The demand for stainless steel in the pulp industry is increasing, especially in highly corrosive environments. Since the SP method using sulfite when distilling pulp raw materials was used at that time,

 in addition to the bleaching process, stainless steel was also used in the digestion process. In particular, the 06Cr17Ni12Mo2 (316) series and 06Cr19Ni13Mo3 (317) series stainless steel,

 in recent years due to the use of alkali distillation (KP method) corrosion has weakened, the stainless steel body used in the digestion kettle is changed from 06Cr17Ni12Mo2 (316) 

and 06Cr19Ni13Mo3 (317) It is 06Cr19Ni10(304) or 022Cr19Ni10(304L). However, 06Cr19Ni13Mo3(317) is still needed in the bleaching process.