ASTM A269 Seamless & Welded Austenitic Stainless Steel Coil Tubing
ASTM A269 represents the most widely referenced and internationally recognized specification for seamless and welded austenitic stainless steel tubing in global trade. Manufactured by Wenzhou Jixing Metal Materials Co., Ltd, our ASTM A269 coil tubing delivers exceptional corrosion resistance, mechanical integrity, and dimensional precision across a broad range of industrial applications.
Product Overview
ASTM A269 is the definitive American Society for Testing and Materials (ASTM) standard governing seamless and welded austenitic stainless steel tubing. This specification covers a comprehensive range of austenitic grades including 304, 304L, 316, 316L, 316Ti, 316LN, 321, 321H, 347, 347H, 904L, 201, and 430 among others. The standard is universally adopted across chemical processing, food and beverage, pharmaceutical, semiconductor manufacturing, oil and gas, and architectural industries worldwide.
Our coil tubing products are supplied in coiled form, offering significant advantages in material utilization, handling efficiency, and downstream processing flexibility. The coiled configuration enables continuous feeding in automated manufacturing lines, minimizing waste and maximizing production throughput.
Material & Properties
ASTM A269 austenitic stainless steel tubing is characterized by its face-centered cubic (FCC) crystal structure, which provides superior ductility, formability, and non-magnetic properties. Key metallurgical features include:
- Corrosion Resistance: Excellent resistance to atmospheric, chemical, and industrial environments due to the high chromium (Cr ≥ 18%) and nickel (Ni ≥ 8%) alloying content. 316 and 316L grades offer enhanced resistance to chlorides and pitting corrosion through molybdenum (Mo) addition.
- Mechanical Properties: Tensile strength ranging from 485–725 MPa depending on grade and condition; yield strength typically ≥ 205 MPa; elongation ≥ 35% ensuring excellent cold-working capability.
- Weldability: Superior weldability with minimal preheating or post-weld treatment required, enabling reliable TIG (Tungsten Inert Gas) and orbital welding processes.
- Cryogenic Performance: Maintains mechanical strength and toughness at temperatures as low as −196°C, making it suitable for cryogenic applications.
- Non-magnetic: In the annealed condition, austenitic grades exhibit negligible magnetic permeability, critical for electronic and medical equipment applications.
Specifications
| Parameter | Specification |
|---|---|
| Standard | ASTM A269 / A269M — Seamless and Welded Austenitic Stainless Steel Tubing |
| Applicable Grades | 304, 304L, 316, 316L, 316Ti, 316LN, 321, 321H, 347, 347H, 904L, 201, 430, 310S |
| Outer Diameter (OD) | 3.18 mm – 254 mm (1/8" – 10") |
| Wall Thickness | 0.51 mm – 12.7 mm (0.020" – 0.500") |
| Surface Finish | Pickled & Passivated (P&P), Polished (No. 1, 2B), Bright Annealed, Mirror (8K) |
| Delivery Form | Coiled (Coil Tubing) |
| Coil Diameter | Customizable, typically 600 mm – 1,200 mm |
| Tolerance — OD | ± 0.05 mm (precision grade available) |
| Tolerance — Wall Thickness | ± 0.05 mm (precision grade available) |
| Heat Treatment | Solution Annealed (1040°C – 1150°C), followed by rapid cooling |
| Corrosion Resistance (316L) | Pitting Resistance Equivalent Number (PREN) ≥ 24 |
| Maximum Service Temperature | Up to 870°C (1600°F) for most austenitic grades |
| Minimum Service Temperature | −196°C (−321°F) — cryogenic applications |
Manufacturing Process
Our ASTM A269 coil tubing is produced through a rigorous, multi-stage manufacturing process ensuring consistent quality and dimensional accuracy:
- Raw Material Selection: Virgin or certified recycled stainless steel billets are sourced from approved mills, with chemical composition verified through Spectroscopic Analysis (OES) to ensure compliance with ASTM A269 grade requirements.
- Hot Rolling & Piercing: Steel billets are heated to 1,200°C–1,250°C and pierced to form hollow tubes. For seamless tubing, the plug piercing (Mannesmann) or rotary piercing method is employed to achieve uniform wall thickness.
- Cold Drawing: Tubes are cold-drawn through precision dies to achieve target outer diameter and wall thickness with tight tolerances. Multiple drawing passes may be applied for high-precision requirements.
- Coiling: The finished tubing is wound into coils using automated coiling systems that control tension and alignment to prevent deformation, kinking, or surface damage.
- Solution Annealing: Tubes are heated to 1,040°C–1,150°C and rapidly quenched (air or water) to restore full austenitic microstructure, relieve internal stresses, and achieve maximum corrosion resistance and ductility.
- Pickling & Passivation: Surface scale and oxide layers are removed through acid pickling (nitric/hydrofluoric acid blend), followed by passivation to form a stable chromium oxide protective layer.
- Quality Inspection: Comprehensive testing includes hydrostatic pressure testing, dimensional measurement, surface inspection, chemical analysis, mechanical testing, and intergranular corrosion testing (ASTM A269 Section 10).
Applications
ASTM A269 coil tubing is the preferred material for demanding industrial applications requiring proven reliability, corrosion resistance, and hygienic performance:
- Chemical Processing: Heat exchangers, piping systems, reactors, and transport lines handling aggressive chemicals, acids, and solvents.
- Food & Beverage Industry: Processing equipment, sanitary piping, brewing systems, and dairy processing lines where hygienic surface finishes (Ra ≤ 0.5 μm) are mandated.
- Pharmaceutical & Biotech: CIP (Clean-in-Place) and SIP (Sterilization-in-Place) compatible tubing systems requiring FDA-compliant materials and electropolished surfaces.
- Semiconductor Manufacturing: Ultra-high purity (UHP) gas delivery systems, process fluid lines, and vacuum chambers demanding contamination-free transport.
- Oil & Gas: Downhole tubing, subsea production lines, and corrosion-resistant alloy applications in sour service environments.
- Cryogenic Systems: Liquefied natural gas (LNG) transport, superconducting magnet cooling, and low-temperature process equipment.
- Architectural & Structural: Decorative handrails, structural supports, and architectural features requiring weathering resistance and aesthetic finish.
- Automotive & Aerospace: Exhaust systems, fuel lines, hydraulic lines, and structural components requiring high-temperature and corrosion resistance.
Quality Certifications & Compliance
Wenzhou Jixing Metal Materials Co., Ltd maintains rigorous quality management systems and holds the following certifications ensuring full traceability and compliance:
- ISO 9001:2015 — Quality Management System certification ensuring consistent product quality and customer satisfaction.
- ISO 14001 — Environmental Management System certification demonstrating environmental responsibility in production processes.
- CE Marking — European Conformity certification confirming compliance with EU safety, health, and environmental protection requirements.
- Mill Test Certificates (MTC) — EN 10204 Type 3.1 certificates issued for every batch, providing full chemical composition, mechanical properties, and heat treatment documentation.
- ASTM A269 Compliance — Full adherence to ASTM A269/A269M specification including all mandatory and optional test requirements (Sections 1–10).
- Third-Party Inspection — Available upon request through SGS, Bureau Veritas, or TÜV for independent verification of product conformity.
Unique Selling Point: ASTM A269 is the single most widely cited and globally accepted standard for austenitic stainless steel tubing in international trade. Our coil tubing products provide seamless compatibility with procurement specifications worldwide, ensuring hassle-free integration into global supply chains. The coiled delivery format offers superior material efficiency (up to 15% less waste versus cut lengths), enhanced handling convenience, and compatibility with automated downstream processing equipment.