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11. 发明专利

JPS61515A GAS-BLOWING SMELTING METHOD 失效
公开(公告)号：JPS61515A
公开(公告)日：1986-01-06
申请号：JP12145484
申请日：1984-06-13
申请人： DAIDO STEEL CO LTD
发明人： SAITOU TETSUYA , KATOU TOKIO , MIZUGUCHI KEIICHI
IPC分类号： C21C7/072 , C21C7/068 , F27D3/16
摘要： PURPOSE:To eliminate the local swelling of the surface of molten metal and to reduce the damage of refractory by providing an upper-stage and the lower-stage tuyere to a smelting vessel, and specifying the supply of respective gases and the ratio of the supply from the upper tuyere and the lower tuyere. CONSTITUTION:The upper-stage and the lower-stage tuyere 10a, 10b, and 10c are provided at positions different in height in a gas-blowing smelting vessel. The supply of gas from each tuyere 10a, 10b, and 10c is regulated in the range of 0.3-2.0Nm /ton.min. The ratio of supply of gas from the upper-stage tuyere 10b and the supply from the lower-stage tuyeres 10a and 10c is regulated in the range 1:1.5-1:4.0. By said smelting method, gentle swelling is formed without generating local swelling on the surface of molten steel 11 and slag 12, and the molten steel 11 is agitated and smelted. Accordingly, the generation of splashes is reduced, and the damage of the refractory in the vicinity of the surface of molten metal is reduced.

12. 发明专利

JPS6017011A VESSEL FOR REFINING BY BLOWING OF GAS 失效
公开(公告)号：JPS6017011A
公开(公告)日：1985-01-28
申请号：JP12240083
申请日：1983-07-07
申请人： DAIDO STEEL CO LTD
发明人： SAITOU TETSUYA , HAYAKAWA SHIZUNORI , MIZUGUCHI KEIICHI , KATOU TOKIO
IPC分类号： C21C7/072 , C21C5/34 , C21C7/068
摘要： PURPOSE:To prevent splashing of molten metal and slag during refining in the stage of decarburizing and refining a stainless steel, etc. in an AOD type converter by providing tuyeres for blowing a gaseous mixture composed of O2 and Ar at different levels in a horizontal direction. CONSTITUTION:Tuyeres 10a, 10b, 10c for blowing a gaseous mixture composed of O2 and Ar are disposed at different levels in the stage of decarburizing and refining a molten stainless steel in an AOD type converter. More specifically, the tuyeres 10a, 10c are provided at the same level at theta2=60 deg. space toward the central direction of the furnace inside and the tuyere 10b is provided in the intermediate position (theta3=30 deg.) at the plane of 10a and 10c in the position upper than 10a, 10c. A gaseous mixture composed of O2+Ar is blown through the tuyere 10b with the ejecting force smaller than the ejecting force of the gas from the tuyeres 10a, 10c during refining, by which the splashing owing to the build-up of the molten steel 31 and molten slag 32 in the furnace is obviated and the consequent damage of refractories 25, 27 in the furnace is decreased.

13. 发明专利

JPH04263009A METHOD FOR HEAT-TREATING STEEL 失效
公开(公告)号：JPH04263009A
公开(公告)日：1992-09-18
申请号：JP532091
申请日：1991-01-21
申请人： DAIDO STEEL CO LTD
发明人： MIZUGUCHI KEIICHI , WATANABE KAZUNORI , SAKO KAZUAKI
IPC分类号： C21D1/76
摘要： PURPOSE:To enable heat treatment for steel material of plural kinds of different C contents simultaneously without developing decarbonization and carburization. CONSTITUTION:Atmospheric gas containing N2 as the main component and a small quantity of CO or CO+H2 is fed into a heating furnace, and during raising temp. of the steel materials to 700 deg.C, composition of an atmospheric gas is controlled so as to satisfy the following conditions, 1 to 4% CO, /(%CO2)}=50 to 250. Under securing this condition, the steel materials are heated to the prescribed temp. exceeding 700 deg.C for heat treatment.

14. 发明专利

JPH01178363A METHOD AND DEVICE FOR POURING MOLTEN METAL 失效
公开(公告)号：JPH01178363A
公开(公告)日：1989-07-14
申请号：JP81588
申请日：1988-01-06
申请人： DAIDO STEEL CO LTD
发明人： TAMATOSHI OSAMU , MIZUGUCHI KEIICHI
IPC分类号： B22D11/10 , B22D11/106 , B22D41/08 , B22D41/58
摘要： PURPOSE:To facilitate the manufacture of a special steel of high quality by starting the pouring with sealing the curtain of an inert gas and continuing the pouring with shutting off the outside air by bringing a flange into contact with a ring. CONSTITUTION:The ring 4 of a heat resistant fiber forming body is mounted on the mouth part of a pouring pipe 3 and the air inside the pouring pipe 3 is replaced with an inert gas. Thereafter, pouring is started with sealing the circumference of the molten metal 5 flowed down from a nozzle 2 by the curtain 6 of the inert gas injected from the flange 21 provided on the nozzle 2. A molten metal container 1 is descended at the time when the center of the nozzle 2 is allowed to coincide with that of the pouring pipe 3 and the pouring is continued with cutting off the outside air by bringing the flange 21 into contact with the ring 4. The oxidation of the alloy component in the molten metal by the oxygen in the atm. and the boiling by the contamimated atm. are thus prevented and the generation of a defective part can be prevented.

15. 发明专利

JPS61174313A METHOD FOR REFINING STEEL 失效
公开(公告)号：JPS61174313A
公开(公告)日：1986-08-06
申请号：JP1404485
申请日：1985-01-28
申请人： DAIDO STEEL CO LTD
发明人： MORII TADASHI , MIZUGUCHI KEIICHI
IPC分类号： C21C1/02 , C21C7/00 , C21C7/064 , C21C7/068 , C21C7/072
摘要： PURPOSE:To prolong the life of the refractories of a main refining furnace by blowing finely powdered desulfurizing agent into molten steel in a preliminary refining furnace to carry out prescribed preliminary desulfurization before the molten steel is decarburized and desulfurized in the main refining furnace. CONSTITUTION:Steel melted in a melting furnace is poured into a refining vessel, where the molten steel is chiefly decarburized and desulfurized. Prior to this refining in the main refining furnace, a finely powdered desulfurizing agent is blown into the molten steel in a preliminary refining furnace together with a flow of an inert carrier gas to carry out preliminary desulfurization until the S content in the molten steel is reduced to

16. 发明专利

JPS6425938A REFINING METHOD FOR MOLTEN STEEL BY ARC FURNACE 失效
公开(公告)号：JPS6425938A
公开(公告)日：1989-01-27
申请号：JP18059687
申请日：1987-07-20
申请人： DAIDO STEEL CO LTD
发明人： ARAKI TOSHIHIKO , MIZUGUCHI KEIICHI
IPC分类号： C21C5/52 , C22C33/04
摘要： PURPOSE:To reduce a metal oxide and to efficiently add the same to a molten steel at a low cost by blowing a reducing agent by a carrier gas from an immersion lance into the molten steel, while blowing the metal oxide by an inert carrier gas through a hollow arc electrode into the molten steel. CONSTITUTION:The molten steel 6 is refined by adding alloy components thereto under the arc heating by the hollow electrode 2 in an arc furnace body 1 housing the molten steel 6. The metal oxide 9 from a hopper 4A is entrained in the inert carrier gas and is blown through the above-mentioned hollow electrode 2 into the molten steel in the above-mentioned refining method. Furthermore, the reducing agent 8 from a hopper 4A is entrained in the carrier gas using the inert gas or air and is blown from the immersion lance 3 into the molten steel. One or more than one kinds among Si, Al, aluminum ash and carbon powder are used as the above-mentioned reducing agent 8 and one or more than one kinds among Cr2O3, NiO, MoO3, and WO3 are used as the metal oxide. The above-mentioned oxide is thereby reduced to the metal and is added to the molten steel 6. Formation of slag 7 and desulfurization are executable by blowing CaO and CaF2 as a slag forming agent further into the molten steel at this time.

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