The r Values and Recrystallized Textures of Ti Stabilized Low C, N-17%Cr Stainless Steel Sheets

Abstract

The effect of mill processing variables on the r-value and texture of Ti-stabilized low C, N-17% Cr stainless steel has been investigated. The results obtained are as follows;
(1) The r-value in cold rolled and annealed steel sheet is very effectively improved by Ti addition of 0.2-0.3 weight percent but the excessive addition should be avoided because the recrystallization temperature is shifted to a higher range.
(2) The optimum r-value is obtained by the following conditions: Finishing temperature of hot rolling is low. Hot rolled sheet is annealed at 900°C, with a rapid heating rate and a cooling ra te as fast as air cooling. Cold reduction is more than 80% and in case of two stage cold rolling and annealing process the distribution between 1st and 2nd reduction is 40% to 60%. Finally, intermediate of final annealing temperature is 850°C.
(3) When favorable fine carbo-nitride precipitates are formed in hot rolled sheet before cold rolling by conforming the above processing conditions, these precipitates seem to develop strong {112} <110> deformation texture in high cold reduction and supress {110} <001> and develop strong {554} <225> component in the recrystallized texture, resulting in annealed products with very high r-values.