Stainless Steel Square Pipe is made up of various stainless steel grades. The square pipes are useful in structural applications as the geometric shape provides extra strength to the pipe. Navstar Steel is a leading manufacturer and supplier of the Stainless Steel Square Pipe products in various scales and dimensions. The dimensions range according to the ASTM, ASME and API standards. The 304 stainless steel is the most used grade. So the ASTM A554 Grade Mt304 Tube is the most used of stainless steel pipes.