Nippon Steel Corporation

Nippon Steel Sumitomo Metal Corporation

Aisin Aw Industries Co., Ltd.

Furukawa-sky Aluminum Corporation

Aisin Fukui Corporation

Ken Takata

Kazuo Hikida

Naruhiko Nomura

Hiroshi Fukuchi

Akihiro Seki

Nobuyuki Naito

Yoichi Jinza

Kengo Takeda

Motonori Hashimoto

Toshio Komatsubara

Tsutomu Tagata

Koji Ichitani

A cooling method for a workpiece includes placing entirety of the workpiece in an inner space of a recess provided on a molding surface of a lower mold, pressing or restraining the workpiece by a mold including the lower mold and an upper mold in which a protrusion corresponding to the recess of the lower mold is provided on a molding surface, supplying a liquid coolant to the inner space of the recess through a coolant supply passage provided in at least one of the lower mold and the upper mold by a pump, and discharging air in the inner space of the recess upward through an air escape passage, and cooling the workpiece by immersing the entirety of the workpiece, which has been heated, in the liquid coolant that fills the recess.

Cooling method for workpiece

In a mold, at least one of a lower mold and an upper mold includes a coolant supply passage through which a liquid coolant is supplied to an inner space of a recess, and the mold includes an air escape passage through which air in the inner space of the recess is discharged upward.

Mold, mold apparatus, and cooling method for workpiece

The present invention provides steel sheet excellent in cold formability and ductility after heat treatment and a method for production thereof. The steel sheet of the present invention is steel sheet which has a chemical composition containing, by mass %, C: 0.10 to 0.40%, Si: 0.30 to 1.00%, Mn: 0.30 to 1.00%, Al: 0.001 to 0.10%, P: 0.0001 to 0.02%, and S: 0.0001 to 0.01% and having a balance of Fe and impurities, which steel sheet characterized in that a ratio (B/A) of the number of carbides at the ferrite grain boundaries (B) to the number of carbides inside the ferrite grains (A) is over 1, a ferrite grain size is 5 &#x3bc;m to 50 &#x3bc;m, an average grain size of carbides is 0.4 &#x3bc;m to 2.0 &#x3bc;m, a pearlite area ratio is 6% or less, and a Vicker's hardness is 120 HV to 170 HV.

Steel sheet and method for production thereof

An aluminum alloy material for high-temperature/high-speed molding containing 2.0 to 8.0 mass % of Mg, 0.05 to 1.0 mass % of Mn, 0.01 to 0.3 mass % of Zr, 0.06 to 0.4 mass % of Si and 0.06 to 0.4 mass % of Fe, with the balance being made of aluminum and inevitable impurities; an aluminum alloy material for high-temperature/high-speed molding containing 2.0 to 8.0% of Mg, 0.05 to 1.5% of Mn and 0.05 to 0.4% of Cr, Fe being restricted to 0.4% or less and Si being restricted to 0.4% or less, the grain diameter of a Cr-base intermetallic compound formed by melt-casting being 20 &#x3bc;m or less, and grains of intermetallic compounds with a grain diameter in the range from 50 to 1,000 nm as Mn-base and Cr-base precipitates being present in a distribution density of 350,000 grains/mmor more, the aluminum alloy material being used for high-temperature/high-speed molding by subjecting the alloy material to cooling at a cooling rate of 20&#xb0; C./min or more immediately after molding at a temperature range from 200 to 550&#xb0; C. and at a strain rate from 10to 10/sec; and a method of producing the aluminum alloy material.

Aluminum alloy material for high-temperature/high-speed molding, method of producing the same, and method of producing a molded article of an aluminum alloy

Disclosed is a ferritic stainless steel for forming into bellows having high resistance to stress corrosion cracking, comprising, in terms of wt %, not greater than 0.02% of C, from 0.1 to 1.5% of Si, not greater than 1.0% of Mn, from 11.0 to 22.0% of Cr, from 0.01 to 0.08% of Al, not greater than 0.015% of N, at least one of not greater than 0.6% of Ti and not greater than 1.0% of Nb, whenever necessary, and furthermore, at least one of not greater than 2% of Mn, not greater than 1.5% of Cu and not greater than 1.5% of Ni. This steel has the crystal grain size measured in a section in a direction orthogonal to a rolling direction is not greater than 8.5 in terms of the grain size number, and the crystal grain size measured in a section orthogonal to a section parallel to the rolling direction is not smaller than 5.0 on an average in terms of the grain size number.

Ferritic stainless steel bellows

Growing community of inventors

Tokyo, Japan

Ken Takata