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Yokohama, Japan

JFE Holdings, Inc. is a corporation headquartered in Tokyo, Japan. It was formed in 2002 by the merger of NKK and Kawasaki Steel Corporation . At the time, NKK Corporation was Japan's second largest steelmaker and Kawasaki Steel was the third largest steelmaker.Both companies were major military vessel manufacturers during World War II.JFE's main business is steel production. It also engages in engineering, ship building, real-estate redevelopment, and LSi business. The company also operates several overseas subsidiaries, including California Steel in the United States, Fujian Sino-Japan Metal in China, and Minas da Serra Geral in Brazil. Other than steel, they are also known for products such as the bicycle tree.JFE Holdings is the fifth largest Steel maker in the world with revenue in excess of US$30 billion. JFE Holdings has several subsidiaries including JFE Engineering, JFE Steel and JFE Shoji.NKK and Siderca S.A. of Argentina established a seamless pipe joint venture by spinning off the seamless pipe division of NKK's Keihin Works in 2000. In November 2009, JFE agreed to partner with JSW Steel, India's third-largest steel producer, to construct a joint steel plant in West Bengal.Its shipbuilding unit, Universal Shipbuilding was created in 2002 when NKK Corporation a predecessor of JFE, merged its shipbuilding unit with that of Hitachi Zosen. In 2012, JFE merged its ship building unit, Universal Shipbuilding Corporation, with Marine United Inc. of IHI after discussion started in April 2008 to form Japan Marine United Corporation It would be Japan’s largest shipbuilder. Wikipedia.


Kijima H.,Jfe Holdings
Journal of Materials Processing Technology | Year: 2014

Skin-pass rolling (or temper rolling) is usually the final process in the production of cold-rolled steel sheets. One of the main objectives in skin-pass rolling is to obtain a certain surface roughness profile. Although a large roll radius compared to the contact length and the reduction in thickness is one of the characteristics of skin-pass rolling conditions, numerous studies have been conducted thus far using laboratory mills with small radius rolls. In this paper, the influence of roll radius on roughness transfer in skin-pass rolling is investigated by experimental rolling tests as well as numerical analysis by elastic-plastic FEM. A simple but useful method of estimating roughness transfer is suggested. It was found that some characteristics of skin-pass rolling related to roughened rolls are not properly simulated using small radius rolls. © 2014 Elsevier B.V. Source


Patent
Jfe Holdings | Date: 2015-04-07

A hot-pressed member includes a steel sheet, a Ni-diffusion region present in a surface layer of the steel sheet, and an intermetallic compound layer and a ZnO layer which are provided in order on the Ni-diffusion region, the intermetallic compound layer corresponding to a phase present in a phase equilibrium diagram of a ZnNi alloy, wherein a spontaneous immersion potential indicated in a 0.5 M NaCl aqueous air-saturated solution at 25 C.5 C. is 600 to 360 mV based on a standard hydrogen electrode.


A closed structure part includes a body having a predetermined closed section formed by pressing a blank of a metal plate; and a latch flange portion formed by bending one of two joint ends of the body so that the joint end overlaps an outer surface of the other joint end and latches the other joint end, wherein the joint end and the other joint end overlap in contact and are respectively disposed in singular and continuous planes.


A method for producing a non-graphitizable carbon material includes providing a raw material of a non-graphitizable carbon material. The raw material is cross-linked to obtain a cross-linked product. The cross-linked product is infusibilized to obtain an infusibilized product. The infusibilized product is baked to obtain the non-graphitizable carbon material. A mechanochemical treatment is performed on the cross-linked product or the infusibilized product.


In a finish heat treatment method and finish heat treatment apparatus for an iron powder, a raw iron powder is placed on a continuous moving hearth and continuously charged into the apparatus. In the pretreatment zone, the raw iron powder is subjected to a pretreatment of heating the raw iron powder in an atmosphere of hydrogen gas and/or inert gas at 450 to 1100 C. In decarburization, deoxidation, and denitrification zones, the pretreated iron powder is subsequently subjected to at least two treatments of decarburization, deoxidation, and denitrification. In the pretreatment zone, a hydrogen gas and/or an inert gas serving as a pretreatment ambient gas is introduced separately from an ambient gas used in the at least two treatments is introduced from the upstream side of the pretreatment zone and released from the downstream side so as to flow in the same direction as a moving direction of the moving hearth.

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