Material selection for solid sodium hydroxide dissolution tanks

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I recently worked on a project that involved dissolving solid sodium hydroxide to create a 30% solution, which was then stored in tanks for future use. There are three questions below; feel free to discuss them. Thank you. 1. Since the dissolution of sodium hydroxide is an exothermic reaction, the designed dissolution tank is a stirrer tank equipped with a cooling coil inside and a cooling jacket outside. I’m not entirely sure about the material choice; I used 304 stainless steel, but I’m not sure if that’s the right material. In the past, carbon steel was used for liquid sodium hydroxide with a concentration of less than 10%, and there were no problems. 2. Additionally, I would like to ask where to find the criteria for material selection; this is a project abroad, and the client requires that GB standards not be used. If anyone has standards, please provide the standard number and the basis for selecting the materials. 3. Who among manufacturers can break open bags of solid sodium hydroxide? Please recommend them to me via private message; caustic soda is packaged in ton bags. The material feeding method is planned to be done using chain conveyors; any better recommendations are welcome.