Stainless Steel 316 pipe and tubing is offered with either welded or seamless construction. SS 316 Pipe are known for excellent tensile & material strength. ASTM A182 Stainless Steel 316 Capillary Tubing, werkstoff nr. 1.4401 / 1.4436 Instrumentation Tubes, UNS S31600 Square Pipes & Rectangular Pipes Stainless Steel 316 Seamless Tube - Pipe Dream FittingsStainless Steel 316 Seamless Tube. Stainless Steel Tube to ASTM A269/A213 seamless. For pressure ratings on our Stainless Steel Tube please contact us. Stainless Steel Seamless Tube is kept in 6 metre random lengths for large enquiries or custom lengths please contact us on 0121 318 1743 or [email protected] Stainless Steel Pipe - Stainless Piping Supplier TW Metals stocks a wide range of industry standard sizes of both welded and seamless stainless steel pipes. Our inventories primarily consist of the austenitic grades of 304, 304L, 316, 316L, in a size range from 1/8 to 24 NPS.