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1. 发明专利

JPS5565317A MANUFACTURE OF STAINLESS STEEL EXCELLENT IN INTERGRANULAR CORROSION RESISTANCE AND SURFACE CLEANNESS 失效
公开(公告)号：JPS5565317A
公开(公告)日：1980-05-16
申请号：JP13641878
申请日：1978-11-06
申请人： NIPPON STEEL CORP
发明人： TAKEUCHI HIDEMARO , MATSUMURA SHIYOUGO , KATAYAMA TAKESHI , IKUNO ITSUO , TAKEDA KOUICHI
IPC分类号： C21D1/00 , C21D1/09 , C21D6/00 , C21D9/00
摘要： PURPOSE:To improve the intergranular corrosion resistance and the surface cleanness of stainless steel, by heating the surface of semifinished stainless steel product such as slab to a temp. not lower than the m.p. of Cr carbide or nonmetal inclusions to melt the surface to a proper depth. CONSTITUTION:Plural plasma torches are arranged in a row above the surface of a stainless steel slab, bloom, or billet etc. 4, and the surface is surrounded by a seal case 2. Hereby the portion to be treated is covered by inert gas so that the stainless steel is prevented from being oxidized. Between the plasma torches 1 and the stainless steel slab is placed an electromagnetic coil 3, hence the plasma arcs 5 are reciprocated to increase the arc breadths 6, thereby stainless steel slab is melted in belt shape to a depth of 1-15mm. The Cr carbide precipitated in granular boundary is melted and formed into solid solution by the quenching followed. Nonmetal inclusions such as nitride or oxide of Ti added as a stabilizer for C is dispersed finely in the stainless steel, improving the properties of the surface structure of the slab etc., and preventing the development of intergranular corrosion.

2. 发明专利

JPS5522473A PRODUCTION OF SLAB HAVING HIGH HOT WORKABILITY 失效
公开(公告)号：JPS5522473A
公开(公告)日：1980-02-18
申请号：JP9580878
申请日：1978-08-08
申请人： NIPPON STEEL CORP
发明人： TAKEUCHI HIDEMARO , MATSUMURA SHIYOUGO , KATAYAMA TAKESHI , IKUNO ITSUO , TAKEDA KOUICHI
IPC分类号： B22D11/124 , B21B1/00 , B21B1/02 , B21B3/02 , B22D11/12 , C21D9/00
摘要： PURPOSE:To enhance hot workability by melting the surface layer of the nickel base stainless steel slab sthrough continuous casting then freezing the same at the specific rate of cooling. CONSTITUTION:The surface layer the nickel base stainless steel slab having been frozen through continuous casting is remelted by plasma arc, etc., after which it is cooled to freeze at the rates of cooling above 3 deg.C/sec in succession. Such treatment obviates the production of internal cracks and makes spacings between the secondary dendrite arms 30mu or under, thus yielding the fine columnar crystal or equiaxial crystal. Since the surface layer of the slab which receives working particularly strongly becomes the foregoing structure (b) from the structure (a), the production of cracks, etc. during hot working such as hot rolling or other is reduced.

3. 发明专利

JPS55126313A SCARFING METHOD FOR SURFACE OF STEEL MATERIAL 失效
公开(公告)号：JPS55126313A
公开(公告)日：1980-09-30
申请号：JP3200579
申请日：1979-03-19
申请人： NIPPON STEEL CORP
发明人： IKUNO ITSUO , MATSUMURA SHIYOUGO , TAKEUCHI HIDEMARO , KAWAGUCHI TADAO , KATAYAMA TAKESHI
IPC分类号： B21B45/00
摘要： PURPOSE:To easily prevent the ingiltration, etc., of air, and to efficiently scarf the surface, by spreading or applying the powder or granule flux onto the steel material surface, and then, by induction heating the material to melt the skin layer and the flux. CONSTITUTION:The flux is uniformly spread on the slab 1 traveling in the arrow direction at the specified constant speed using the flux spreader 3. Next, the slab 1 is induction heated just under the inductor 7; hereby, the flux 4 melts before the slab surface melts, and the surface of the slab 1 is covered with the molten flux 4 and is protected from the contamination like as oxidization, nitrogen absorption, decarburization, etc., during the melting period and following high temperature period. The molten part in surface of the slab 1 passed just under the inductor 7, is quickly cooled to solidify owing to the inward heat conduction and the outward heat radiation; hereby, the surface flaw of the slab 1 is scarfed. After that, the flux is peeled off from the slab 1, in accordance with necessity, by the jet water being shot from the high pressure jetter 6.

4. 发明专利

JPS5260230A METHOD OF CONTINUOUS CASTING FOR NIICR STAINLESS STEEL 失效
公开(公告)号：JPS5260230A
公开(公告)日：1977-05-18
申请号：JP13669475
申请日：1975-11-13
申请人： NIPPON STEEL CORP
发明人： TAKEDA MASAO , IKEHARA YASUMASA , KOMANO TADAAKI , TAKEUCHI HIDEMA , MATSUMURA SHIYOUGO
IPC分类号： C22C38/00 , B22D11/00 , B22D11/10 , C21C7/00 , C22C38/40

5. 发明专利

JPS6068138A CONNECTING METHOD OF CORE FOR CONTINUOUS CASTING 失效
公开(公告)号：JPS6068138A
公开(公告)日：1985-04-18
申请号：JP17313583
申请日：1983-09-21
申请人： NIPPON STEEL CORP
发明人： OKA HIDETAKA , MATSUMURA SHIYOUGO
IPC分类号： B22C9/10 , B22D11/00
摘要： PURPOSE:To connect securely cores to each other in the stage of joining the cores during continuous casting by forming connecting ends to joint shapes which fit to each other, heating the connecting end of the succeeding core to expand, fitting and connecting the ends and cooling the connected ends thereafter to shrink. CONSTITUTION:The joining ends 2-1, 2-2 of cores 1-1, 1-2 during continuous casting are so formed as to fit to each other. The connecting end 2-2 of the core 1-2 to be connected is heated by a heating means 3 to expand said end. The end 2-2 is then fitted to the end 1-2. When the fitted parts cool, the cores 1-1, 1-2 are securely connected to each other. The fitted parts are more surely connected if said parts are intermeshed B by pressing from above and cooling.

6. 发明专利

JPS57130741A CONTINUOUS CASTING METHOD FOR FAULTLESS INGOT 失效
公开(公告)号：JPS57130741A
公开(公告)日：1982-08-13
申请号：JP1464781
申请日：1981-02-03
申请人： NIPPON STEEL CORP
发明人： TAKEUCHI HIDEMARO , MATSUMURA SHIYOUGO , HIDAKA RIYOUICHI , IKEHARA YASUMASA , SAEKI TSUYOSHI
IPC分类号： B22D11/07 , B22D11/053 , B22D11/10 , B22D11/112 , B22D11/114 , B22D11/116 , B22D11/16
摘要： PURPOSE:To produce a faultless ingot permitting rolling without conditioning in oscillation casting by making the max. descending speed of a mold lower than the drawing speed of the ingot or if it is above said speed, by performing oscillation in a specific range. CONSTITUTION:In a sine curve system which is the most common oscillation type for molds, in the case of V/S.f =S =pi where V is defined as an ingot drawing speed (mm./min), f as an oscillation cycle (C/min), ?and S as an oscillation stroke (mm.), the casting of a faultless ingot is made pos?sible by using a powder additive of

7. 发明专利

JPS58224044A Continuous casting method of hollow round steel 失效
标题翻译：中空铸钢连续铸造方法
公开(公告)号：JPS58224044A
公开(公告)日：1983-12-26
申请号：JP10778882
申请日：1982-06-23
申请人： Nippon Steel Corp
发明人： TAKEUCHI HIDEMARO , MATSUMURA SHIYOUGO , OKA HIDETAKA
IPC分类号： B21C37/06 , B22D11/00
CPC分类号： B22D11/006
摘要： PURPOSE:To obtain a hollow round steel having no limits in length and having an excellent characteristic of the inside surface by inserting a steel pipe, which is produced continuously above a mold, into the mold and using the same as a core. CONSTITUTION:A steel pipe 4 to serve as a core is produced continuously above a mold 3. While such pipe 4 is inserted continuously into the central part of the mold 3, the molten steel 2 in a tundish 1 is charged between the steel 4 and the mold wall. The inside surface of the steel pipe 4 inserted into the mold 3 in this stage is cooled by feeding water or air. The cast steel and the pipe 4 are drawn in one body. The hollow round steel having the excellent characteristic on the inside surface is obtained without any limit in the length.
摘要翻译：目的：通过将连续地在模具上方制造的钢管插入模具中并使用其作为芯，获得长度无限制且具有优异的内表面特性的中空圆钢。构成：在模具3的上方连续地制造作为芯的钢管4.当这种管4连续地插入模具3的中心部分时，将中间包1中的钢水2装入钢4和模具墙。在该阶段中插入模具3中的钢管4的内表面通过供给水或空气而被冷却。铸钢和管4被拉成一体。获得内表面上具有优异特性的中空圆钢，长度无任何限制。

8. 发明专利

JPS55125283A DESCALING METHOD OF SPECIAL STEEL 失效
公开(公告)号：JPS55125283A
公开(公告)日：1980-09-26
申请号：JP3200679
申请日：1979-03-19
申请人： NIPPON STEEL CORP
发明人： IKUNO ITSUO , MATSUMURA SHIYOUGO , TAKEUCHI HIDEMARO , KAWAGUCHI TADAO , KATAYAMA TAKESHI
IPC分类号： C23G5/00 , B21B45/00 , C23G3/00
摘要： PURPOSE:To descale securely by single stage treatment, by induction heating of a material to be descaled after flux is spread on the surface of the material so as to melt the flux, then by peeling the flux after solidified by cooling. CONSTITUTION:A hot rolled strip 1 is made to travel in the direction of an arrow under a suitable tension given by pinch rolls 2, 2', and a flux 3 is spread on the strip 1 by a spreader 4. The flux 3 uniformly spread on the strip 1 moves in the direction A B and melts by electromagnetic induction heating when it passes just under an inductor 5, so that the flux 3 absorbs the oxide scale present on the surface of the strip 1. The surface temp. of the strip 1 is lowered rapidly after the strip 1 has passed the inductor 5, hence the flux 3 is also cooled and solidified. The solidified flux is removed by a bending roll 6 and by the spray of water from a high press. water injector 7, thereby manufacturing strip from which scale is removed.

9. 发明专利

JPS5564964A PRODUCTION OF CLAD SLAB 失效
公开(公告)号：JPS5564964A
公开(公告)日：1980-05-16
申请号：JP13841278
申请日：1978-11-11
申请人： NIPPON STEEL CORP
发明人： MATSUMURA SHIYOUGO , IKUNO ITSUO , NAKAMURA YASUSHI , TAKEDA KOUICHI
IPC分类号： B23K9/04
摘要： PURPOSE:To readily produce the clad slab of high adhesion power with simple equipment by heating and melting the slab surface layer and clad blank by plasma arc in an inert atmosphere on the slab surface to form a molten pool then allowing the same to solidify. CONSTITUTION:A plate-form clad blank 1 is placed on a base metal slab 2. While it is being moved on rollers in the arrow direction, the surface layer of the slab 2 and blank 1 are simultaneously melted by the plasma arc by the plasma torch 5 which is covered with a case 4 whose inside is set in an inert atomsphere. Since the plasma arm is of high heat density, a molten pool is rapidly formed on the slab 2. When this is solidified, the blank 1 fusion bonds onto the slab 2 and the clad slab having this as its clad layer 3 is obtained.

10. 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

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