Suao is a professional manufacturer of high-precision cold drawn steel tubes, hydraulic tubes, and mechanical structure tubes, integrating R&D, production, inspection, and global sales. We operate two major production facilities covering over 36,000 square meters, with more than 200 employees and an annual output of 50,000+ tons, supplying customers across major industrial markets worldwide. As Suppliers of Precision Cold-Drawn SS Tube – TP304, Ø50.8 x 2mm, ASTM A269, our integrated manufacturing capabilities include cold drawing, heat treatment, straightening, finishing, cutting, chamfering, and surface treatment. These are supported by a full range of advanced equipment for non-destructive testing, chemical analysis, and online dimensional monitoring—ensuring every tube meets stringent quality standards. We invest continuously in automation and smart manufacturing systems to enable flexible, high-mix, low-volume production. Custom Precision Cold-Drawn SS Tube – TP304, Ø50.8 x 2mm, ASTM A269. Our products are widely used in construction machinery, hydraulic systems, automotive parts, wind energy, shipbuilding, railways, and oil & gas sectors. Certified to ISO 9001, ISO 14001, CE, and RoHS standards, Hongli is more than a manufacturer—we are a trusted long-term partner for global industrial clients.
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What Is ASTM A513 Type 5 DOM Tubing? ASTM A513 Type 5 defines cold-drawn electric-resistance-welded (ERW) tubing produced by the Drawn Over Mandrel (DOM) process. A flat steel strip is first roll-formed, welded, and the...
Specify 316L stainless steel, and an auditor or quality manager will still ask for the mill certificate, the surface finish report, and the declaration of compliance. The alloy is the starting point—not the finish line....
Pick the wrong tube material for a pneumatic cylinder, and the consequences show up fast—seized seals from corrosion, excessive bore wear from inadequate surface hardness, or a weight penalty that drives up your actuato...
A standard round tube quote can come back in hours. A custom shaped tube quote—oval, hexagonal, D-shaped, or a fully bespoke profile—often takes two to three days, and that's if the drawing is complete. If anything is m...