Duplex ferritic austenitic stainless steel composition

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United States of America Patent

PATENT NO 11932926
APP PUB NO 20170130305A1
SERIAL NO

15319454

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Abstract

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A duplex ferritic austenitic stainless steel having high formability utilizing the TRIP effect and high corrosion resistance with the high pitting resistance equivalent. The duplex stainless steel contains less than 0.04 weight % carbon, 0.2-0.8 weight % silicon, 0.3-2.0 weight % manganese, 14.0-19.0 weight % chromium, 2.0-5.0 weight % nickel, 4.0-7.0 weight % molybdenum, less than 4.5 weight % tungsten, 0.1-1.5 weight % copper, 0.14-0.23 weight % nitrogen, the rest being iron and inevitable impurities occurring in stainless steels. Further, the co-effect of the chromium, molybdenum and tungsten contents in weight % is in the range of 20<(Cr+Mo+0.5W)<23.5, where the ratio Cr/(Mo+0.5W) is in the range of 2-4.75.

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  • OUTOKUMPU OYJ

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Jonsson, Jan Y Avesta, SE 8 13
Oliver, James Fjardhundra, SE 66 587

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