Krosaki Harima Corporation | Date: 2017-02-08
Provided is an injection refractory material capable of improving sealability of a gap in a kiln or furnace. Specifically, in an injection refractory material applicable to a kiln or furnace, a composition thereof is adjusted such that, when the injection refractory material is heated in an environment having an ambient temperature of 80 to 500C, it undergoes a volume expansion of 1.3 times or more its initial volume before the heating. For example, the injection refractory material contains: thermoplastic plastic bodies each encapsulating liquefied gas, in an amount of 0.5 to 3 mass%; and silicate in an amount of 3 to 10 mass%, with respect to a total amount, 100 mass%, of the injection refractory material.
News Article | November 11, 2016
Refractories are non-metallic materials that have property to retain its structure even at high temperatures of above 1000 °F. Refractories are used in linings of furnaces, incinerators and reactors in many of the industries. Refractories find application in vessel lining construction of unshaped products, prefabricated elements and bricks in the industries. The key end-user industries for refractories include iron and steel, non-ferrous metals, non-metallic minerals; and non-metallic materials such as glass. Multiple refractory layers and additional insulation materials are necessary to protect the steel structure in the furnaces from aggressive processing conditions. Iron and steel was the largest end-user industry for refractories accounting for about 75% of total market in 2013. The growth of end-user industries and the increasing demand for high performance furnaces has been driving the global refractories market. However, due to increasing equipment efficiency, the refractory consumption of the end-user companies has been declining. The expansion of iron and steel companies in terms of acquisition of new raw material sites or increasing the number of processing plants are generating new demands for the refractories market. The global glass market is growing at fast pace due to its increasing demand from construction and corporate sectors. Refractories consumption per ton of the processed metal varies across the countries. For instance, Japan consumes about 10 kilograms of refractories per ton of steel, whereas with 23 kg/ton, it is very high in case of China. There are basically two categories of refractories in terms of form type namely bricks and shapes and monolithic. The bricks and shapes was the largest refractories segment in 2013 by form type, however, monolithic segment is expected to grow at a higher rate during 2014-2010. In terms of materials type, refractories can be classified into clay and nanoclay. Clay was the largest and fastest growing segment in the refractories market. The total global production of refractories in 2012 was observed to be 45.7 million tons and it is expected to cross 55 milion by 2020. The refractories industry in the recent few years have been observed engaged in some serious research and development which is also being in the development of new generation of refractories termed as Eco Refractories. These types of refractories will be used in furnances for alternative energy production including solar, wind, tidal, geothermal, hydrogen, nuclear and biomass. Asia Pacific was the largest market for refractories market in 2013 followed by Europe. China was the largest producer and consumer of refractories in Asia Pacific in 2013. China is also the one of the largest supplier of refractories raw materials such as refractory bauxite, magnesia, graphite, brown fused alumina and silicon carbide. The high rate of infrastructural development and growing consumer goods such as automobiles in the country is increasing the demand for iron and steel leading to the growth of refractories market in the country. The key companies in the refractories market include RHI AG, ANH Refractories Company, Calderys SA, Wugang Refractory Company Limited, Saint Gobain SA, Refratechnik Holding GmbH and Krosaki Harima Corporation.
Krosaki Harima Corporation | Date: 2012-11-30
A tundish nozzle is used in a device for exchanging tundish nozzles juxtaposed at a bottom of a tundish. The device includes a pair of first arms pressing and supporting a first lower nozzle located at an undersurface of a first upper nozzle, the first upper nozzle being placed at the bottom of the tundish. The device includes a pair of second arms pressing and supporting a second lower nozzle located at an undersurface of a second upper nozzle, the second upper nozzle being placed at the bottom of the tundish and next to the first upper nozzle. The pair of first arms and the pair of second arms are adjoined to each other, the pairs at least partly overlapping. The tundish nozzle includes a zirconia based nozzle inserted into an alumina based refractory, and is one of the first and second lower and upper nozzles.
Krosaki Harima Corporation | Date: 2012-03-09
The immersion nozzle for continuous casting, including a tubular body with a bottom, a pair of first outlets, and a pair of second outlets, wherein at least a lower section of the tubular body has a rectangular flat cross section; the two opposing first outlets are disposed in narrow sidewalls at the lower section; the pair of second outlets is disposed at the bottom; each of the first outlets is partitioned by a partitioning section formed at the first outlet into an upper outlet and a lower outlet; ridges formed between the partitioning sections respectively project into a passage from a wide inner wall of the passage; the pair of second outlets is disposed symmetrically to a central axis of the tubular body such that virtual faces extended from tilted faces of the second outlets intersect with each other in the passage.
Krosaki Harima Corporation | Date: 2011-02-02
An immersion nozzle 10 for continuous casting which reduces the drift of molten steel flowing from the outlets 14 of the nozzle 10 and reduces the level fluctuation at the molten steel surface and which is easy to manufacture. The immersion nozzle 10 includes: a tubular body 11 with a bottom 15, the tubular body 11 having an inlet 13 for entry of molten steel disposed at an upper end and a passage 12 extending inside the tubular body 11 downward from the inlet 13; and a pair of opposing outlets 14 disposed in a sidewall at a lower section of the tubular body 11 so as to communicate with the passage 12, the nozzle 10 characterized by a pair of opposing ridges 16 extending horizontally on an inner wall and projecting into the passage 12 from the inner wall 18 between the pair of outlets 14, the inner wall 18 defining the passage 12.
Krosaki Harima Corporation | Date: 2010-12-15
A zirconia-carbon-containing refractory includes aggregate grains, a carbon bond formed between the aggregate grains, 80% by mass or more of a ZrO_(2) component, and a carbonaceous material, in which the total volume of open pores and the carbonaceous material in the structure of the refractory is in the range of 25% to 42% by volume, open pores each having a diameter of 10 m or more account for 30% or less of the total volume of open pores in the structure of the refractory, and carbonaceous material grains each having a maximum length exceeding 45 m in the carbonaceous material in the zirconia-carbon-containing refractory account for less than 60% by mass of the total mass of the carbonaceous material except the bonding carbon in the zirconia-carbon-containing refractory.
Krosaki Harima Corporation | Date: 2011-03-16
A sliding nozzle device which automatically performs a series of operations of loading and unloading pressure between plates as well as opening and closing a slide frame; maintains the pressure without additional operations; and operates at full stroke during molten steel flow control. An auxiliary plate-exchanging means 20 including slide axes 21, 22 moving in the same direction as a hydraulic cylinder 19 operates, and an arm 24 having a proximal end 24a placed around the slide axis 21, the means 20 fixed on the upside frame 18, wherein a first engagement pin 26 mounted on the proximal end 24a of the arm 24 is inserted in a first engagement groove 25 formed in a first engagement member 23 engaging with the slide axis 21, and second engagement pins 28 mounted on bearings 29 are inserted in second engagement grooves 27 formed in the slide axes 21, 22. According to movement of the slide axes 21, 22, the engagement pins 26, 28 respectively move in the engagement grooves 25, 27, thereby rotating the slide axes 21, 22 and the arm 24.
Krosaki Harima Corporation | Date: 2011-01-12
A method of controlling a sliding nozzle device 10 and a plate 13 used therefor, even if operational conditions are changed, automatically optimizing sliding conditions of the device 10, increasing a life of the plate 13, and reducing a corrosion rate and a stroke length of the plate 13. When the device 10 is controlled, if an average cumulative sliding rate of the plate 13 is outside a control range, a sliding rate of the plate 13 is changed within a preset range, thereby automatically optimizing the sliding conditions of the device 10 even with an operational condition change. Also, 3% to 20% of average sliding rate can reduce the corrosion rate of the plate 13 and drastically increase the life of the plate 13.
Krosaki Harima Corporation | Date: 2014-01-21
foundry machines; grinding machines for the treatment of ceramics; milling machines for the treatment of ceramics; turning machines for the treatment of ceramics; lapping machines for the treatment of ceramics; polishing machines for the treatment of ceramics; cutting machines for the treatment of ceramics; metal working machines; grinding machines for the treatment of metal; milling machines for the treatment of metal; machines for manufacturing glassware; machines for manufacturing glass working; machine tools for forming, riveting, swaging, and flaring of metal and plastics; machines for plastics working; scales, encoders, gauge blocks, hole plates, reference standards, calibration standards, straight edge ruler, optical flat and mirrors of ceramic for semiconductor manufacturing machines sold as an integral part of semiconductor manufacturing machines; machines for manufacturing semiconductors; IC handlers, namely, machines for processing integrated circuits; machines for stone working; refractory materials gunning machines. Casting nozzles for furnaces; sliding nozzles for furnaces; nozzles for furnaces; sliding nozzle accessories for furnaces; casting nozzle exchangers for furnaces; alumina, magnesia, clayey, graphite, zircon and zirconia tundish for furnaces; coolers for furnaces; shaped fittings of metal and non-metal for furnaces and ovens and oven fittings made of fireclay, all sold as integral components of furnaces and ovens; structural plates for ovens; furnaces; non-metal porous plugs for furnaces for blowing gas into steel ladles or steel refining vessels, sold as an integral component of furnaces. Refractory materials, not of metal, for casting nozzles; refractory materials, not of metal, for sliding nozzles; refractory materials, not of metal, for tundish; refractory bricks, not of metal; bricks; refractory construction materials, not of metal; cement for furnaces; earth for bricks; binding agents for making stones.
Krosaki Harima Corporation | Date: 2012-10-09
Grinding machines for the treatment of ceramics; milling machines for the treatment of ceramics; turning machines for the treatment of ceramics; lapping machines for the treatment of ceramics; polishing machines for the treatment of ceramics; cutting machines for the treatment of ceramics; metal working machines; grinding machines for the treatment of metal; milling machines for the treatment of metal; machines for manufacturing glassware; machines for manufacturing glass works; machine tools for forming, riveting, swaging, and flaring of metal and plastics; machines for plastics working; machine parts for semiconductor manufacturing machines, namely, scales, encoders, gauge blocks, hole plates, reference standards, calibration standards, straight edge ruler, optical flat and mirrors of ceramic; machines for manufacturing semiconductors; IC handlers, namely, machines for processing integrated circuits; machines for stone working.