Nippon Steel Sumitomo Metal Corporation

Sumitomo Metal Industries, Inc.

Junichi Higuchi

Hideya Kaminaka

Junko Imamura

Kiyoko Takeda

Hiroyuki Anada

Shuuji Yoshida

Yoshiaki Yamade

Kenji Hamaogi

A nickel material, which comprises by mass percent, C: 0.003 to 0.20% and one or more elements selected from Ti, Nb, V and Ta: a total content less than 1.0%, the contents of these elements satisfying the relationship specified by the formula of '(12/48) Ti+(12/93) Nb+(12/51) V+(12/181) Ta&#x2014;C&#x2267;0', with the balance being Ni and impurities, does not deteriorate in the mechanical properties and corrosion resistance even when it is used at a high temperature for a long time and/or it is affected by the heat affect on the occasion of welding. Therefore, it can be suitably used as a member for use in various chemical plants including facilities for producing caustic soda, vinyl chloride and so on. Each element symbol in the above formula represents the content by mass percent of the element concerned.

Nickel material for chemical plant

The present invention provides a duplex stainless steel having excellent resistance to alkalis and particularly corrosion resistance against high-temperature concentrated alkali solutions and excellent weldability. The duplex stainless steel has a chemical composition comprising, in mass %, C: at most 0.03%, Si: at most 0.5%, Mn: at most 2.0%, P: at most 0.04%, S: at most 0.003%, Cr: at least 25.0% to less than 28.0%, Ni: at least 6.0% to at most 10.0%, Mo: at least 0.2% to at most 3.5%, N: less than 0.5%, W: at most 3.0%, and a remainder of Fe and impurities.

Duplex stainless steel having excellent alkali resistance

A metal tube in the present invention is a metal tube for pyrolysis reaction with superior characteristics of both the heat exchange and the pyrolysis reaction, which is suitable for use in a process in which hydrocarbons are pyrolytically decomposed. The tube is a metal tube for pyrolysis reaction consisting of 3 or 4 spiral ribsprovided on an inner surface which are inclined at 20 to 35 degrees to an axial direction of the metal tube, and characterized in that h/Di of 0.1 to 0.2 and h/w of 0.25 to 1.0 when a height of the ribis defined as 'h', a width of the ribat its bottom part is defined as 'w' and an inner diameter of the tube at the bottom part is defined as &#x201c;Di&#x201d; in cross section of the spiral rib

Metal tube for pyrolysis reaction

Growing community of inventors

Nishinomiya, Japan

Junichi Higuchi