Method of making high strength steel tube
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United States of America Patent
Stats
-
Nov 8, 1983
Grant Date -
N/A
app pub date -
Dec 26, 1979
filing date -
Jan 2, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Improved steel profiles having superior material characteristics are obtained by rolling a precipitation-hardenable fine-grain steel, cooling it from a final rolling temperature above the A.sub.1 -temperature down to a temperature of about 400.degree. C. in an atmosphere in which it is allowed to overage, whereupon the steel plate or strip is then cooled down to room temperature and cold-processed to form an open profile [which can thereupon be converted into a tube by welding together its longitudinally extending edges and] which is then subjected to solution-annealing in order to dissolve coarse precipitants and subsequently further cooled to form finely dispersed precipitants in the profile.
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