At Benkan Kiko, we manufacture welded pipe fittings made of duplex stainless steel.
The material commonly referred to as duplex stainless steel is characterized by its high resistance to corrosion and greater strength compared to austenitic stainless steel. This allows for thinner design plate thicknesses, leading to advantages such as weight reduction, downsizing due to increased flow rates, and cost reduction in piping. At Benkan Kiko, we utilize our long-established metal forming technology and quality assurance system to provide high-quality duplex stainless steel welded pipe fittings, assisting our customers with their piping design and cost reduction. Please feel free to contact us with any questions or inquiries. Project Sales Department, Eastern Japan Sales Division TEL: (03) 3777-1521 / FAX: (03) 3777-1567 Project Sales Department, Western Japan Sales Division TEL: (06) 6482-1581 / FAX: (06) 6482-1824
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basic information
Duplex is a high-strength, high-corrosion-resistant stainless steel that combines both austenitic and ferritic structures. The mixing ratio is approximately 50%:50%. It has nearly twice the strength of SUS304 and SUS316, allowing for thin-walled and lightweight piping designs. Additionally, it has strong resistance to pitting corrosion caused by seawater, superior resistance to stress corrosion cracking compared to general austenitic steels, and good pitting resistance. By adding elements such as molybdenum (Mo) and nitrogen (N) in addition to chromium and nickel, it offers a wide range of corrosion resistance and price options from lean duplex steel class to super duplex steel class. The manufacturing range accommodates pipe sizes from 1/2 inch to 80 inches, with plate thicknesses of up to approximately 50 mm. <Applicable materials> UNS No. S31803, S32750, S32506, S31260, S32205, SUS329J3L, SUS329J4L, SUS329J1, etc.
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Applications/Examples of results
It is used in a wide range of fields such as seawater heat exchangers, petrochemical plants, geothermal power plants, chemical tankers, and environmental plants.
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Company information
From residential water supply and hot water piping to massive pipelines in large-scale plants, piping that supports daily life is spread all over the world. Benkan Kiko Co., Ltd. is involved in the manufacturing of welded pipe fittings, which are essential piping components. We provide optimal products tailored to the piping environment (design, usage conditions, etc.) and construction circumstances, not only for general building water supply and hot water piping but also for power plants, gas plants, refineries, oil and chemical plants, shipbuilding, and more, where strict quality standards are required.