ASTM A269 Seamless & Welded Austenitic Stainless Steel Coil Tube
Product Overview
The ASTM A269 Stainless Steel Coil Tube is a premium-grade austenitic stainless steel tubing product manufactured by Wenzhou Jixing Metal Materials Co., Ltd in compliance with the internationally recognized ASTM A269 standard. Designed for both seamless and welded production methods, this coil tube is the most widely cited general-purpose specification in global stainless steel tube trade, making it the definitive benchmark for quality, consistency, and reliability across international markets.
Available in coil form for maximum processing flexibility, this product serves as a foundational material for a vast array of industrial, commercial, and consumer applications worldwide. Wenzhou Jixing Metal Materials Co., Ltd leverages advanced manufacturing capabilities to deliver coil tubes that meet the rigorous dimensional, mechanical, and metallurgical requirements of ASTM A269.
Material & Properties
ASTM A269 covers a comprehensive range of austenitic stainless steel grades, each selected for specific performance characteristics including corrosion resistance, mechanical strength, and formability. The following grades are commonly available in coil tube form:
- ASTM A269 Grade 304 / 304L — General-purpose austenitic grade offering excellent corrosion resistance, weldability, and formability; suitable for food processing, chemical, and architectural applications.
- ASTM A269 Grade 316 / 316L — Enhanced molybdenum content provides superior resistance to pitting and crevice corrosion in aggressive chemical and marine environments.
- ASTM A269 Grade 321 / 347 — Stabilized grades with titanium or niobium addition, ideal for high-temperature service where sensitization resistance is critical.
- ASTM A269 Grade 310 / 310S — High-temperature austenitic grades with outstanding oxidation resistance, suitable for furnace components and high-heat industrial processes.
Typical Mechanical Properties
| Property | ASTM A269 Grade 304 | ASTM A269 Grade 316 | ASTM A269 Grade 321 |
|---|---|---|---|
| Minimum Tensile Strength | 515 MPa (75,000 psi) | 515 MPa (75,000 psi) | 515 MPa (75,000 psi) |
| Minimum Yield Strength (0.2% Offset) | 205 MPa (30,000 psi) | 205 MPa (30,000 psi) | 205 MPa (30,000 psi) |
| Minimum Elongation | 35% | 35% | 35% |
| Hardness (Rockwell B) | ≤ 95 | ≤ 95 | ≤ 95 |
| Maximum Carbon Content | 0.08% | 0.08% | 0.08% |
| Chromium Content (min) | 18.0% | 16.0% | 17.0% |
| Nickel Content (min) | 8.0% | 10.0% | 9.0% |
Specifications
| Specification Parameter | Details |
|---|---|
| Governing Standard | ASTM A269 / A269M |
| Product Type | Coil Tube (盘管) — Seamless and Welded |
| Classification | General Purpose Austenitic Tubes |
| Available Grades | 304, 304L, 316, 316L, 321, 347, 310, 310S, and others per ASTM A269 |
| Outside Diameter | 3.18 mm (1/8") to 114.30 mm (4.5") |
| Wall Thickness | 0.25 mm (0.010") to 11.13 mm (0.440") |
| Coil Length | Random length (typically 10 m to 30 m per coil; custom lengths available) |
| Surface Finish | Pickled & Passivated, Bright Annealed, Polished, Brushed |
| Manufacturing Method | Seamless (Pierced / Extruded) and Welded (ERW / Argon Welded) |
| Tolerance | Per ASTM A269 dimensional tolerance requirements |
| Packaging | Export-grade coil packaging with protective wrapping and wooden pallets |
Manufacturing Process
Wenzhou Jixing Metal Materials Co., Ltd employs a rigorous multi-stage manufacturing process to produce ASTM A269 compliant coil tubes that meet the highest quality standards:
- Raw Material Selection: High-purity austenitic stainless steel billets and strip are sourced from certified mills, with incoming material verified through spectroscopic analysis (PMI) to confirm chemical composition compliance with ASTM A269 requirements.
- Seamless Production (Piercing / Extrusion): For seamless coil tubes, heated billets are pierced or extruded through precision dies to form hollow tubes. This process ensures a fully homogeneous microstructure with no weld seams, providing superior integrity for high-pressure and critical service applications.
- Welded Production (ERW / Argon Shielded Welding): Cold-rolled stainless steel strip is precisely formed and welded using Electric Resistance Welding (ERW) or argon-shielded welding techniques. The weld seam is subsequently ground and inspected to ensure full metallurgical continuity.
- Heat Treatment & Annealing: Tubes undergo solution annealing at controlled temperatures followed by rapid cooling (quenching) to achieve the desired austenitic microstructure, optimize corrosion resistance, and relieve residual stresses.
- Pickling & Passivation: A chemical pickling process removes oxide scale and surface contaminants, followed by passivation treatment to restore the protective chromium oxide passive layer on the tube surface, ensuring maximum corrosion resistance.
- Coiling & Dimensional Inspection: Finished tubes are coiled to specified diameters and lengths. Each coil undergoes comprehensive dimensional verification including outside diameter, wall thickness, straightness, and length measurement using calibrated gauges and ultrasonic thickness testing equipment.
- Final Quality Assurance & Packaging: Every coil is subjected to final visual inspection, hydrostatic testing (where required), and mechanical property verification. Approved coils are protected with anti-corrosion wrapping, secured on wooden pallets, and labeled with full traceability documentation for export.
Applications
As the most widely referenced general-purpose standard in international stainless steel tube trade, ASTM A269 coil tubes find applications across a remarkably broad spectrum of industries:
- Food & Beverage Processing: Sanitary-grade tubing for dairy, brewing, pharmaceutical, and food processing equipment where hygiene and corrosion resistance are paramount.
- Chemical Processing: Pipelines, heat exchangers, reactors, and storage vessels handling aggressive chemicals, acids, and caustic solutions.
- Petrochemical & Oil/Gas: Downstream processing equipment, instrumentation tubing, and corrosion-resistant piping systems.
- Heat Exchangers & Boilers: Coil tubes for shell-and-tube heat exchangers, condensers, evaporators, and boiler components requiring thermal stability and corrosion resistance.
- Architecture & Decoration: Structural framing, handrails, balustrades, and decorative elements for modern building design.
- Automotive & Transportation: Exhaust systems, fuel lines, and structural components requiring high-temperature and corrosion resistance.
- Medical & Pharmaceutical: Surgical instrument handles, medical equipment frames, and pharmaceutical processing systems requiring biocompatible, sterilizable surfaces.
- Marine & Offshore: Piping systems, structural components, and equipment exposed to saltwater and aggressive marine environments.
Quality Certifications & Standards Compliance
Wenzhou Jixing Metal Materials Co., Ltd maintains a comprehensive quality management framework ensuring full compliance with ASTM A269 and related international standards. All coil tube products are backed by the following certifications and quality assurances:
- ASTM A269 / A269M Compliance: Full compliance with ASTM A269 Standard Specification for Seamless and Welded Austenitic Stainless Steel Tubes for General Service — the most widely cited general standard in international trade.
- ISO 9001:2015 Quality Management System: Certified quality management system ensuring consistent product quality, process control, and continuous improvement across all manufacturing stages.
- Mill Test Certificates (MTC): Every shipment is accompanied by EN 10204 Type 3.1 Mill Test Certificates providing full traceability of chemical composition, mechanical properties, and heat treatment records.
- Third-Party Inspection: Independent inspection by recognized third-party bodies (SGS, BV, TÜV) available upon request for additional quality verification.
- Hydrostatic Testing: All tubes undergo hydrostatic pressure testing per ASTM A269 requirements to verify structural integrity and freedom from defects.
- Non-Destructive Testing (NDT): Eddy current testing, ultrasonic testing, and magnetic particle inspection are applied as appropriate to detect surface and subsurface defects.
Why Choose Wenzhou Jixing Metal Materials Co., Ltd?
As a leading manufacturer of ASTM A269 stainless steel coil tubes, Wenzhou Jixing Metal Materials Co., Ltd combines advanced manufacturing technology with rigorous quality control to deliver products that set the benchmark for the global stainless steel tube market. With full traceability, comprehensive testing, and adherence to the most widely recognized international standard (ASTM A269), our coil tubes provide the reliability and performance demanded by the world's most demanding industries.
Unique Selling Points
- Industry-Defining Standard Compliance: ASTM A269 is the most widely cited general standard in international stainless steel tube trade, ensuring maximum market acceptance and regulatory compliance worldwide.
- Dual Production Capability: Both seamless and welded manufacturing options provide customers with the flexibility to select the optimal production method for their specific application requirements and budget considerations.
- Comprehensive Grade Range: Availability of multiple austenitic grades (304, 316, 321, 347, 310, and more) allows precise material selection tailored to specific corrosion, mechanical, and temperature requirements.
- Coil Format Advantage: Coil tube format maximizes material utilization, minimizes waste, and facilitates automated processing, bending, and forming operations in downstream manufacturing.
- Full Traceability: Complete heat-to-heat traceability from raw material through final product ensures accountability and supports quality assurance programs in regulated industries.