Kitakyūshū, Japan
Kitakyūshū, Japan

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Tani M.,Yawata Steel Works | Zeze M.,Yawata Steel Works | Toh T.,Mathematical Science and Technology Research Laboratory | Tsunenari K.,Plant Engineering and Facility Management Center | And 4 more authors.
Nippon Steel Technical Report | Year: 2013

In the electromagnetic casting (EMC) technique, an electromagnetic field is imposed by a solenoidal coil and a Lorentz force is generated at a meniscus. Consequently, a smooth cast surface without defects can be expected. So far concerning with EMC, the billet casting plant test, the slab casting bench scale test on pilot caster and the numerical simulation have been conducted. Finally the slab casting plant tests with the EMC technique were conducted. The castings were very stable and produced without any major difficulties. The qualities of slab cast were greatly improved by the EMC technique.


Fukuda Y.,Steelmaking Div. | Onoyama S.,Steelmaking Div. | Imai T.,Technical Administration and Planning Div. | Mukawa S.,Nagoya RandD Laboratory | And 5 more authors.
Nippon Steel Technical Report | Year: 2013

Form the beginning of 1980's, demand for high corrosion resistance steel sheet for automobile were increased. In Nagoya Works, to satisfy these demands, development was focused on the improvement of productivity of IF(Interstitial Free) steel by improving RH decarburization performance and refining cycle time to match sequential casting. Skull removing equipments system and enlargement of snorkel diameter and introduction of preevacuation system were effective counter me sears. Second issue was the development of converter type hot metal pre-treatment system, which enabled simultaneous desiliconization and dephosphorization treatment. After that, demand for mass production of low sulphur steel for high tensile strength steel for automobile elimination of weight to match CO2 reduction, separated process between desulphurization and dephosphorization, ORP II process, was developed. For anti-sour steel production, such as line pipe, RH desulphurization technology was developed for ultra low sulphur steel on mass production.


Iguchi M.,Steelmaking Div. | Yamazaki T.,Hirohara RandD Laboratory | Matsumoto K.,Steelmaking Div.
Nippon Steel Technical Report | Year: 2013

In 1993, Nippon Steel Corporation Hirohata Works commercially established a new process, called scrap melting process (SMP). The SMP utilizes steel scrap as its principal metal source to produce hot metal saving the reduction energy of iron ore. The SMP then served as the core process to recycle raw materials and fuels including waste tires. This paper outlines Hirohata's activities to recycle steelmaking dust and waste tires and the environmentally friendly technology that support these activities.


Kobayashi M.,Steelmaking Div. | Isobe K.,Muroran RandD Laboratory | Arai M.,Steelmaking Div.
Nippon Steel Technical Report | Year: 2013

Muroran Works, Nippon Steel Corporation manufactures special bars and wire rods mainly for automotive parts. In steelmaking plant, many technologies have been developed to manufacture high grade special steel and to suit the users' various needs, e.g. multi-refining converter (MURC), secondary steelmaking and casting to improve steel cleanliness, and near net casting and compact high reduction process (NCR). Authors describe recent advances and prospects in steelmaking and casting technologies for manufacturing special steel in Muroran Works.


Kusunoki S.,Steelmaking Div. | Nishihara R.,Steelmaking Div. | Kato K.,Steelmaking Div. | Sakagami H.,Steelmaking Div. | And 2 more authors.
Nippon Steel Technical Report | Year: 2013

In the early 1980s, when all of the ironmaking and steelmaking plants at Yawata Works were transferred from the Yawata area to the Tobata area, three steelmaking plants had been producing various type of steel grades, such as sheets, electrical steels, rails, shapes, pipes and stainless steels. After that, it became necessary to meet the growing demand for producing high-grade steel and to restructure the production process by reducing the number of blast furnaces. Therefore, new technologies have been actively developed and introduced to drastically improve the productivity and the steelmaking technologies. These measures enabled us to streamline the production facilities and to establish a highly-efficient steelmaking process which can offer a wide variety of high-grade steel.


Ueyama S.,Steelmaking Div. | Niizuma M.,Steelmaking Div. | Yonezawa K.,Steelmaking Div.
Nippon Steel Technical Report | Year: 2013

Nippon Steel Corporation Kimitsu Works produces heavy plate steel for line-pipes in sour gas service and for offshore structure. As these are high-performance steels, Nippon Steel Corporation has developed advanced manufacturing technology, such as desulfurization, non-metallic-inclusion control, and inner defect free technology for slab. At Kimitsu Works, the No.6 continuous slab caster was put into operation in 2006. By optimizing the conditions of the soft reduction, center segregation and porosity has been drastically reduced and high productivity has been achieved. Along with desulfurization technology and oxide metallurgy Nippon Steel Corporation developed, we have established mass production technology of high quality heavy plate.

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