316 stainless steel square tube is manufactured from 316 austenitic stainless steel, with molybdenum added on the basis of 304, significantly improving resistance to pitting, crevice corrosion, and chloride corrosion. The hollow structure of square tubes achieves lightweight design while maintaining bending and torsional strength, and the 316 material provides exceptional corrosion resistance in harsh environments. This material is widely used in coastal architecture, chemical equipment frameworks, marine engineering structures, swimming pool facilities, and sewage treatment plants where corrosion resistance requirements are extremely high.