Import 317 Seamless Stainless Steel Pipe — Buy in Bulk from Supplier in China

This 317 seamless stainless steel pipe from Zhejiang Yingsheng Stainless Steel Pipe Co., Ltd. is a cold-drawn or cold-rolled austenitic tubular product with no longitudinal weld seam, manufactured for pressure containment and corrosive service. The seamless construction eliminates the heat-affected zone and potential defect structures associated with welded pipe, providing uniform circumferential properties critical for high-pressure and cyclic loading applications. Type 317's elevated molybdenum content, nominally 3.0-4.0%, confers superior resistance to pitting and crevice corrosion in chloride-bearing media compared to 304 or 316 grades. The pipe is supplied in random or fixed lengths with plain ends, bevelled ends, or threaded ends according to buyer specification, with typical manufacturing standards including ASTM A312 for seamless wrought austenitic pipe.

The source description references TP304, 304L, and 304LN as key materials, which appears to be generic template content rather than specific to this 317 grade offering, buyers should clarify actual grade certification with the supplier. For 317 seamless pipe, typical dimensions range from 6mm to 610mm outside diameter, with wall thickness expressed in schedules or direct millimetre measurement. Cold-drawn manufacture achieves tighter dimensional tolerances and improved surface finish than hot-extruded alternatives, with typical outside diameter tolerance of +/-0.5% for ASTM A312 standard. The austenitic structure provides excellent toughness at cryogenic temperatures and maintains strength up to approximately 870 degrees Celsius, though long-term exposure above 425 degrees Celsius may precipitate intermetallic phases.

Primary applications span oil and gas gathering lines, chemical process piping, pharmaceutical sterile systems, and heat exchanger tubing where leak tightness and corrosion resistance are paramount. The seamless format is mandatory for many ASME pressure vessel and piping codes in high-hazard services. Buyers should specify whether they require 317 or the low-carbon 317L variant, as the latter is essential for welded installations without post-weld heat treatment. The supplier's location in Wenzhou, Zhejiang Province, places it within China's concentrated stainless pipe manufacturing cluster, though buyers must verify whether the company operates its own seamless mill or sources through subcontract arrangements. Response data is unavailable, so direct enquiry is necessary to confirm current production capacity, minimum order quantities, and lead times.

Zhejiang Yingsheng Stainless Steel Pipe Co., Ltd. is located in Lantian Industrial Zone, Haibin, Longwan, Wenzhou 325024, China, situating it within one of China's principal stainless steel pipe and fitting production concentrations. The supplier holds imported-tier classification with harbour trust tier, with no response rate or average response time data currently recorded. The company name specifically references stainless steel pipe manufacture, suggesting specialised rather than general trading operations, though the listing does not confirm ownership of piercing, extrusion, or cold-drawing equipment. No information regarding year of establishment, number of employees, annual tonnage output, or major domestic or international clients is provided in the source material.

The Wenzhou region's industrial ecology supports numerous seamless pipe mills with access to round steel billet feedstock from regional producers, potentially offering vertical integration advantages. Buyers should note that the source description contains generic material references (TP304, 304LN) that do not align with the advertised 317 product, indicating possible template reuse rather than grade-specific content generation. For verification, importers should request company registration documents, ISO 9001 certification scope specifically covering 317 seamless pipe production, and mill test certificates from recent heats. The absence of response metrics means all commercial terms, production schedules, and quality assurance details require direct negotiation with the supplier.