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31. 发明专利

JPH06306464A PRODUCTION OF HOT ROLLED AUSTENITIC STAINLESS STEEL PLATE 失效
公开(公告)号：JPH06306464A
公开(公告)日：1994-11-01
申请号：JP10333693
申请日：1993-04-28
申请人： NIPPON STEEL CORP
发明人： KOMORI TADASHI , YANAI TAKASHI , FUJIWARA SHIGERU , KIMOTO HIROSHI
IPC分类号： B21B3/02 , C21D8/02 , C21D9/46
摘要： PURPOSE:To efficiently produce a hot rolled stainless steel plate excellent in surface characteristics from a cast slab of austenitic stainless steel inferior in hot workability. CONSTITUTION:A molten austenitic stainless steel is cast continuously, and the resulting cast slab is heated up to 1200-1280 deg.C and successively subjected to hot roughing at 5-30% draft, by which a breakdown-rolled material is prepared. The surface of this breakdown-rolled material is ground by 0.5-5mm and then reheating is done up to 1200-1280 deg.C. Successively, hot rolling is done down to prescribed plate thickness. By this method, the high-quality hot rolled plate can stably be supplied.

32. 发明专利

JPH06192720A METHOD REMOVING IMPURITY IN CHROMIUM-CONTAINING MOLTEN STEEL 失效
公开(公告)号：JPH06192720A
公开(公告)日：1994-07-12
申请号：JP34486692
申请日：1992-12-24
申请人： NIPPON STEEL CORP
发明人： NAKAO RYUJI , TANAKA SHIGENORI , YANAI TAKASHI , YOSHIMURA YUJI
IPC分类号： C21C7/00 , C21C7/076
摘要： PURPOSE:To provide a method for reducing Pb, Zn and Sn having bad influence on hot-workability of a steel to the aimed values or below and efficiently removing these impurities in the last refining stage for chromium-containing molten steel. CONSTITUTION:In the last refining stage for chromium-containing molten steel, in order to reduce the impurity concns. of Pb, Zn and Sn in the molten steel to the aimed values or below, in consideration for return of Pb, Zn and Sn from material added in the last refining stage, gas blowing is executed at the flow in rate QG satisfying the following (1) inequality. QG >=-alphaM10 T .1n([M]t/[M]O)...(1). By this method, the product not conforming to spelifications for Pb, Zn and Sn contents is prevented and the excess gas blowing in is prevented an inexpensive adding material can be used and the refining cost can be reduced.

33. 发明专利

JPH0623488A MOLD FOR HORIZONTAL CONTINUOUS CASTING EQUIPMENT 失效
公开(公告)号：JPH0623488A
公开(公告)日：1994-02-01
申请号：JP10993392
申请日：1992-04-28
申请人： KAWASAKI HEAVY IND LTD , NIPPON STEEL CORP
发明人： KANEKO HIDEO , KAMISHIRO HATSUYOSHI , SATO MASARU , YANAI TAKASHI , MATSUMURA SHOGO , KAWAI HIROYUKI
IPC分类号： B22D11/04 , B22D11/059
摘要： PURPOSE:To provide a mold for horizontal continuous casting equipment having excellent durability without erosive accident by using a material having excellent characteristic of heat resistance, high temp. strength, high temp. hardness, etc., and adopting a structure having excellent heat conductivity, at the part ordinarily having large wearing in the mold. CONSTITUTION:In the mold for horizontal continuous casting equipment closely connecting a tundish 1 with the mold 19 through a feed nozzle 3 and a brake ring 4, the wear plate forming so as to become longer than drawing stroke of a cast billet is formed with a beryllium-copper alloy and is shrinkage-fitted to the inner surface of end part of the mold contacting with the brake ring.

34. 发明专利

JPS6352756A SUBMERGED NOZZLE FOR CONTINUOUS CASTING 失效
公开(公告)号：JPS6352756A
公开(公告)日：1988-03-05
申请号：JP19396186
申请日：1986-08-21
申请人： NIPPON STEEL CORP
发明人： YANAI TAKASHI , TSUCHIDA HIDENORI , ARIYOSHI HARUKI
IPC分类号： B22D11/10 , B22D41/50
摘要： PURPOSE:To favorably bring the discharging flow of molten metal into contact with mold powder and to reduce the wave on the surface of molten metal by arranging the discharging hole at both side faces near the closed bottom part of submerged nozzle and constructing the discharging hole by the specific shape. CONSTITUTION:The discharging hole 7 for the molten metal is arranged at both side faces near the closing bottom part 4 of submerged nozzle 1 for continuous casting and the molten metal is poured into a mold 10 through a hole 7. The upper face 8 of this hole 7 is inclined to upward toward outer side and the lower face 9 is horizontally or inclined to upward toward outer side, and in case of using theta1 for angle of the upper face 8 to the horizontal direction and theta2 for angle of the lower face 9 to the horizontal direction, the discharging hole is provided under conditions that theta1 is larger than theta3 and height D at the outside is larger than height (d) at the inside for the hole 7. Further, hole area S0 at the outside is to provide to larger than hole area S1 at the inside fo. the discharging hole 7 and a widened angle theta3 in the hole 7 is provided. Further, in case of using (h) for depth from the molten surface in the mold 10 to the upper end of outside for the hole 7 and L for distance from the side face of the nozzle 1 to the side wall of mold 10, it is desirable to be theta1>tan . h/L > theta2. 3 : mold powder.

35. 发明专利

JPS564352A ELECTROMAGNETIC RABBLING METHOD IN CONTINUOUS CASTING 失效
公开(公告)号：JPS564352A
公开(公告)日：1981-01-17
申请号：JP7693779
申请日：1979-06-20
申请人： NIPPON STEEL CORP
发明人： IKEHARA YASUMASA , YANAI TAKASHI
IPC分类号： B01F13/08 , B22D11/10 , B22D11/115 , B22D11/12 , B22D27/02
摘要： PURPOSE:To hold rabbling thrust at a desired value and obtain the slab of homogeneous cast structure by controlling the cooling water flow of the slag on the mold side than an electromagnetic rabbling device by the detecting signal of the magnetism or surface temperature of the frozen shell of the slab near the electromagnetic rabbling device. CONSTITUTION:The unfrozen part 1 of the slab in continuous casting of steel is rabbled by an electromagnetic rabbling device 3. The magnetism of the surface of the slab frozen shell 2 near the device 3 is detected with a magnetism detector 5. The detector 5 comprises installing the coils wound with fixed windings spacially by a fixed distance from the slab, applying fixed voltage to these coils and detecting the impedances of the coils. The detected magnetism is compared with the set magnetism of the magnetic value corresponding to the curie point of cast steel kinds in a comparator 6. The signal of the comparator 6 is input to a secondary cooling water flow control unit 7. Depending upon the positive and negative of the signal of the comparator 6, the unit 7 controls the cooling water flow of the cooling water piping 4 on the mold 8 side by the device 3.

36. 发明专利

JPS5247522A PROCESS FOR CONTINUOUS CASTING OF FERRITEESYSTEM STAINLESS STEEL 失效
公开(公告)号：JPS5247522A
公开(公告)日：1977-04-15
申请号：JP12329475
申请日：1975-10-15
申请人： NIPPON STEEL CORP
发明人： TAKEDA MASAO , IKEHARA YASUMASA , YANAI TAKASHI , TAKEUCHI HIDEMA , MATSUMURA SHIYOUGO
IPC分类号： B22D11/00 , B22D11/10

37. 发明专利

JPS51149126A REGULATOR OF TREMOR FOR FLOW CONTROL OR THE LIKE 失效
公开(公告)号：JPS51149126A
公开(公告)日：1976-12-21
申请号：JP7413375
申请日：1975-06-17
申请人： NIPPON STEEL CORP
发明人： IKEHARA YASUNOBU , YANAI TAKASHI
IPC分类号： B22D11/18 , B22D11/10 , B22D37/00 , B22D41/38 , G05D7/00

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