A few fundamental features of Stainless steel 321 Rectangular Pipes are that they are cost effective fitting, leak proof, high tensile strength and long service life. Buy Stainless steel 321 Square Pipe at reasonable cost from us. In order to provide optimum resistance to intergranular corrosion and to polythionic acid stress corrosion cracking in service temperatures at 1500 – 1650 Degree F an air cool may be used in this SS 321 Round Pipes. Meanwhile, this SS 321 ERW Pipe is generally considered to have comparable weldability to 304 and 304L stainless with the main difference being the titanium addition which reduces or prevents carbide precipitation during welding. This titanium addition in Stainless steel 321 EFW Pipes reduces or prevents carbide precipitation during welding and in the 800 – 1500 Degree F service conditions.