Stainless steel sheet and method of manufacturing same, edged tool, and cutlery

Abstract

Provided is a stainless steel sheet having a predetermined chemical composition, in which a total volume fraction of Cr-based carbides with a grain size of 2.0 μm or more is 10% or less.

1 . A stainless steel sheet comprising a chemical composition containing, in mass %,
 C: 0.45% or more and 0.60% or less,   Si: 0.05% or more and 1.00% or less,   Mn: 0.05% or more and 1.00% or less,   P: 0.05% or less,   S: 0.020% or less,   Cr: 13.0% or more and less than 16.0%,   Ni: 0.10% or more and 1.00% or less, and   N: 0.010% or more and 0.200% or less   
       with the balance being Fe and inevitable impurities,
 wherein a total volume fraction of Cr-based carbides with a grain size of 2.0 μm or more is 10% or less. 
 
     
     
         2 . The stainless steel sheet according to  claim 1 , wherein the chemical composition further contains, in mass %, at least one selected from the group consisting of
 Mo: 0.05% or more and 1.00% or less,   Cu: 0.05% or more and 1.00% or less, and   Co: 0.05% or more and 0.50% or less.   
     
     
         3 . The stainless steel sheet according to  claim 1 , wherein the chemical composition further contains, in mass %, at least one selected from the group consisting of
 Al: 0.001% or more and 0.100% or less,   Ti: 0.01% or more and 0.10% or less   Nb: 0.01% or more and 0.10% or less,   V: 0.05% more and 0.50% or less,   Zr: 0.01% or more and 0.10% or less,   Mg: 0.0002% or more and 0.0050% or less,   B: 0.0002% or more and 0.0050% or less,   Ca: 0.0003% or more and 0.0030% or less, and   REM: 0.01% or more and 0.10% or less.   
     
     
         4 . A method of manufacturing the stainless steel according to  claim 1 , the method comprising:
 a first step in which a steel slab having the chemical composition according to  claim 1  is held at 1200° C. or higher and 1350° C. or lower for at least 30 minutes,   a second step in which the steel slab is hot rolled to obtain a hot-rolled steel sheet and the hot-rolled steel sheet is coiled, and   a third step in which the hot-rolled steel sheet is subjected to hot-rolled sheet annealing to obtain a hot-rolled and annealed steel sheet   wherein in hot rolling of the second step, at least three rolling passes with a finish temperature of 1050° C. or higher and a rolling reduction of 20% or more are performed, and a coiling temperature of the hot-rolled steel sheet is 600° C. or higher,   and in the hot-rolled sheet annealing of the third step, a holding temperature is 750° C. or higher and 900° C. or lower and a holding time is 10 minutes or more.   
     
     
         5 - 10 . (canceled) 
     
     
         11 . The stainless steel sheet according to  claim 2 , wherein the chemical composition further contains, in mass %, at least one selected from the group consisting of
 Al: 0.001% or more and 0.100% or less,   Ti: 0.01% or more and 0.10% or less   Nb: 0.01% or more and 0.10% or less,   V: 0.05% more and 0.50% or less,   Zr: 0.01% or more and 0.10% or less,   Mg: 0.0002% or more and 0.0050% or less,   B: 0.0002% or more and 0.0050% or less,   Ca: 0.0003% or more and 0.0030% or less, and   REM: 0.01% or more and 0.10% or less.   
     
     
         12 . A method of manufacturing the stainless steel according to claim  2 , the method comprising:
 a first step in which a steel slab having the chemical composition according to  claim 2  is held at 1200° C. or higher and 1350° C. or lower for at least 30 minutes,   a second step in which the steel slab is hot rolled to obtain a hot-rolled steel sheet and the hot-rolled steel sheet is coiled, and   a third step in which the hot-rolled steel sheet is subjected to hot-rolled sheet annealing to obtain a hot-rolled and annealed steel sheet   wherein in hot rolling of the second step, at least three rolling passes with a finish temperature of 1050° C. or higher and a rolling reduction of 20% or more are performed, and a coiling temperature of the hot-rolled steel sheet is 600° C. or higher,   and in the hot-rolled sheet annealing of the third step, a holding temperature is 750° C. or higher and 900° C. or lower and a holding time is 10 minutes or more.   
     
     
         13 . A method of manufacturing the stainless steel according to  claim 3 , the method comprising:
 a first step in which a steel slab having the chemical composition according to  claim 3  is held at 1200° C. or higher and 1350° C. or lower for at least 30 minutes,   a second step in which the steel slab is hot rolled to obtain a hot-rolled steel sheet and the hot-rolled steel sheet is coiled, and   a third step in which the hot-rolled steel sheet is subjected to hot-rolled sheet annealing to obtain a hot-rolled and annealed steel sheet   wherein in hot rolling of the second step, at least three rolling passes with a finish temperature of 1050° C. or higher and a rolling reduction of 20% or more are performed, and a coiling temperature of the hot-rolled steel sheet is 600° C. or higher,   and in the hot-rolled sheet annealing of the third step, a holding temperature is 750° C. or higher and 900° C. or lower and a holding time is 10 minutes or more.   
     
     
         14 . A method of manufacturing the stainless steel according to  claim 11 , the method comprising:
 a first step in which a steel slab having the chemical composition according to  claim 11  is held at 1200° C. or higher and 1350° C. or lower for at least 30 minutes,   a second step in which the steel slab is hot rolled to obtain a hot-rolled steel sheet and the hot-rolled steel sheet is coiled, and   a third step in which the hot-rolled steel sheet is subjected to hot-rolled sheet annealing to obtain a hot-rolled and annealed steel sheet   wherein in hot rolling of the second step, at least three rolling passes with a finish temperature of 1050° C. or higher and a rolling reduction of 20% or more are performed, and a coiling temperature of the hot-rolled steel sheet is 600° C. or higher,   and in the hot-rolled sheet annealing of the third step, a holding temperature is 750° C. or higher and 900° C. or lower and a holding time is 10 minutes or more.   
     
     
         15 . The method of manufacturing the stainless steel sheet according to  claim 14 , comprising the fourth step in which the hot-rolled and annealed steel sheet is cold rolled to obtain a cold-rolled steel sheet. 
     
     
         16 . The method of manufacturing the stainless steel sheet according to  claim 15 , comprising the fifth step in which the cold-rolled steel sheet is subjected to cold-rolled sheet annealing to obtain a cold-rolled and annealed steel sheet
 wherein in the cold-rolled sheet annealing, a holding temperature is 700° C. or higher and 850° C. or lower and a holding time is 5 seconds or more.   
     
     
         17 . The method of manufacturing the stainless steel sheet according to  claim 14 , comprising the sixth step in which the hot-rolled and annealed steel sheet is subjected to quenching treatment
 wherein in the quenching treatment, a holding temperature is 950° C. or higher and 1200° C. or lower, a holding time is 5 seconds or more and 30 minutes or less, and an average cooling rate after holding is 1° C./s or more.   
     
     
         18 . The method of manufacturing the stainless steel sheet according to  claim 15 , comprising the sixth step in which the cold-rolled steel sheet is subjected to quenching treatment
 wherein in the quenching treatment, a holding temperature is 950° C. or higher and 1200° C. or lower, a holding time is 5 seconds or more and 30 minutes or less, and an average cooling rate after holding is 1° C./s or more.   
     
     
         19 . The method of manufacturing the stainless steel sheet according to  claim 16 , comprising the sixth step in which the cold-rolled and annealed steel sheet is subjected to quenching treatment
 wherein in the quenching treatment, a holding temperature is 950° C. or higher and 1200° C. or lower, a holding time is 5 seconds or more and 30 minutes or less, and an average cooling rate after holding is 1° C./s or more.   
     
     
         20 . The method of manufacturing the stainless steel sheet according to  claim 17 , comprising the seventh step in which the steel sheet subjected to quenching treatment is subjected to a tempering treatment
 wherein in the tempering treatment, a holding temperature is 100° C. or higher and 800° C. or lower and a holding time is 5 minutes or more.   
     
     
         21 . The method of manufacturing the stainless steel sheet according to  claim 18 , comprising the seventh step in which the steel sheet subjected to quenching treatment is subjected to a tempering treatment
 wherein in the tempering treatment, a holding temperature is 100° C. or higher and 800° C. or lower and a holding time is 5 minutes or more.   
     
     
         22 . The method of manufacturing the stainless steel sheet according to  claim 19 , comprising the seventh step in which the steel sheet subjected to quenching treatment is subjected to a tempering treatment
 wherein in the tempering treatment, a holding temperature is 100° C. or higher and 800° C. or lower and a holding time is 5 minutes or more.   
     
     
         23 . An edged tool made of the stainless steel sheet according to  claim 11 . 
     
     
         24 . Cutlery made of the stainless steel sheet according to  claim 11 .