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1. 发明专利

JPH0489160A TUNDISH FOR CONTINUOUS CASTING 失效
公开(公告)号：JPH0489160A
公开(公告)日：1992-03-23
申请号：JP20221090
申请日：1990-07-30
申请人： NIPPON KOKAN KK
发明人： MURAKAMI HIROSHI , SUZUKI MIKIO , MIYAHARA SHINOBU
IPC分类号： B22D11/10 , B22D11/11 , B22D11/112 , B22D11/115 , B22D11/116 , B22D11/117 , B22D41/005 , B22D41/62 , H02K44/02 , H02N15/00
摘要： PURPOSE:To stably keep the temp. of a molten metal uniform by setting a plasma heating device between both nozzles of a ladle and a tundish and an electromagnetic molten steel stirring device near the heating device. CONSTITUTION:The molten steel 2 is poured in the tundish 10 from the ladle incorporating the molten steel 2 through the ladle nozzle 3 and further, poured into a mold through the tundish nozzle 4 to execute continuous casting. Then, the plasma heating device 5 for heating the molten steel 2 is set between the ladle nozzle 3 and the tundish nozzle 4. Further, the molten steel stirring device 11 for stirring the molten steel with electromagnetic force is set near the plasma heating device 5. An AC linear motor electromagnetic coil or an electric magnet is used to the molten steel stirring device. By this method, inclusion brought in the mold can be reduced.

2. 发明专利

JPH01289542A CASTING MOLD FOR CONTINUOUS CASTING OF STEEL 失效
公开(公告)号：JPH01289542A
公开(公告)日：1989-11-21
申请号：JP33686987
申请日：1987-12-29
申请人： NIPPON KOKAN KK
发明人： MURAKAMI HIROSHI , SUZUKI MIKIO , KITAGAWA TORU
IPC分类号： B22D11/04 , B22D11/059
摘要： PURPOSE:To prevent nonuniform solidification and to improve productivity by providing grating grooves having a specific shape and spacing on a casting mold surface near meniscus and packing different metals or ceramics into the grooves down to the depth of the prescribed conditions. CONSTITUTION:The grating-shaped grooves 2 having 0.5-1.0mm depth and 0.5-1.00mm width are provided to the casting mold surface near the meniscus of a molten steel in the casting mold and the spacing between the grooves is specified to a 5-10mm range. The different metals consisting of Ni and Cr or the ceramics such as BN, AlN and ZrO2 are packed at need into the grooves down to the depth at which the thermal resistance ratio (h) expressed by equation I attains >=1.5. Since the grooves 2 are disposed near the meniscus part, the formation of hexagonal rugged patterns on the immersion side of the solidified shell in the initial period of solidification and the formation of the ruggedness on the molten steel side is prevented from the initial period of solidification. The nonuniform solidification of the molten steel is thereby prevented and, therefore, the high-speed casting is enabled and the productivity is improved.

3. 发明专利

JPH01143742A MOLD FOR CONTINUOUS CASTING 失效
公开(公告)号：JPH01143742A
公开(公告)日：1989-06-06
申请号：JP29773787
申请日：1987-11-27
申请人： NIPPON KOKAN KK
发明人： OKIMOTO KAZUO , SUZUKI MIKIO , MURAKAMI HIROSHI
IPC分类号： B22D11/04 , B22D11/055
摘要： PURPOSE:To uniformize the solidified shell and to prevent the development of breakout by parallel arranging plural water cooling zone to longitudinal direction of a mold wall and setting cooling rate at the part of the mold wall corresponding to the each cooling zone, respectively. CONSTITUTION:The mold body having cylindrical mold wall 11 is formed and the water cooling zones 21, 22 are arranged at upper and lower parts with plural water boxes 20 at outer side of the mold wall 11. In the water cooling zones 21, 22, cooling water passages 23, 24 are arranged, and the zone 21 is set at above the meniscus part of molten metal and the zone 22 is set below the meniscus part. The water cooling zone 21 sets at slowly cooling condition to prevent rapid cooling and uneven thickness of the solidified shell. In the water cooling zone 22, the cooling condition to be possible to relatively rapid- cool is set to develop the solidified shell and prevent raising of molten metal temp. As the suitable water cooling condition is set at each water cooling zone and the mold wall 11 is cooled, the solidified shell is uniformized and the breakout caused by longitudinal crack is prevented.

4. 发明专利

JPH1029043A CONTINUOUS CASTING METHOD FOR STEEL, AND MOLD THEREFOR 失效
公开(公告)号：JPH1029043A
公开(公告)日：1998-02-03
申请号：JP18504896
申请日：1996-07-15
申请人： NIPPON KOKAN KK
发明人： SHIMIZU HIROSHI , MIYATA YASUTO , SUZUKI MAKOTO , NISHIMACHI RIYUUZOU , MURAKAMI HIROSHI
IPC分类号： B22D11/04 , B22D11/10 , B22D11/108
摘要： PROBLEM TO BE SOLVED: To prevent longitudinal cracks in the surface of a cast slab and a recess in the cast slab caused by non-uniform solidification of a solidified shell in the vicinity of the meniscus in a continuous casting mold. SOLUTION: A continuous casting method of steel is provided by using a mold made of copper plate in which lattice-shaped plates 2 made of dissimilar metal or alloy of lower thermal conductivity than that of copper is provided on a surface of at least a longer side copper plate 1 with the lattice interval (a) of 10∼40mm, the plating width (b) (mm) satisfies the inequality of 0.2a =0.5mm, and the arrangement of the lattice is inclined in relation to the drawing direction of the cast slab, and by using the mold powder to satisfy the inequality of η

5. 发明专利

JPH0220645A MOLD FOR CONTINUOUSLY CASTING STEEL 失效
公开(公告)号：JPH0220645A
公开(公告)日：1990-01-24
申请号：JP17048288
申请日：1988-07-08
申请人： NIPPON KOKAN KK
发明人： MURAKAMI HIROSHI , SUZUKI MIKIO , KITAGAWA TORU
IPC分类号： B22D11/04 , B22D11/059
摘要： PURPOSE:To prevent longitudinal crack of solidified shell at initial stage in kind of steel executing hypo-peritectic solidification having 0.10-0.15% carbon content by arranging the specific lattice-like grooves on mold surface positioning near meniscus of molten steel. CONSTITUTION:In the copper-made mold for continuous casting, on the mold surface positioning gear the meniscus of the molten steel in the mold, the lattice- like grooves having 0.5-1.0mm depth and 0.5-1.0mm width are arranged at 5-10mm interval between the grooves. By this method, cooling degrees at grooving part and non-grooving part fiffer and the initial solidification is a little delayed at the grooving part, which is weak cooling part. Therefore, the liquid phase is remained at every fixed intervals and absorbs strain at the time of shrinking, and bending of the solidified shell at the initial stage is restrained and the solidified shell is locally separated from the mold. Therefore, heat conduction is made uniform and the solidified shell thickness is made uniform. In this result, as the local thin part in the solidified shell layer is eliminated by developing the solidified shrinkage and transformation stress at the time of transforming delta gamma, the stress is not concentrated at one point.

6. 发明专利

JPH01170551A MOLD FOR CONTINUOUSLY CASTING STEEL 失效
公开(公告)号：JPH01170551A
公开(公告)日：1989-07-05
申请号：JP32820387
申请日：1987-12-24
申请人： NIPPON KOKAN KK
发明人： SUZUKI MIKIO , MURAKAMI HIROSHI , KITAGAWA TORU , OKIMOTO KAZUO , UCHIDA SHIGETAKA
IPC分类号： B22D11/04 , B22D11/055
摘要： PURPOSE:To restrain conduction of heat of molten steel during solidification, to form uniform solidified shell and to obtain a mold for continuously casting steel without developing any surface cracking by executing the strong and weak cooling at less than the specific size of interval near the meniscus of the molten steel in the mold. CONSTITUTION:At near the meniscus in the mold copper plate 21 as showing in the figure, for example, heat pipes 13 are embedded in the copper plate 21 in the range of 50-250mm at the interval of less than 30mm and cooling grooves 22 are fitted at the lower end thereof. Then, a cooling box 23 for cooling this copper plate 21 is arranged at back face of the copper plate 21. This cooling box 23 is divided into two steps and the upper step is used to cooling of the pipes 13 and the lower step is used to cooling of the cooling grooves 22. Then, the pipe 13 part and the groove 22 part are arranged at separated system. Further, cooling water rate is divided so as to become the same cooling as the whole mold to the pipe 13 part and the groove 22 part. By using the mold executing the strong and weak cooling in such way, for example, in the result of casting hypo-peritectic reaction series steel kind, the surface crack in the slab is almost eliminated (at less than 1/10) as compared with the conventional method, hot charge or hot direct rolling can be executed.

7. 发明专利

JPH1177267A METHOD FOR CONTINUOUSLY CASTING STEEL 失效
公开(公告)号：JPH1177267A
公开(公告)日：1999-03-23
申请号：JP24881597
申请日：1997-09-12
申请人： NIPPON KOKAN KK
发明人： SHIMIZU HIROSHI , MORI KENTARO , YAMAOKA YUICHI , MURAKAMI HIROSHI , NAKADA MASAYUKI
IPC分类号： B22D11/10 , B22D11/103 , B22D11/11 , B22D11/112 , B22D11/116 , B22D11/18
摘要： PROBLEM TO BE SOLVED: To prevent the entrapment of mold powder by controlling the fluid in the molten steel surface in a mold in continuous casting of a steel. SOLUTION: An immersion nozzle 6 having two or more holes of spouting holes 7, is used and the casting is executed in the range of satisfying the inequality Q/S ) of the immersion nozzle, the dipping depth D (mm) of the immersion nozzle and the molten steel pouring quantity Q (1/min) into the mold 1. When the variating quantity of the molten steel surface 10 in the mold becomes >=5 mm, one or more in the reduction of the molten steel pouring quantity Q, the impression of the static magnetic field into the molten steel in the mold and the increase of the dipping depth D of the immersion nozzle, is executed to control the variation of the molten steel surface in the mold to

8. 发明专利

JPH0890180A METHOD FOR PREVENTING BANDED STRUCTURE OF STAINLESS STEEL PLATE 失效
公开(公告)号：JPH0890180A
公开(公告)日：1996-04-09
申请号：JP24708494
申请日：1994-09-14
申请人： NIPPON KOKAN KK
发明人： YAMAGUCHI RYUJI , MURAKAMI HIROSHI
IPC分类号： B22D11/00 , B22D11/10 , B22D11/108 , B22D11/111 , B22D11/22
摘要： PURPOSE: To prevent the banded structure developed on the surface of a stainless steel plate after cold rolling - annealing by avoiding the developing cause itself and to clear the surface by using powder adjusted so that the viscosity and the solidified temp. of the powder used to a continuous caster satisfy the specific inequalities, respectively. CONSTITUTION: The banded structure developed on the surface of steel plate after cold rolling - annealing is caused by the unevenness of delta-ferrite quality and delta ferrite grain diameter due to ununiformity of cooling speed on the surface layer part of a cast slab cast in the continuous casting and in this result, the ununiformity to the growth of crystal grain on the surface layer part of steel plate is developed. In order to prevent this banded structure, the ununiformity of the cooling speed on the surface layer of cast slab is necessary to prevent. Then, the viscosity and the solidified temp. of the powder used in the continuous caster are adjusted so as to satisfy the inequality I and the inequality II. Wherein, η is the viscosity Poise at 1300 deg.C, T is solidified temp. deg.C of the powder and V is casting speed m/min.

9. 发明专利

JPH04253505A DIRECT ROLLING METHOD FOR CONTINUOUS CAST SLAB 失效
公开(公告)号：JPH04253505A
公开(公告)日：1992-09-09
申请号：JP3151191
申请日：1991-01-31
申请人： NIPPON KOKAN KK
发明人： SUZUKI MIKIO , MURAKAMI HIROSHI , MIYAHARA SHINOBU , KUBOTA ATSUSHI , MASAOKA TOSHIO
IPC分类号： B21B1/46 , B21B45/00 , B22D11/12
摘要： PURPOSE:To provide a direct rolling method for a continuous cast slab possible to reduce the generation of surface flow of the slab. CONSTITUTION:The steel slab drawn out of a continuous casting mold is cooled until the surface temperature comes to a range below point A1, then, cooling and heat insulation of the slab are adjusted, the surface of the slab is reheated up to more than 1000 deg.C by using sensible heat and latent heat of solidification held by the residual molten steel existing in the slab, then, the slab is heated uniformly in its width direction up to more than 1000 deg.C in an on-line heating zone installed at the rear stage of a continuous casting machine and then rolled. Then, in the same way, the slab is cooled until its surface temperature comes to >=point A1 and =2min, then rolled.

10. 发明专利

JPH026037A METHOD FOR CONTINUOUSLY CASTING STEEL 失效
公开(公告)号：JPH026037A
公开(公告)日：1990-01-10
申请号：JP15888388
申请日：1988-06-27
申请人： NIPPON KOKAN KK
发明人： MURAKAMI HIROSHI , SUZUKI MIKIO , KITAGAWA TORU
IPC分类号： B22D11/04 , B22D11/059
摘要： PURPOSE:To prevent uneven solidification in continuous casting for the specific steel by arranging notched parts having the specific size and arrangement at near meniscus of molten steel in a copper-made mold and specifying relation between casting velocity and oscillation cycle of the mold. CONSTITUTION:Grooves (the notched parts) 2 having 0.5-1.0mm depth and 0.3-1.0mm width are arranged on the surface of the copper-made mold 1 for continuous casting at near the meniscus of the molten steel in the mold. The grooves 2 are set at each 5-10mm interval as parallel with drawing direction of a cast slab. Further, the relation between the casting velocity (Vc) and the oscillation cycle of the mold (f) is made to satisfy the inequality I. Different kind of metal (Ni, Cr) or ceramic (BN, AlN, ZrO2) is filled up into the notched parts to the prescribed depth. By this method, the uneven solidification in the steel kind having hypo-peritectic solidification, such as 0.10-0.15% carbon content in the molten steel can be improved.

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