Import 304 Welded 70.33 Diameter Stainless Steel Pipe — Buy in wholesale FOB from Supplier in China

This welded stainless steel pipe from Foshan Kuanyu Stainless Steel Co., Ltd. carries a 70.33 millimetre outside diameter in 304 grade, an austenitic stainless steel specified as TP304/304L in ASTM nomenclature, where the dual certification allows carbon content below 0.03% for improved weldability and intergranular corrosion resistance. The welded construction method, longitudinal arc-welding from flat-rolled strip followed by cold finishing, produces a pipe with dimensional tolerances tighter than hot-finished seamless equivalents in the outer-diameter range. Seventy-point-three-three millimetres is a non-standard OD in some national schedules, suggesting this may be a metric derivative or custom-rolled size for specific OEM equipment, and buyers should confirm wall thickness against their pressure-design requirements rather than assuming a common schedule.

ASTM A312 and ASME B36.19M are cited as applicable standards, though these govern different aspects: A312 covers seamless and welded austenitic pipe for high-temperature and general corrosive service, while B36.19M defines dimensions and weights for stainless steel pipe. A single pipe cannot be manufactured to both in the same sense, so clarification from Foshan Kuanyu is needed on which test and inspection requirements from A312 (chemical analysis, mechanical testing, hydrostatic or non-destructive testing) are applied, and whether dimensions follow B36.19M Schedule 5S, 10S, 40S, or another series. The 304L designation implies low carbon, which is significant for welded structures because it reduces sensitisation risk in the heat-affected zone during fabrication or subsequent annealing.

Typical applications for 70.33mm 304 welded pipe include chemical process lines, food and dairy processing equipment, pharmaceutical water systems, and architectural structural supports where the combination of corrosion resistance and moderate strength suffices. B2B buyers should note that 304 grade is not suitable for prolonged exposure to chloride-rich environments (marine, de-icing salt, or certain chemical processes) without risk of pitting, for which 316L would be indicated. When importing from Foshan in Guangdong Province, confirm whether the pipe is supplied in random lengths, fixed 6-metre lengths, or cut-to-order, because this affects freight utilisation and downstream fabrication planning. Mill test certificates should show heat analysis for chromium, nickel, molybdenum, and carbon, plus tensile test results and a statement of solution-annealing condition.

Foshan Kuanyu Stainless Steel Co., Ltd. is located at No. 25-31, Block E1, Liyuan Metal Logistics Mall, Foshan City, Guangdong Province, China. This address places it within the Nanhai district's concentrated stainless steel distribution and light-processing zone, a hub that serves both domestic appliance manufacturers and export-oriented traders. The harbour trust tier indicates basic verification, though the 0.00% response rate and zero average response hours mean direct communication reliability is unproven. No information on founding year, employee count, annual turnover, or major clients appears in the source, and none should be invented.

The supplier's product focus, as evidenced by this and related listings, is on welded austenitic stainless steel pipe in TP304/304L and related grades. The source description makes reference to ISO and CE certification, though no certificate numbers, accreditation bodies, or scope statements are provided. Buyers should treat such claims as requiring independent verification: request copies of ISO 9001 and any CE marking documentation (for example, under CPR 305/2011/EU for construction products if applicable), and check validity through the issuing bodies' online databases. The mention of flexible MOQ is unsupported by figures; minimum order quantity and price must be negotiated directly with Foshan Kuanyu.