Kobe Steel, Ltd.

Kabushiki Kaisha Kobe Seiko Sho

Japan Atomic Energy Agency

Kobelco Research Institute, Inc.

Ichiro Tsukatani

Masatoshi Sudo

Jumpei Nakayama

Kiyoshi Kiuchi

Ikuo Ioka

Hiromi Hori

Zenichi Shibata

Chiaki Kato

Nobutoshi Maruyama

Makoto Tanabe

Tsuguaki Oki

Hiromori Tsutsumi

Koji Hosomi

Teruyuki Takahara

Disclosed is an austenitic welding material which contains C: 0.01 wt % or less, Si: 0.5 wt % or less, Mn: 0.5 wt % or less, P: 0.005 wt % or less, S: 0.005 wt % or less, Ni: 15 to 40 wt %, Cr: 20 to 30 wt %, N: 0.01 wt % or less, O: 0.01 wt % or less, and the balance of Fe and inevitable impurities, wherein the content of B contained as one of the inevitable impurities in the welding material is 3 wt ppm or less, and the total content of C, P, S, N and O in the welding material is 0.02 wt % or less.

Austenitic welding material, and preventive maintenance method for stress corrosion cracking and preventive maintenance method for intergranular corrosion, using same

A cold-rolled high strength steel plate with excellent formability and baking hardenability, has the composition (% by weight) 0.2-0.15% of C, 0.02-0.7% of Mn, 0.01-0.1% of Al and 0.002-0.01% of N, optionally at least one element selected from the group consisting of 0.01-0.8% of Si, 0.01-0.1% of P, 0.0002-0.005% of B and 0.01-0.5% of V, and a microstructure comprising ferrite containing 2-30% of bainite and less than 8% of martensite. The steel plate is produced by hot and cold rolling steel of the defined composition followed by rapidly heating to a temperature between the Ac.sub.1 and Ac.sub.3 transformation points, holding at this temperature for less than 5 minutes, and quenching to a temperature below 500.degree. C. at a cooling rate between 50.degree. and 500.degree. C./sec.

Cold-rolled high strength steel plate with composite steel structure of

The present invention discloses a cold-rolled ultra low carbon steel sheet with improved press-forming properties, which comprises 0.002-0.015% of C, less than 0.006% of N, less than 0.01% of O, less than 0.02% of S, 0.1-0.35% of Mn, 0.01-0.06% of acid-soluble Al, 0.02-0.15% of Ti, and 0.05-0.4% of Cr, and has a value less than 0.8 for the atomic ratio (Ti*/(C+N)) of the total titanium content except titanium of oxide form (Ti*) to the sum of carbon and nitrogen contents, with the balance Fe and incidental impurities. This steel has sufficient values of yield and tensile strengths; is excellent in various properties such as elongation, work hardening index, r value, aging index and Erichsen value; and shows good press-forming properties without any special overaging treatment.

Cold-rolled ultra low carbon steel sheet with improved press-forming

Maraging-steel cylinders for uranium enriching centrifugal separators are made by drawing a blank of maraging-steel into a cylindrical shape, squeezing the drawn blank, and subjecting the squeezed cylinder to aging.

Process for producing maraging-steel cylinder for uranium enriching

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Kobe, Japan

Ichiro Tsukatani