Worked low-temperature tough ferritic steel
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United States of America Patent
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Aug 18, 1987
Grant Date -
N/A
app pub date -
Aug 30, 1985
filing date -
Sep 3, 1984
priority date (Note) -
Expired
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Abstract
The invention concerns a method for manufacturing a worked weldable, low temperature ferritic steel consisting of 0.015 to 0.08% C 0.1 to 0.5% Si 0.3 to 0.6% Mn <0.015% P <0.015% S 4 to 7% Ni 0 to 1.5% Cu the rest iron and unavoidable impurities in normal amounts which is characterized in that the steel has added to it 0.15 to 0.25% vanadian and 0.020 to 0.030% nitrogen; the steel being rolled and then cooled to room temperature and finally subjected to a one time normalizing. Such a steel is usable as work material for making construction part especially for the transport and storage of liquified natural gas and having at a temperature of -196.degree. C. a notch charpy impact value at longitudinal test samples of more than 42 J.
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