Method for direct heat treating austenitic stainless steel wire rod
AssigneeNippon Steel Corporation
InventorsJiro Tominaga, Wataru Shinada, Wataru Murata, Masahiro Ito
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Abstract
Method for direct heat treating austenitic stainless steel wire rod wherein a hot rolled austenitic stainless steel wire rod is rendered to finish the final finishing stand of a hot rolling mill at a temperature zone in the range of solution heat treatment, then the temperature zone of said solution heat treatment is so maintained that the austenitic crystal grain size is to be less than 7.0, and subsequently said wire rod is quenched to a temperature where no chromium carbide is precipitated at a cooling rate where no chromium carbide is precipitated.
Claims3
A method for directly heat treating an austenitic stainless steel wire rod which consists essentially of the steps of subjecting the wire rod to a finish hot rolling at a temperature suitable for the solution treatment of the wire rod, maintaining the wire rod from the final finish hot rolling step at a temperature within the solution treatment zone until the austenite crystal grain size number of the wire rod is in the range of 3.0 to 7.0 as determined by the JIS G0551 test, and subsequently quenching said wire rod at a rate and temperature below about 500.degree. C., so that substantially no chromium carbide precipitation takes place, thereby producing an austenitic stainless steel wire rod having good cold working properties, such that the reduction of area percentage is at least about 79%.
Dependencies are inferred from the claim text.