ST35 Seamless Pipe has an ST35 rating and follows the DIN 2391 specifications. The pipes' diameters range from 4-190mm, with... moreST35 Seamless Pipe has an ST35 rating and follows the DIN 2391 specifications. The pipes' diameters range from 4-190mm, with wall thicknesses ranging from 0.5mm to 15mm. Steel India Company is a significant producer and supplier of DIN 2391 ST35 pipes in various sizes and types. The pipes' outside dimensions range from 0.4mm to 60mm.Look for the best St35 steel pipe suppliers.The yield and tensile strengths of the product are both high.