Niobium-containing weldable structural steel having good weldability
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United States of America Patent
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-
Jul 1, 1980
Grant Date -
N/A
app pub date -
Mar 8, 1978
filing date -
Oct 18, 1977
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Disclosed herein is a niobium-containing weldable structural steel having good weldability which consists of 0.005-0.04% of C, 0.01-0.50% of Si, 1.20-2.50% of Mn, 0.01-0.07% of Nb, 0.005-0.030% of Ti, 0.005-0.06% of Al and the balance of iron and inevitable impurities whereby [C(%)+1ON(%)] is not greater than 0.10% and Ti(%)/[C(%)+1ON(%)] is from 0.05 to 0.60 in order to restrict the amount of martensite islands in the weld heat affected zone to not greater than 15% in terms of the area fraction.
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