Metal treatment – Compositions – Heat treating
Patent
1984-01-30
1988-03-22
Dean, R.
Metal treatment
Compositions
Heat treating
148328, C21D 714
Patent
active
047326239
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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Gross Heinz
Reith Friedrich
Retzlaff Friedhelm
Schlusnus Karl H.
Dean R.
Fogiel Max
Hoesch Werke Aktiengesellschaft
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