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1. 发明专利

JPS5573481A WELD REPAIR METHOD OF SHEET IRON SHELL CRACK 失效
公开(公告)号：JPS5573481A
公开(公告)日：1980-06-03
申请号：JP14601378
申请日：1978-11-28
申请人： SUMITOMO METAL IND
发明人： KATOU ICHIROU , IKEDA NOBUHIKO , YOSHIMOTO HISAYOSHI , KOJIMA TATSU , SOUAN HIDEAKI
IPC分类号： B23K31/00
摘要： PURPOSE:To prevent occurrence of re-cracking in the repair welded part, by inserting a special refractory of cannon ball shape having a curved peak head into the center of groove root part, after building up the V-shaped weld groove part to the length of the refractory main body, and then building up the rest of the groove, when welding the crack in blast furnace shell by welding. CONSTITUTION:A V-shape is machined in a weld groove part 13 between a shell 11 and a shell (or a replacement steel plate) 12, which corresponds to the weld groove part between a slot part after drilling off the crack caused in a blast furnace sheel or a cut-off part after cutting off the crack, and a steel plate being inserted in the vacancy thereof. Part of the groove part 13 is built up by welding 14, and a refractory specified below 15 is inserted into the center of this root part, and the remainder of the groove is built up by welding 16. Namely, as the refractory, the section is similar to that of a cannon ball shape, and it consists of a peak head of R>=2.5mm and main body, and the overall length L thereof is less than 1/2 of the thickness t of the shell. The length l of the preliminary build-up welding on the groove part 13 is approximately equal to the length l of the refractory main body. A metal of which elongation is more than 25% is used in build-up welding.

2. 发明专利

JPS5541958A SEALING METHOD FOR GAS AT CRACK PART OF IRON SHELL OF BLAST FURNACE 失效
公开(公告)号：JPS5541958A
公开(公告)日：1980-03-25
申请号：JP11498778
申请日：1978-09-18
申请人： SUMITOMO METAL IND
发明人： KATOU ICHIROU , MORITA YOSHIYASU , MORIMOTO KIYOHIRO , SEGUCHI MANABU , SOUAN HIDEAKI
IPC分类号： C21B7/00 , C21B7/08
摘要： PURPOSE:To apply the sealing free from the reoccurrence of gas leak, by bending the iron plate to form the connector consisting of the curved zone at the middle and legs on both sides, and by welding to the iron shell legs respectively on each side of the crack as the border. CONSTITUTION:The iron plate is bent to form the circularly curved zone 13 at the middle and legs 14 on both sides, and the open space between two legs 14 is closed with the cover 15; hereby, the expandable connector 12 is formed. The gouging is applied to the end edge of the crack 11 so as to form the channel type groove 16, and the legs 14 of the connector 12 is inserted into the groove 16 vertically to the surface of the iron shell 8. At the same time, the cover 15 is places so as to contact with adjoining iron shells 9, 10, and two legs 14 are respectively groupe welded to the iron shell on each side; hereby, the crack 11 is sealed. Since this sealed crack expands together with the displacement of the iron shells 8a, 8b, while the legs 14 of the welded connector 12 are keeping the airtightness, the generation of cracks in the weld zone is prevented.

3. 发明专利

JPS54155154A EXECUTING METHOD FOR WELDING 失效
公开(公告)号：JPS54155154A
公开(公告)日：1979-12-06
申请号：JP6393178
申请日：1978-05-30
申请人： SUMITOMO METAL IND
发明人： KATOU ICHIROU , MORITA YOSHIYASU , KAWASHIMA JIYUICHI , SOUAN HIDEAKI
IPC分类号： B23K33/00 , B23K9/02 , B23K9/04 , B23K37/06
摘要： PURPOSE:To moderate the stress concentration at the toe of root of the crack, when the crack or the like of the blast-furnace's iron shell is to be repaired by welding, by executing the overlay welding upon the crack, to which the gouging work is previously applied, after inserting the notched pipe or the round bar provided with the slit of round tip, into above crack. CONSTITUTION:In case of the crack or the like of the blast-furnace's iron shell, which can be repaired by welding only from one side, or in case that the perfect penetration is hardly obtainable because of the existence of root gap, the gouging work 3 is applied from outside to the crack 2 generated at the iron shell 1; after that, a half or a slit pipe 4, or a round bar provided with the slit of round tip, is inserted into the depth of the gouged portion 3 so as to cover the toe of root of the crack 2, and the overlay welding 7 is executed upon the inserted pipe or bar. Or in case of the structure in whose groove 9 there exists the root gap 8 being unrequired for its removal, the overlay welding is executed after inserting the pipe or round bar similarly to above case.

4. 发明专利

JPS60184608A REPAIRING METHOD OF FURNACE WALL OF BLAST FURNACE 失效
公开(公告)号：JPS60184608A
公开(公告)日：1985-09-20
申请号：JP3943584
申请日：1984-02-29
申请人： SUMITOMO METAL IND
发明人： KOUTATSU HIROSHI , SOUAN HIDEAKI
IPC分类号： C21B7/06 , C21B7/10 , F27D1/16
摘要： PURPOSE:To improve the durability of the repaired surface and to prolong the life of the titled blast furnace by inserting a previously-prepared repairing panel having a cooling tube into the part to be repaired in the blast furnace, and filling the clearance, etc. between the panel and the inner surface of the furnace wall with an amorphous refractory material. CONSTITUTION:A repairing panel P has a plane coil part 20A and an extraction supporting tube part 20B, and is formed of a cooling tube wherein a cooling fluid flows and a group of unit molded refractory panels 21. Said unit panels 21 are separated from each other along the coil part 20A, and united to a body. After putting said panel P into the blast furnace, the supporting tube part 20B is inserted into an opening hole 11 of the furnace wall and fixed to form a clearance 14 between the panel P and the inner surface of the furnace wall. Then the clearance 14 and the clearance between the panels 21 are filled with an amorphous refractory material 15A.

5. 发明专利

JPS5573806A FURNACE BUILDING METHOD OF BLAST FURNACE HEARTH PART 失效
公开(公告)号：JPS5573806A
公开(公告)日：1980-06-03
申请号：JP14567778
申请日：1978-11-24
申请人： SUMITOMO METAL IND
发明人： SOUAN HIDEAKI , MORI KENJI
IPC分类号： C21B7/06
摘要： PURPOSE:To prevent the erosion of the hearth part by interposing metal titanium powder in the joints of refractory bricks at the time of brick building of the blast furnace hearth part. CONSTITUTION:When metal titanium powder is interposed in the vertical and lateral joints 7 of refractory bricks 6 in the longitudinal laid part 4 of the furnace bottom 2 at the time of brick building of the blast furnace hearth part 1, then the metal titanium melts in molten iron along with progression of blast furnace operation and further it becomes TiN, TiC, etc. owing to temperature changes and the changes in nitrogen partial pressure, tnereby crystallizing on the brick surfaces. These crystals grow without being discharged to outside the furnace and form titanium bears, thus covering the brick surfaces. Hence, the hearth part is protected by the titanium bears and the erosion by the subsequent operations is inhibited.

6. 发明专利

JPS5573480A SHEET IRON SHELL CRACK PROPAGATION PREVENTIVE METHOD 失效
公开(公告)号：JPS5573480A
公开(公告)日：1980-06-03
申请号：JP14601278
申请日：1978-11-28
申请人： SUMITOMO METAL IND
发明人： KATOU ICHIROU , IKEDA NOBUHIKO , MORIMOTO KIYOHIRO , KOJIMA TATSU , SOUAN HIDEAKI
IPC分类号： B23K31/00
摘要： PURPOSE:To prevent propagation of crack occurring in a sheet iron sheel, by providing a cut-off part in the shape of combination of a plurality of circles at the destination of propagation of crack caused in a shell such as blast furnace shell, and inserting a steel plate of specified PCM value to this cut-off part, then welding the steel plate and the shell. CONSTITUTION:When a crack 2 is initiated in a blast furnace shell 1 and is estimated to propagate, a stop hole 5 having the shape of combination of a plurality of circles is provided at the destination of propagation. Next, a steel plate (1) expressed in the following formula of which value of PCM is 0.18 or less, having the same shape as the stop hole 5, is inserted into the stop hole 5, and is welded to the shell 1. Namely, PCM=C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/ 10+5B(%).

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