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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 E-Coated Steel Pipes are treated with electro-coating (E-coating) to provide excellent corrosion resistance and a uniform black finish.These pipes are ideal for applications where durability, corrosion protection, and appearance are critical. The electro-coating process ensures that the coating penetrates crevices and internal surfaces, offering full protection compared to traditional surface coatings.
