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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.
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. 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.
Our EN 10305-2 Cold Drawn Welded (CDW) Honed & SRB Tubes are precision-processed to deliver mirror-like internal finishes (Ra ≤ 0.4 μm) and H8 tolerance, making them ideal for hydraulic cylinder barrels.Compared with seamless tubes (EN 10305-1), these welded tubes provide a cost-effective solution while maintaining excellent straightness, roundness, and surface finish, suitable for both industrial and mobile hydraulic applications.
