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07194 Pitting Corrosion Resistance of Electropolished Seamless Stainless Steel Tubes Type En 1.4404

Picture for 07194 Pitting Corrosion Resistance of Electropolished Seamless Stainless Steel Tubes Type En 1.4404
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Product Number: 51300-07194-SG
ISBN: 07194 2007 CP
Author: Torben Steen Nielsen, Troels Mathiesen, and Jan Elkjaer Frantsen
Publication Date: 2007
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Seamless tubes type EN 1.4404 produced by hot extrusion have been internally electropolished at a mill that normally produces such tubes from welded tubes made from rolled plate. One or two standard passes have been applied. The short-range surface irregularities are removed by the electropolish, but the long-range waviness, and with that also the Ra value, remains unaffected by the electropolishing. The pitting resistance was evaluated by measurement of pitting potentials in solutions containing 500, 5000, and 50.000 mg/L chloride and temperatures from 10 to 95°C and by the ASTM G150 test. The asextruded and the once electropolished surfaces have pitting resistance very close to that observed with a rolled and pickled surface. The twice electropolished surface mostly have a much improved pitting resistance, but a few of the test results are no better than the parent material; this is discussed in terms of the number of pit initiation sites.
Seamless tubes type EN 1.4404 produced by hot extrusion have been internally electropolished at a mill that normally produces such tubes from welded tubes made from rolled plate. One or two standard passes have been applied. The short-range surface irregularities are removed by the electropolish, but the long-range waviness, and with that also the Ra value, remains unaffected by the electropolishing. The pitting resistance was evaluated by measurement of pitting potentials in solutions containing 500, 5000, and 50.000 mg/L chloride and temperatures from 10 to 95°C and by the ASTM G150 test. The asextruded and the once electropolished surfaces have pitting resistance very close to that observed with a rolled and pickled surface. The twice electropolished surface mostly have a much improved pitting resistance, but a few of the test results are no better than the parent material; this is discussed in terms of the number of pit initiation sites.
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Corrosion and stress corroson cracking (SCC) susceptibility of duplex stainless steels (DSS) depend on alloy composition, microstructure and temperature. In this study the effect of sulfide containing caustic environment and material properties (DSS composition and microstructure) on the corrosion and SCC of DSS in pulping liquors (synthetic white liquor) was evaluated.

 
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