Sumitomo Electric Industries, Limited

Sumitomo (sei) Steel Wire Corp.

Sumitomo Steel Wire Corp.

Yukihiro Oishi

Nozomu Kawabe

Nobuyuki Mori

Ryuichi Inoue

Masatada Numano

Teruyuki Murai

Nobuyuki Okuda

Takahiko Kitamura

Koji Yamaguchi

Michimasa Miyanaga

Susumu Yamamoto

Motonori Nakamura

Atsushi Kimura

Junichi Matsumoto

Masayuki Nishizawa

Takeshi Uchihara

Masatoshi Majima

Shinji Inazawa

Shoichiro Sakai

Koji Mori

Osamu Mizuno

Kohji Inokuchi

Masaaki Fujii

Masahiko Ito

Miyanaga Michimasa

Uchihara Takeshi

Eisuke Hiro

There are provided a magnesium alloy coil stock having good flatness and a method for producing the magnesium alloy coil stock, and a magnesium alloy structural member that uses the coil stock and a method for producing the magnesium alloy structural member. The coil stock is obtained by coiling a sheet composed of a magnesium alloy in a cylindrical shape, and the internal diameter of the coil stock is 1000 mm or less. The coil stock can be produced by rolling a cast material obtained by subjecting a magnesium alloy to continuous casting, subjecting the rolled sheet to warm leveling, and coiling the worked sheet in a cylindrical shape while the temperature just before coiling is decreased to 100&#xb0; C. or less.

Magnesium alloy coil stock

There are provided a method for producing a magnesium alloy sheet having good press formability and a magnesium alloy coil stock obtained by coiling the magnesium alloy sheet. After a raw material sheetcomposed of a magnesium alloy is preheated to 280&#xb0; C. or less, the heated raw material sheetis rolled with a reduction rolland the obtained long rolled sheet is coiled. The surface temperature of the reduction rollis set to be 230&#xb0; C. or more and 290&#xb0; C. or less. The preheating, rolling, and coiling are repeatedly performed in a continuous manner. By setting both the temperatures of the raw material sheetand reduction rollto be certain temperatures, the rolling property of the raw material sheet can be improved and the raw material sheet can be properly rolled in a continuous manner. In addition, a variation in temperature in the width direction of the reduction roll can be suppressed and uniform rolling can be performed, resulting in the production of a long magnesium alloy sheet. In this magnesium alloy sheet, working strain is sufficiently introduced by rolling and an increase in the size of crystal grains is suppressed. Thus, the magnesium alloy sheet has good press formability. Furthermore, a coil stock in which telescoping is not easily caused and that has good appearance is obtained.

Method for producing magnesium alloy sheet and magnesium alloy coil stock

Provided are a rolled Mg alloy material whose mechanical properties are locally different in a width direction, a Mg alloy structural member produced by plastically working the rolled Mg alloy material, and a method for producing the rolled Mg alloy material. The method for producing a rolled Mg alloy material includes rolling a Mg alloy material with a reduction roll. The reduction roll has three or more regions in the width direction. The temperature is controlled in each of the regions so that a difference between a maximum temperature and a minimum temperature exceeds 10&#xb0; C. in the width direction of a surface of the reduction roll. The rolled state in the width direction is varied by varying a difference in temperature over the width direction of the reduction roll. As a result, it is possible to produce a rolled Mg alloy material whose mechanical properties are locally different in the width direction.

Rolled magnesium alloy material, magnesium alloy structural member, and method for producing rolled magnesium alloy material

The invention offers a magnesium alloy sheet having excellent warm plastic formability, a production method thereof, and a formed body produced by performing warm plastic forming on this sheet. The magnesium alloy sheet is produced by giving a predetermined strain to a rolled sheet RS that is not subjected to a heat treatment aiming at recrystallization. The sheet is not subjected to the foregoing heat treatment even after the giving of a strain. The strain is given through the process described below. A rolled sheet RS is heated in a heating furnace. The heated rolled sheet RS is passed between rollersto give bending to the rolled sheet RS. The giving of a strain is performed such that the strain-given sheet has a half peak width of 0.20 deg or more and 0.59 deg or less in a (0004) diffraction peak in monochromatic X-ray diffraction. The alloy sheet exhibits high plastic deformability by forming continuous recrystallization during warm plastic forming through the use of the remaining strain.

Magnesium alloy sheet

A magnesium alloy sheet having good press formability, a magnesium alloy structural member produced by pressing the sheet, and a method for producing a magnesium alloy sheet are provided. The magnesium alloy sheet is composed of a magnesium alloy containing Al and Mn. When a region from a surface of the alloy sheet to 30% of the thickness of the alloy sheet in a thickness direction of the magnesium alloy sheet is defined as a surface region and when a 200 &#x3bc;msub-region is arbitrarily selected from this surface region, the number precipitated impurity grains containing both Al and Mg and having a maximum diameter of 0.5 to 5 &#x3bc;m is 5 or less. When a 50 &#x3bc;msub-region is arbitrarily selected from the surface region, the number of crystallized impurity grains containing both Al and Mn and having a maximum diameter of 0.1 to 1 &#x3bc;m is 15 or less. In the grains of the crystallized phases, the mass ratio Al/Mn of Al to Mn is 2 to 5. The magnesium alloy sheet has good press formability since the crystallized phases and precipitates that cause breaking are small in amounts contained and in size.

Provided is a composite material suitable for forming a part for continuous casting capable of producing cast materials of excellent surface quality for a long period of time and with which a molten metal is inhibited from flowing into a gap between a nozzle and a moving mold. A composite material (nozzle) includes a porous bodyhaving a large number of pores and a filler incorporated in at least part of a portion that comes into contact with the molten metal, the portion being part of a surface portion of the porous body. The filler incorporated in the porous bodyis at least one selected from a nitride, a carbide, and carbon.

Composite material, part for continuous casting, continuous casting nozzle, continuous casting method, cast material, and magnesium alloy cast coil material

A coil material capable of contributing to an improvement of the productivity of a high-strength magnesium alloy sheet and a method for manufacturing the coil material are provided. Regarding the method for manufacturing a coil material through coiling of a sheet material formed from a metal into the shape of a cylinder, so as to produce the coil material, the sheet material is a cast material of a magnesium alloy discharged from a continuous casting machine and the thickness t (mm) thereof is 7 mm or less. The sheet materialis coiled with a coiler while the temperature T (&#xb0; C.) of the sheet materialjust before coiling is controlled to be a temperature at which the surface strain ((t/R)&#xd7;100) represented by the thickness t and the bending radius R (mm) of the sheet materialbecomes less than or equal to the elongation at room temperature of the sheet material

Coil material and method for manufacturing the same

The magnesium alloy sheet disclosed herein has dispersed therein particles of an intermetallic compound containing an additive element (e.g., Al) and Mg (a typical example of which is MgAl), and the ratio obtained by dividing the diffraction intensity of the main diffraction plane (4,1,1) of the intermetallic compound by the diffraction intensity of the c plane (0,0,2) of the Mg alloy phase in an XRD analysis of the surface of the sheet is 0.040 or more. The method includes: a casting step of producing a cast material composed of a magnesium alloy containing an additive element by continuous casting; a heat treatment step of holding the cast material at 400&#xb0; C. or higher and then cooling the cast material at a cooling rate of 30&#xb0; C/min or less to produce a heat-treated material; and a rolling step of subjecting the heat-treated material to warm rolling to produce a rolled sheet.

Magnesium alloy sheet and method for producing same

It is an object of the invention to provide a magnesium welding wire excellent in surface cleanliness and a method for manufacturing the same. A welding wire according to the invention can be manufactured by drawing a base material such as an extruded material made of pure magnesium or a magnesium-based alloy and, after then, by shaving the surface of the thus drawn wire. Execution of the shaving operation makes it possible not only to effectively remove a lubricant and a coating used in the drawing operation but also to effectively remove an oxide generated during the drawing operation. Thanks to this, the thus obtained welding wire is excellent in surface cleanliness. As a lubricant to be used in the drawing operation, preferably, there may be used an oil lubricant or a wet-type lubricant which can be removed easily by a cleaning operation or by a grease removing treatment.

Magnesium welding wire

The invention offers a magnesium alloy sheet material having excellent plastic processibility and rigidity and a magnesium alloy formed body having excellent rigidity. The sheet material has magnesium alloy that forms the matrix containing hard particles. The region from the surface of the sheet material to a position away from the surface by 40% of the thickness of the sheet material is defined as the surface region, and the remaining region as the center region. Hard particles existing in the center region have a maximum diameter of more than 20 &#x3bc;m and less than 50 &#x3bc;m, and hard particles existing in the surface region have a maximum diameter of 20 &#x3bc;m or less. Because the hard particles existing at the surface side are fine particles, they are less likely to become the starting point of cracking or another defect at the time of plastic processing. Because the hard particles existing in the center region are coarse, they can increase the rigidity of the sheet material.

Magnesium alloy sheet material

The method of producing a magnesium alloy joined part has the following steps: a joining step of joining a reinforcing material made of metal to a plate material made of magnesium alloy without allowing an organic material to remain at the joined portion and a plastic-working step of performing plastic working on the plate material to which the reinforcing material is joined. A desirable means of joining the reinforcing material to the plate material can be to use an inorganic adhesive. Because the magnesium alloy joined part is formed by a structure in which the reinforcing material is joined to the plate material, in comparison with the case where the reinforcing material is formed by machining or the like, the magnesium alloy structural member can be obtained with high production efficiency.

Magnesium alloy joined part and production method thereof

Magnesium-based alloy wire excelling in strength and toughness, its method of manufacture, and springs in which the magnesium-based alloy wire is utilized are made available. The magnesium-based alloy wire contains, in mass %, 0.1 to 12.0% Al, and 0.1 to 1.0% Mn, and is provided with the following constitution. Diameter d that is 0.1 mm or more and 10.0 mm or less; length L that is 1000d or more; tensile strength that is 250 MPa or more; necking-down rate that is 15% or more; and elongation that is 6% or more. Such wire is produced by draw-forming it at a working temperature of 50&#xb0; C. or more, and by heating it to a temperature of 100&#xb0; C. or more and 300&#xb0; C. or less after the drawing process has been performed.

Magnesium-based alloy wire and method of its manufacture

A magnesium alloy member having mechanical properties and corrosion resistance and a method of manufacturing the magnesium alloy member are provided. A magnesium alloy member has a base material made of a magnesium alloy, and an anticorrosive film formed on the base material. The base material is a rolled magnesium alloy including 5 to 11% by mass of Al. By using a base material including a large amount of Al, a magnesium alloy member having excellent mechanical properties and high corrosion resistance can be produced. In addition, by using a rolled material, the number of surface defects at the time of casting is small, and the frequency of compensation processes such as undercoating and puttying can be reduced.

Magnesium alloy member and method of manufacturing the same

Magnesium-based alloy wire excelling in strength and toughness, its method of manufacture, and springs in which the magnesium-based alloy wire is utilized are made available. The magnesium-based alloy wire contains, in mass %, 0.1 to 12.0% Al, and 0.1 to 1.0% Mn, and is provided with the following constitution. Diameter d that is 0.1 mm or more and 10.0 mm or less; length L that is 1000 d or more; tensile strength that is 250 MPa or more; necking-down rate that is 15% or more; and elongation that is 6% or more. Such wire is produced by draw-forming it at a working temperature of 50&#xb0; C. or more, and by heating it to a temperature of 100&#xb0; C. or more and 300&#xb0; C. or less after the drawing process has been performed.

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Osaka, Japan

Yukihiro Oishi