HIGH STRENGTH STEEL PROFILE AND METHOD OF MAKING THE SAME

Canada

PATENT NO 1125150
SERIAL NO

342651

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HIGH STRENGTH STEEL PROFILE AND METHOD OF MAKING THE SAME Improved steel profiles having superior material characteristics are obtained by rolling a precipitationhardenable fine-grain steel, cooling it from a final rolling temperature above the A1-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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