JIS G3459 Stainless Steel Coil Tube for Plumbing Applications
Product Overview
The JIS G3459 Stainless Steel Coil Tube (盘管 / Coil Tube) manufactured by Wenzhou Jixing Metal Materials Co., Ltd. is a premium-grade piping solution designed in strict accordance with the Japanese Industrial Standard JIS G3459 — "Stainless Steel Tubes for Plumbing Purposes." Supplied in continuous coil configuration, this product combines the superior corrosion resistance and hygienic properties of austenitic stainless steel with the fabrication flexibility inherent to coil form. The coil tube format eliminates the need for longitudinal welding at field joints, significantly reduces material waste during cutting and forming operations, and enables seamless integration into automated bending and piping systems. This product is specifically engineered for plumbing, water supply, and fluid conveyance systems, and is widely specified in Japanese-origin construction projects as well as across the Southeast Asian market.
Material & Properties
JIS G3459 governs a family of austenitic stainless steel grades selected for their exceptional resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC) in aqueous and mildly aggressive environments. The primary grades covered under this standard include:
- SUS304 / SUS304L — The workhorse grade offering balanced corrosion resistance, excellent formability, and weldability. SUS304L (low-carbon variant) is preferred for post-weld service without pickling.
- SUS316 / SUS316L — Molybdenum-enhanced grades (2–3% Mo) providing superior resistance to chlorides, acids, and marine environments. SUS316L is the recommended choice for welding applications.
- SUS321 / SUS347 — Titanium-stabilized and niobium-stabilized variants, respectively, designed for elevated-temperature service to prevent intergranular corrosion.
- SUS309 / SUS310S — High-temperature grades suitable for oxidizing and reducing furnace atmospheres up to approximately 1100°C.
All grades exhibit a face-centered cubic (FCC) austenitic crystal structure, ensuring non-magnetic properties (in the annealed condition), excellent ductility, and resistance to cryogenic embrittlement. The low-carbon (L) variants contain carbon ≤ 0.03% (mass fraction) to suppress chromium carbide precipitation at weld heat-affected zones (HAZ).
Specifications
| Parameter | Specification |
|---|---|
| Governing Standard | JIS G3459:2004 (and latest revision) — Stainless Steel Tubes for Plumbing Purposes |
| Available Grades | SUS304, SUS304L, SUS316, SUS316L, SUS321, SUS347, SUS309, SUS310S |
| Tube Form | Coil Tube (continuous coil configuration) |
| Outer Diameter (OD) | 3.0 mm – 50.8 mm (typical range; custom sizes available upon request) |
| Wall Thickness | 0.3 mm – 3.0 mm (tolerance per JIS G3459: ±10% nominal) |
| Coil Length | Continuous coil; standard coil weight 500 kg – 2,000 kg (negotiable) |
| Surface Finish | 2B (Cold-Rolled & Annealed), BA (Bright Annealed), No.4 Brushed, Mirror (upon request) |
| Manufacturing Method | Seamless (for larger OD) / Welded & Cold-Drawn (for smaller OD and tight tolerances) |
| Tensile Strength | ≥ 520 MPa (SUS304); ≥ 520 MPa (SUS316); ≥ 485 MPa (SUS310S) |
| Yield Strength (0.2% Proof) | ≥ 205 MPa (SUS304/316); ≥ 205 MPa (SUS316L) |
| Elongation | ≥ 40% (SUS304/316); ≥ 35% (SUS310S) |
| Hardness | ≤ 92 HRB (annealed condition) |
| Temperature Range | −196°C to +870°C (SUS304/316); up to +1100°C (SUS310S) |
| Pressure Rating | Per JIS G3459 allowable stress tables; varies by grade, OD, and wall thickness |
| Packaging | Wooden pallet with moisture-proof wrapping; export-grade packaging available |
Manufacturing Process
The production of JIS G3459 stainless steel coil tube follows a rigorous multi-stage process to ensure dimensional accuracy, metallurgical integrity, and surface quality:
- Raw Material Selection: High-purity stainless steel strip (cold-rolled coil) conforming to JIS G4305 (stainless steel cold-rolled sheet and strip) is procured. Chemical composition is verified via optical emission spectroscopy (OES) and inductively coupled plasma (ICP) analysis.
- Forming & Welding: The strip is fed through precision roller forming stations to achieve the target circular cross-section. For welded coil tubes, a high-frequency induction welding (HF) or gas tungsten arc welding (GTAW/TIG) process is employed to create the longitudinal seam. The welding parameters are continuously monitored to ensure full penetration and minimal heat input.
- Heat Treatment (Solution Annealing): The formed coil tube is subjected to solution annealing at 1010–1150°C followed by rapid cooling (air or water quench) to dissolve carbides, homogenize the microstructure, and restore full austenitic ductility.
- Pickling & Passivation: The annealed tube is immersed in a mixed acid bath (nitric + hydrofluoric acid) to remove the oxide scale formed during heat treatment. Subsequent passivation with dilute nitric acid establishes a protective chromium oxide film on the surface, enhancing corrosion resistance.
- Cold Drawing (if applicable): For smaller diameters and tighter dimensional tolerances, the coil tube undergoes cold drawing through precision dies to achieve final OD, wall thickness, and roundness within JIS G3459 tolerances.
- Coiling & Inspection: The finished tube is coiled onto a steel mandrel, with coil diameter and layering controlled to prevent mechanical damage. Each coil is inspected for surface defects, dimensional conformity, and weld integrity.
Applications
JIS G3459 stainless steel coil tube finds extensive application across multiple industries, particularly in environments demanding hygiene, durability, and corrosion resistance:
- Plumbing & Water Supply Systems: Potable water distribution, hot and cold water piping, and sanitary plumbing in residential, commercial, and institutional buildings — the primary intended use per JIS G3459.
- Gas Piping: Natural gas and liquefied petroleum gas (LPG) distribution systems, benefiting from the seamless coil form that minimizes leak-prone joints.
- Food & Beverage Processing: Hygienic piping for dairy, brewing, pharmaceutical, and food processing plants where CIP (Clean-In-Place) and SIP (Sterilize-In-Place) compatibility is essential.
- Chemical & Petrochemical Industry: Conveyance of mildly corrosive fluids, acids, and solvents in process plants, particularly where SUS316/SUS316L grades are specified.
- Building Services & HVAC: Condensate drainage, ventilation ducting support structures, and radiant heating loop piping.
- Automotive & Transportation: Fuel lines, brake lines, and exhaust system components requiring high-temperature and corrosion resistance.
- Japanese & Southeast Asian Construction Projects: Widely specified in infrastructure, commercial, and residential projects across Japan, Singapore, Malaysia, Indonesia, Thailand, and the Philippines, where JIS standards are adopted or referenced.
Quality Certifications & Compliance
Wenzhou Jixing Metal Materials Co., Ltd. maintains a comprehensive quality management system to ensure every coil tube product meets or exceeds the requirements of JIS G3459 and international expectations:
- ISO 9001:2015 — Quality Management System certification, demonstrating commitment to consistent product quality and continuous improvement.
- JIS G3459 Compliance: Full compliance with chemical composition, mechanical properties, dimensional tolerances, and surface quality requirements specified by the Japanese Industrial Standards Committee.
- Mill Test Certificates (MTC): Each shipment is accompanied by an EN 10204 3.1 type mill test certificate documenting heat number, chemical analysis, mechanical test results, and dimensional verification.
- Third-Party Inspection: Independent inspection by agencies such as SGS, Bureau Veritas, or JIS-certified testing laboratories is available upon customer request.
- Hydrostatic Testing: 100% of production undergoes hydrostatic pressure testing at 1.5× the maximum working pressure to verify weld integrity and absence of porosity or defects.
- Non-Destructive Testing (NDT): Electromagnetic (Eddy Current) testing and/or visual inspection of the longitudinal weld seam to ensure full fusion and absence of cracks, lack of fusion, or undercut.
- Traceability: Heat-number traceability from raw material mill through all manufacturing stages to final delivery, ensuring complete supply chain accountability.
Unique Selling Points
1. JIS G3459 Certified — Trusted in Japan & Beyond: This product is manufactured to the exacting standards of JIS G3459, the benchmark for plumbing-grade stainless steel tube in Japan. Its proven track record in Japanese construction and engineering projects translates directly to reliability and acceptance in Southeast Asian markets that adopt JIS specifications.
2. Coil Form Advantage: The continuous coil configuration offers substantial cost and fabrication benefits — reduced cutting waste (up to 30% material savings versus cut-length pipe), faster installation through automated bending and forming equipment, and fewer field joints, which directly reduces leak risk and long-term maintenance costs.
3. Wide Grade Availability: From economical SUS304 to premium SUS316L and high-temperature SUS310S, the full JIS G3459 grade spectrum is available, enabling engineers to select the optimal material for cost-performance balance without compromising on standard compliance.
4. Hygienic & Corrosion-Resistant: The bright annealed or polished surface finish provides a smooth, non-porous surface that inhibits bacterial growth, making it ideal for potable water and food-grade applications. The chromium oxide passive film self-heals in the presence of oxygen, ensuring long-term protection.
5. Export-Ready Quality: With ISO 9001 certification, full traceability, and export-grade packaging, this product is ready for global distribution — meeting the documentation and quality expectations of international project owners, specifiers, and regulatory bodies.
Technical Summary
In summary, the JIS G3459 Stainless Steel Coil Tube from Wenzhou Jixing Metal Materials Co., Ltd. represents a best-in-class solution for plumbing and fluid conveyance applications. Its adherence to the Japanese Industrial Standard JIS G3459 ensures compliance with the most stringent requirements for chemical composition, mechanical performance, and dimensional accuracy. The coil form factor provides unmatched fabrication efficiency and installation speed, while the austenitic stainless steel matrix delivers decades of corrosion-resistant service life. For projects targeting the Japanese market or Southeast Asian regions where JIS standards prevail, this product offers a reliable, certified, and cost-effective piping solution that meets the highest expectations of engineering excellence.