
摘要： PROBLEM TO BE SOLVED: To provide a butt welding butt part foreign matter reducing method in a butt welded steel tube production process. SOLUTION: In a production of a butt welded steel tube so that after a skelp reheated to 1300-1350 deg.C in a heating furnace is subjected to continuous hot forming to a tubular shape and butt welding is conducted with blowing oxygen to both edge parts of a tubular skelp, a welding horn is arranged at a middle of forming rolls 3, 4 and a butt welding roll 6, a nozzle 7 directed in a direction opposite to an advancing direction of the tubular skelp 1 and a nozzle 8 directed in the same direction thereto are arranged, air/oxygen are blown from the nozzle 8 directed opposite to the advancing direction and inert gas is blown from the nozzle 7 directed in the same direction to the advancing direction. By this method, a scale is completely removed from a butt welded face of an edge part of the tubular skelp immediately before butt welding, a problem of scale inclusion of a butt welding part is eliminated, a production of a high strength butt welded part and a high quality butt welded steel tube is made possible.

118. 发明专利

JPH10306348A ULTRAHIGH STRENGTH STEEL PIPE EXCELLENT IN LOW TEMPERATURE CRACKING RESISTANCE 失效
公开(公告)号：JPH10306348A
公开(公告)日：1998-11-17
申请号：JP11595097
申请日：1997-05-06
申请人： NIPPON STEEL CORP
发明人： TERADA YOSHIO , TAMEHIRO HIROSHI , ASAHI HITOSHI , HARA TAKUYA , KOYAMA KUNIO
IPC分类号： B21C37/08 , C21D8/10 , C22C38/00 , C22C38/14 , C22C38/50
摘要： PROBLEM TO BE SOLVED: To obtain an ultrahigh strength steel pipe excellent in low temp. toughness by using a low C-high Mn series steel as a base metal, allowing it to have a low C-high O series weld metal zone and limiting the characteristic value by contained components therein to a specified range. SOLUTION: This ultrahigh strength steel pipe excellent in low temp. cracking resistance is the one using a low C-high Mn steel contg., by weight, 0.05 to 0.10% C, 1.8 to 2.5% Mn and specified small amounts of Si, P, S, Ni, Mo, Nb, Ti, Al, N and O and furthermore contg., at need, one or >= two kinds among Cu, Cr, V, B and Ca as a base metal and having a weld metal zone having a compsn. contg. 0.03 to 0.08% C, 0.035 to 0.050% 0 and specified small amounts of Si, Mn, P, S, Ni, Cr, Mo, Nb, Ti, Al and N, furthermore contg., at need, small amounts of Cu, V, Ca and B, and in which the value of P prescribed by P=C+0.11Si+0.03Mn+0.02Ni+0.04Cr+0.07Mo+1.46Nb is regulated to the range of 0.25 to 0.40.

119. 发明专利

JPH10258364A STEEL TUBE WELDING METHOD GIVING LESS WELDING DEFECT 失效
公开(公告)号：JPH10258364A
公开(公告)日：1998-09-29
申请号：JP6151797
申请日：1997-03-14
申请人： NIPPON STEEL CORP
发明人： TERADA YOSHIO , OGATA YOSHINORI
IPC分类号： B23K9/18 , B21C37/12 , B23K9/08
摘要： PROBLEM TO BE SOLVED: To attain high productivity and improved welding quality by arranging an energizing coil that encloses each electrode of multi-electrode submerged welding, imparting to the coil an alternating current in a specific hertz range, welding with a magnetic flux density set in a specific gauss range at the tip end of a welding wire, and thereby improving the welding speed of seam welding of UOE and spiral steel tubes. SOLUTION: An alternating current of 5-15 Hz is flowed from the power source 11 of an alternating magnetic field to the coil 3 wound between the steel-made inner and outer skins, and generates a magnetic field having a 50-500 gauss of a magnetic flux density at the tip end of a welding wire. Since the magnetic field generated by winding an enamel copper wire in the circumferential direction of the first to fourth electrode 12-15, then a magnetic field 25 is obtained in the axial direction against a welding electrode on the steel-made inner skin 2 side of a magnetic stirring coil. Meantime, a welding arc 22-25 for the first to fourth electrode is generated while a proximity to a weld zone is covered with a flux 21 for submerged arc welding between the welding wire and the base material from each center through the welding electrode 12-15 from the power source.

120. 发明专利

JPH09296218A PRODUCTION OF HIGH STRENGTH BENT PIPE EXCELLENT IN LOW TEMPERATURE TOUGHNESS IN WELD ZONE 失效
公开(公告)号：JPH09296218A
公开(公告)日：1997-11-18
申请号：JP11164996
申请日：1996-05-02
申请人： NIPPON STEEL CORP
发明人： TERADA YOSHIO , OGATA YOSHINORI , TAKAMOTO TERUHISA
IPC分类号： B21D7/16 , C21D8/10 , C21D9/08 , C22C38/00 , C22C38/14 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To improve the strength and low temp. toughness of a bent pipe by prescribing the elemental contents in the weld metal zone. SOLUTION: This steel pipe has weld metal components contg. low C-high Mn-Nb-trace Ti-high O, and in which the balance among the contents of Al, N, O and Ti are taken into consideration to optimize each amt. to be added. Namely, the simultaneous addition of Mn and O is particularly extremely effective for the suppression of coarse intergranular ferrite and for the increase of low temp. hardness in the weld metal zone in the longitudinal direction, but, for showing this effect, it is required that the content of Mn is regulated to >1.6 to 2.2% and O to 0.035 to 0.05%. Furthermore, in the case of the increase in the O content, its low temp. toughness deteriorates, but, by optimizing each component so as to regulate the value of P to -0.010 to 0.010% in the formula expressed by P=(1.5(O-0.89Al)+3.4N)-Ti, its low temp. toughness improves.

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