Import 316l Stainless Steel Square Pipe — Buy in wholesale FOB from Supplier in China

Shaanxi Tonghui Steel Co., Ltd. markets 316L stainless steel square pipe in dimensions from 5 mm by 5 mm up to 150 mm by 150 mm, with wall thicknesses ranging from 0.4 mm to 6.0 mm. The material is low-carbon austenitic stainless steel with maximum 0.03 percent carbon, placing it in the 316L grade family suitable for welded fabrications without post-weld solution annealing. The supplier classifies its offering into seamless and welded construction, with the square profile formed by cold drawing or cold rolling after welding. Surface finish is annealed and pickled, and the pipe is offered to ASTM A312 schedules including Sch10s, Sch40s, and Sch80s.

The 0.4 mm minimum wall distinguishes this range from heavy structural sections, positioning it toward instrumentation frames, food equipment supports, and light architectural trim rather than primary shipbuilding structures. Cold drawing after welding improves dimensional precision and surface finish, but can introduce residual stresses that affect straightness unless a subsequent stress-relief anneal is performed. The 316L composition with molybdenum addition resists crevice corrosion in mildly acidic or chloride-contaminated environments typical of pharmaceutical clean rooms and dairy processing lines. Buyers should note that wall thickness below 3 mm requires greater care during welding to avoid burn-through and distortion in the heat-affected zone.

Pharmaceutical equipment manufacturers, food machinery builders, and chemical plant maintenance contractors represent the core buyer segments for this thinner-walled square pipe. The supplier's reference to ASTM A312 rather than A554 signals intent for pressure piping or tubing applications where hydrostatic testing and non-destructive evaluation may be required. Xian, where the company is located, is an inland logistics hub with rail connections to coastal ports, so export buyers should factor inland transit into delivery schedules. The availability of 304, 304L, TP304, TP316L, 316, 316Ti, 321, 347H, and 310S grades from the same supplier suggests a stock-based model with mill relationships across the 300-series family.

Shaanxi Tonghui Steel Co., Ltd. operates from Room 2604, Unit 2, Building 1 of Jinq, Xian, 710086, Shaanxi Province, China. The address is a commercial office location in Xian rather than an industrial manufacturing site, indicating the company likely functions as a steel trader, stockist, or export agent rather than a primary mill. The harbour trust tier and zero percent response rate suggest limited platform engagement history, so buyers should initiate direct communication to assess English-language capability and technical competence before committing to purchase.

No information is provided about factory ownership, warehousing capacity, annual turnover, number of employees, or quality system certifications such as ISO 9001. The supplier does not list specific client references, export destinations, or project case studies. Buyers should therefore conduct standard due diligence, including a request for business registration documents, bank references, and a video factory tour if the company claims mill-direct supply. The broad grade availability across austenitic and heat-resistant stainless steels suggests established mill relationships, but this should be verified through mill test certificate traceability rather than assumed.