C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
148/34.1
C21D 8/08 (2006.01) C21D 1/19 (2006.01) C21D 1/30 (2006.01)
Patent
CA 1317859
ABSTRACT A method for producing rolled steel products, for example threadable prestressing steels, comprises subjecting steels having a C-content of 0.50 to 0.80% by weight, a Si-content of 0.20 to 0.60% by weight, and an Mn-content of 0.30 to 0.80% by weight, after hot-rolling, from the roll heat on the outlet side of the finishing stand, by cooling, to surface quenching such that the material in one edge zone is converted directed and completely into martensite, whereas the heat content remaining in the core zone causes, during subsequent cooling, annealing of the martensitic edge zone not beyond the range of the intermediate stage, and in which cooling is followed by cold working, for example stretching, and this is followed by annealing; stretching preferably amounts to between 0.5 and 1.5%; annealing is preferably carried out at a temperature most preferably between 350 and 380°C and during a period of residence of 5 to 60 seconds at maximal temperature; this method makes it possible to produce, simply and economically, rolled steel products, for example prestressing steels, which fully meet the the demands of construction work as regards deforma- bility and mechanical properties.
547400
Richartz Erich
Russwurm Dieter
Aicher Max
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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