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1. 发明专利

JPH08257695A CONTINUOUS CASTING MOLD FOR STEEL AND CONTINUOUS CASTING METHOD 失效
公开(公告)号：JPH08257695A
公开(公告)日：1996-10-08
申请号：JP14694195
申请日：1995-05-23
申请人： NIPPON STEEL CORP
发明人： MISUMI HIDEYUKI , SHIRAGAMI TAKAYUKI , OCHI KIYOSHI , KOMORI TOSHIYA , OKUHARA KEISUKE
IPC分类号： B22D11/16 , B22D11/04
摘要： PURPOSE: To obtain a suitable condition in a mold structure and an operation condition, to improve the uniformity of a solidification shell at the position of operational variation, particularly at the initial stage of casting and the positional change of molten metal surface level, etc., and to restrain the development of the surface defect on a cast slab containing longitudinal crack by forming grooves on the mold for continuously casting a steel under a specific condition. CONSTITUTION: At the time of forming longitudinal grooves 2 on the surface of the mold 1 for continuous casting, the longitudinal grooves 2 having 0.1-0.3mm depth and 1.0-3.0mm width at the center part of the width in the range of >=1/2 to the casting width is formed at the position in the range from the upper part of at least >=20mm above a meniscus position 3 to 70mm below the meniscus 3 in the condition satisfying the equation. In the equation I, (w) is the width of the groove (mm) and (l) is the interval of the grooves (mm). Therefore, at the time of producing the cast slab by continuously casting i.e., a middle carbon steel containing 0.1-0.18% carbon content, since the longitudinal crack developed on the surface of the cast slab is surely restrained and the good quality cast slab can be produced, the high speed casting and the operation without exstra care can be obtd.

2. 发明专利

JPS57203712A REFINING METHOD FOR MOLTEN IRON 失效
公开(公告)号：JPS57203712A
公开(公告)日：1982-12-14
申请号：JP8933281
申请日：1981-06-10
申请人： NIPPON STEEL CORP
发明人： NISHIMURA MITSUHIKO , SAKURADA MORIKATSU , OCHI KIYOSHI
IPC分类号： C21C5/34 , C21C5/32 , C21C5/35
摘要： PURPOSE:To shorten the time required for molten iron refining and to increase the useful life of an immersed lance, by blowing liquid CO2 into a molten iron from blowing ports provided to the vicinity of the tip and the side wall of the immersed lance, and top-blowing gaseous oxygen from a multilance. CONSTITUTION:A molten iron 17 is agitated by blowing liquid CO2 from a lance 1 immersed into the molten iron 17 in a reaction vessel 16. At the same time, gaseous oxygen is top-blown by a multilance 15. At this time, the liquid CO2 is blown off from blowing ports 3, 4 and 5 provided to the tip of the lance 1 and from ports 6, 7, 8, 9, 10 and 11 provided to the side wall of said lance to agitate the molten iron 17 powerfully so as to perform decarbonization in a short time. Further, at the same time, the useful life of the lance 1 is prolonged by cooling effect due to the phase change of liquid CO2 to the gas phase.

3. 发明专利

JPS61204308A STEEL MAKING METHOD 失效
公开(公告)号：JPS61204308A
公开(公告)日：1986-09-10
申请号：JP4417085
申请日：1985-03-06
申请人： NIPPON STEEL CORP
发明人： KYOJIMA YOSHIYUKI , BABA KENICHI , NISHIMURA MITSUHIKO , OCHI KIYOSHI
IPC分类号： C21C5/30 , C21C5/32 , C21C5/34 , C21C5/35
摘要： PURPOSE:To improve a secondary combustion rate, to increase the using ratio of an inexpensive cold charge such as steel scrap and to reduce the cost of steel making by estimating exactly the secondary combustion rate in the stage of refining a molten iron subjected to preliminary refining such as desiliconization in an oxygen top blowing converter. CONSTITUTION:An oxygen jet is blown from a lance 11 having main holes 2 and auxiliary holes 3 for ejecting oxygen toward the surface of the molten iron 7 in the converter 1, by which the molten steel is oxidation-carburized and refined to steel. The CO-contg. gas generated by the decarburization reaction is included into free injection regions 16, 17 of the oxygen jet and is subjected to secondary combustion. The temp. of the molten steel 7 is increased by the generated heat, by which the using rate of the inexpensive cold charge scrap is increased and the cost of steel making is reduced. The secondary combustion is effectively utilized while the secondary combusion rate beta expressed by equation (II) is correctly estimated by using K to indicate the speed of the oxygen feed jet steel making is thus executed.

4. 发明专利

JPS58224003A Hot rolling method of continuous casting ingot 失效
标题翻译：连续铸造的热轧方法
公开(公告)号：JPS58224003A
公开(公告)日：1983-12-26
申请号：JP10896782
申请日：1982-06-24
申请人： Nippon Steel Corp
发明人： OGAWA HIROYUKI , OOTA KUNITERU , KOGA SUMIAKI , OCHI KIYOSHI
IPC分类号： B21B1/00 , B21B1/46
CPC分类号： B21B1/463
摘要： PURPOSE:To perform direct rolling which suppresses the generation of hot cracking by controlling adequately the cooling speed of an ingot in the stage of continuous casting as well as the temp. for starting rolling in the stage of direct rolling and the time when said temp. is attained. CONSTITUTION:An ingot for a thick plate or the like produced by continuous casting is subjected, after the casting, to cooling at the average cooling rate Vc ( deg.C/min) from 1,500 deg.C near the surface of the ingot up to 1,300 deg.C satisfying the conditions expressed by a functional equation I with a constant K (where, x: content of C, y: content of O). The ingot is further subjected to hot rolling for the lapse of time tmin since solidification until the rolling is started and at the surface temp. of the ingot in the stage of starting rolling satisfying the conditions of the relation II. Since the rolling free from hot cracking is accomplished with the effective utilization of the heat after the casting by the above-mentioned control for temp. conditions, the cost of energy is reduced.
摘要翻译：目的：进行直接轧制，通过充分控制连续铸造阶段的锭的冷却速度以及温度来抑制热裂纹的产生。在直接滚动的阶段开始滚动和所述温度的时间。达到了构成：通过连续铸造制造的用于厚板等的铸锭在铸造之后以平均冷却速率Vc（℃/ min）从锭的表面附近的1,500℃冷却至 1300℃，满足由常数K（其中，x：C，y：O含量）的函数式I表示的条件。从固化直到轧制开始并在表面温度下，该锭进一步经受热轧经过时间tmin。的锭子在开始轧制阶段满足关系II的条件。由于通过上述温度控制可以有效利用铸造后的热量来实现无热裂纹的轧制。条件下，能源成本降低。

5. 发明专利

JPH08309404A METHOD FOR PREVENTING SURFACE CRACK AT THE TIME OF HOT WIDTH DRAWING DOWN ROLLING OF CONTINUOUSLY CAST SLAB 失效
公开(公告)号：JPH08309404A
公开(公告)日：1996-11-26
申请号：JP13883895
申请日：1995-05-15
申请人： NIPPON STEEL CORP
发明人： MISUMI HIDEYUKI , OCHI KIYOSHI , SAITO SHUNTARO , KOMORI TOSHIYA
IPC分类号： B22D11/00 , B21B1/02 , B21B1/46 , B22D11/12 , B22D11/22 , C21D8/02 , C21D9/00 , C22C38/00 , C22C38/14
摘要： PURPOSE: To suppress a surface crack defect occurring at the time of a width adjustment by specifying respectively the temperature range and the frequency of cooling and recovery of heat, further edging drafts of the first, second and succeeding runs after a steel containing one kind or two kinds or over of a prescribed trace metal and trace nitrogen of a prescribed quantity or over is continuously cast. CONSTITUTION: An aluminum killed steel or an aluminum silicon killed steel with N>=20ppm, containing either one kind or two kinds or over of 0.020 to 0.100% Al, 0.005 to 0.100% Nb, 0.005 to 0.150% V, and 0.005 to 0.100% Ti, is cast to a slab by a curvature type continuous casting machine. A hot edging rolling is performed to this slab 6 without cooling it after repeating two times or over of cooling and recovery of heat, by which a temperature within 10mm from the surface of the slab is cooled to Ar3 -100 deg.C or below and is raised to 1000 deg.C or over and 1250 deg.C or below from and after a final bending straightening by the curvature type continuous casting machine. At that time, a first edging draft is set to 5% or below and the second and succeeding drafts are set to 5% or over.

6. 发明专利

JPH03122211A DEVICE FOR DISPERSLY-CHARGING ADDING MATERIAL INTO MOLTEN METAL VESSEL 失效
公开(公告)号：JPH03122211A
公开(公告)日：1991-05-24
申请号：JP26150889
申请日：1989-10-06
申请人： NIPPON STEEL CORP
发明人： EJIRI MITSURU , YONEZAWA KIMITOSHI , OYABU KENJI , ENDO KOICHI , OCHI KIYOSHI
IPC分类号： B65G11/12 , B22D1/00 , C21C7/04 , C22B9/10
摘要： PURPOSE:To uniformly spread an adding material such as slag reforming agent, etc., onto the molten metal surface by fixing a conical distributor arranging plural dispersing hole on the whole circumferential face between a molten metal vessel and adding material charging chute. CONSTITUTION:The charging chute 1 is positioned above center of a ladle 10 and driven at the fixed speed of rotation through a motor 4 and speed reduc er 5 so as to be possible to uniformly charge the adding material in circumferen tial direction. Further, above the charging chute 1, a fixed speed discharging device 8 and hopper 9 for receiving the adding material are set. At below the outlet of this charging chute 1, the conical distributor 2 provided with plural holes at position matching the top with rotating axis of the charging chute 1, is set so as to be possible to spread the adding material at equal quantity to all over the radius direction. By this method, the adding material such as slag reforming agent, heat holding agent, etc., can be uniformly spread on the molten steel surface in the ladle.

7. 发明专利

JPH02179810A METHOD FOR OPERATING TOP AND BOTTOM BLOWING CONVERTER 失效
公开(公告)号：JPH02179810A
公开(公告)日：1990-07-12
申请号：JP33382588
申请日：1988-12-28
申请人： NIPPON STEEL CORP
发明人： TAKAMOTO HISASHI , YONEZAWA KIMITOSHI , KUGIMIYA SADAJI , OCHI KIYOSHI
IPC分类号： C21C5/35
摘要： PURPOSE:To improve Mn yield and to reduce iron content in slag and eroding rate of furnace wall refractory by specifying a bottom blowing gas flow ratio at inner and outer of the fire point in operation of a large-scaled converter specifying the total bottom blowing gas flow rate and gas flow ratio of top blowing and bottom blowing. CONSTITUTION:Stirring gas is blown into molten steel from a single or double tube bottom blowing tuyere at furnace bottom in the large-scaled top and bottom blowing converter having 4000-8000mm furnace bottom diameter and 250-380 Ton/ch at >=0.1Nm /t.min and also O2 gas jet is injected on the molten steel surface with a water cooled top blowing multi-holes lance. Then, this gas flow ratio of the top blowing and the bottom blowing is made to 0.05-0.20. In this operation, the gas flow rate from the bottom blowing tuyere at inside of fire point projecting plane under condition of the lance height at end period of the blowing, is made to 1.2-2.0 ratio to the total gas flow rate from the tuyere at outside.

8. 发明专利

JPS591627A Method for preventing hot crack of continuous casting billet 失效
标题翻译：防止连续铸造坯料热裂纹的方法
公开(公告)号：JPS591627A
公开(公告)日：1984-01-07
申请号：JP10896682
申请日：1982-06-24
申请人： Nippon Steel Corp
发明人： OGAWA HIROYUKI , OOTA KUNITERU , KOGA SUMIAKI , OCHI KIYOSHI
IPC分类号： B22D11/12 , B21B3/00 , B22D11/128 , C21D7/13 , C21D8/00 , C22C38/00
CPC分类号： C21D7/13
摘要： PURPOSE:To prevent hot crack and to reduce the energy cost by subjecting a continuously cast slab of a carbon steel or a special steel contg. regulated amounts of C, S and O as well as other common components to working accompanied by plastic deformation without carrying out cooling. CONSTITUTION:A carbon steel or a special steel contg., by weight,
摘要翻译：目的：通过对连续铸造的碳钢或特殊钢板坯进行处理，防止热裂纹和降低能源成本。调节量的C，S和O以及其他常见组分，以便在不进行冷却的情况下伴随塑性变形。构成：碳钢或特殊钢，按重量计，<= 1.0％C，<= 0.028％S和<= 0.018％O以及其他常见组分，同时满足方程式I，II [其中x为量（％），y为O的量（％），z为S的量（％）]连续铸造。所得到的铸造板坯在不进行冷却的同时进行塑性变形。通过该方法，特别是在直接轧制的情况下可以防止热裂纹。

9. 发明专利

JPS60234913A ALTERNATE STRONG AND WEAK OXYGEN BLOWING STEEL MAKING PROCESS 失效
公开(公告)号：JPS60234913A
公开(公告)日：1985-11-21
申请号：JP9087984
申请日：1984-05-09
申请人： NIPPON STEEL CORP
发明人： KOGA SUMIAKI , NISHIMURA MITSUHIKO , OCHI KIYOSHI , BABA KENICHI
IPC分类号： C21C5/30 , C21C5/32 , C21C5/35
摘要： PURPOSE:To increase the temp. of molten iron by decarbonization and to increase the blending ratio of scrap iron in a steel making material by using molten iron which is previously desiliconized, dephosphorized, and desulfurized as an essential iron source, and repeating alternate strong and weak top blowing of oxygen against the surface of molten iron to make steel. CONSTITUTION:An agitating bottom gas blowing tuyere 4 is optionally provided to a vessel obtained by lining an iron shell 1 with a refractory material 2, and an oxygen blowing lance 3 is provided to a top-blown oxygen steel making furnace. Molten iron 5 which is previously desiliconized, dephosphorized, and desulfurized is charged into said furnace as an essential iron source, and oxygen is blown in from the top as an essential decarbonization means to make steel. The depth of a dent 6 formed on the surface of molten iron by the top blowing of oxygen is made alternately large and small, and the alternate strong and weak blowing of oxygen is continuously repeated. The secondary combustion of carbon is promoted in this way, and the temp. of molten iron is increased by decarbonization. Consequently, the blending ratio of scrap iron in the steel making material is increased, and the degree of freedom in selecting the kind of iron sources can be expanded.

10. 发明专利

JPH09206891A CASTING MOLD FOR CONTINUOUS CASTING 失效
公开(公告)号：JPH09206891A
公开(公告)日：1997-08-12
申请号：JP3706596
申请日：1996-02-01
申请人： NIPPON STEEL CORP
发明人： MISUMI HIDEYUKI , SHIRAGAMI TAKAYUKI , OCHI KIYOSHI , KOMORI TOSHIYA , OKUHARA KEISUKE
IPC分类号： B22D11/16 , B22D11/04
摘要： PROBLEM TO BE SOLVED: To stably produce a good slab by imparting the grooves of a specific depth and width at specific intervals in the specific range of a casting mold. SOLUTION: The casting mold 1 is composed of long side casting mold walls 1a and short side casting mold walls 1b. The inside surfaces of these long side casting mold walls 1a are provided with slits 2. The slab is produced by using the casting mold 1 in a continuous casting method. At this time, the grooves of 0.1 to 0.3mm depth and 1.0 to 4.0mm width are imparted at the intervals satisfying equation I in a range from at least the part upper by 20mm from the meniscus 3 position of the casting mold 1 to 70mm under the meniscus 3 and in a range of at least 50mm from the corner of the casting mold 1. In the equation, W: the width (mm) of the grooves, I: the intervals (mm) of the grooves. As a result, the corner crack which occurs in the corner parts of the slab surface is surely suppressed.

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