| 摘要 |
<p>The present invention provides a Ti-containing ferritic stainless steel sheet and a manufacturing method thereof, the stainless steel being formed while a refining load is decreased and having a low yield strength which exhibits superior workability. <??>Specifically, the Ti-containing ferritic stainless steel sheet contains on mass percent basis: 0.01% or less of C; 0.5% or less of Si; 0.3% or less of Mn; 0.01% to 0.04% of P; 0.01% or less of S; 8% to 30% of Cr; 1.0% or less of Al; 0.05% to 0. 5% of Ti; 0.04% or less of N, 8≤Ti/(C+N)≤30 being satisfied; and the balance being substantially Fe and incidental impurities , wherein a grain size number of ferrite grain is 6.0 or more, and an average diameter Dp of precipitation diameters, each being Ä(a long axis length of a Ti base precipitate + a short axis length thereof)/2Ü, of the Ti base precipitates in the steel sheet is in the range of from 0.05 mu m to 1.0 mu m. In addition, the method for manufacturing a Ti-containing ferritic stainless steel sheet includes the steps of: hot-rolling a slab having the composition described above, and performing recrystallization annealing of the hot-rolled steel sheet at a temperature of (a precipitation nose temperature of Ti base precipitates +/- 50 DEG C) so that an average diameter Dp of precipitation diameters, each being Ä(a long axis length of a Ti base precipitate + a short axis length thereof)/2Ü, of the Ti base precipitates is in the range of from 0.05 mu m to 1.0 mu m and so that a grain size number of ferrite grain is 6.0 or more. The method for manufacturing a Ti-containing ferritic stainless steel sheet, further includes the steps of: performing cold rolling; and subsequently performing final annealing of the cold-rolled steel sheet at a temperature less than (a precipitation nose temperature of Ti base precipitates + 100 DEG C) so that the average diameter Dp of precipitation diameters, each being Ä(a long axis length of a Ti base precipitate + a short axis length thereof)/2Ü, of the Ti base precipitates is in the range of from 0.05 mu m to 1.0 mu m and so that the grain size number of ferrite grain is 6.0 or more. <IMAGE></p> |
