JIS G3459 Stainless Steel Coil Tube for Piping Applications
Product Overview
The JIS G3459 Stainless Steel Coil Tube is a precision-engineered continuous-length pipe product manufactured in compliance with the Japanese Industrial Standard JIS G3459 — the authoritative specification governing stainless steel piping for general fluid transportation and plumbing systems. Produced by Wenzhou Jixing Metal Materials Co., Ltd., this coil tube is delivered in continuous coiled form, offering superior material utilization, reduced welding joints, and enhanced structural integrity compared to cut-length alternatives. As a general-purpose piping solution, it is widely adopted in Japanese-origin construction projects and across the Southeast Asian market, where adherence to JIS standards is a contractual and regulatory requirement.
Material & Properties
JIS G3459 designates specific stainless steel grades suitable for piping service, primarily including:
- SUS304 (JIS G3459) — Austenitic chromium-nickel stainless steel (18Cr-8Ni equivalent), offering excellent corrosion resistance and formability for general water supply and process piping.
- SUS316 (JIS G3459) — Molybdenum-enhanced austenitic grade (18Cr-12Ni-2Mo), providing superior resistance to chloride-induced pitting and crevice corrosion in aggressive environments.
- SUS304L / SUS316L — Low-carbon variants designed for improved weldability and resistance to intergranular corrosion in post-weld service conditions.
Key mechanical and physical properties conform to JIS G3459 requirements, including minimum yield strength, tensile strength, elongation at fracture, and hardness limits as specified by grade and nominal outer diameter.
Specifications
| Parameter | Specification / Requirement |
|---|---|
| Applicable Standard | JIS G3459 — Stainless Steel Pipe for Piping |
| Product Form | Continuous Coil Tube (盘管) |
| Material Grades | SUS304, SUS316, SUS304L, SUS316L |
| Nominal Outer Diameter | φ6.0 mm – φ168.3 mm (per JIS G3459 dimensional table) |
| Wall Thickness | 0.5 mm – 6.0 mm (grade and diameter dependent) |
| Coil Length | Typically 500 m – 3,000 m per coil (customizable) |
| Coil Inner Diameter | φ200 mm – φ600 mm (standard packaging) |
| Surface Finish | No.1 Annealed (2B / BA finish available upon request) |
| Tolerance — Outer Diameter | ±0.15 mm (for OD ≤ 50.8 mm); ±0.20% (for OD > 50.8 mm) |
| Tolerance — Wall Thickness | ±0.10 mm (for WT ≤ 3.0 mm); ±0.10% (for WT > 3.0 mm) |
| Manufacturing Method | Seamless (for smaller diameters) / Welded (ERW/AW for larger diameters) |
| Heat Treatment | Solution Annealing + Pickling (SA/P) |
| Hydrostatic Test | 100% tested per JIS G3459 §7.3.3 |
| End Condition | Plain end (beveled ends available on request) |
Manufacturing Process
- Raw Material Selection: High-purity stainless steel billets or flat strips conforming to JIS G4305 (for seamless) or JIS G3131 (for welded strip) are procured with full chemical composition verification.
- Piercing & Hot Rolling (Seamless Route): Billets are heated to 1,100–1,200°C, pierced into hollow blooms, and hot-rolled to approximate final dimensions.
- Forming & Welding (Welded Route): Cold-rolled stainless steel strip is formed into tubular geometry and welded via Electro-Resistance Welding (ERW) or Automatic Submerged Arc Welding (AW).
- Precision Sizing: Multi-stand cold sizing ensures dimensional accuracy within JIS G3459 tolerances.
- Solution Annealing: Tubes are heated to 1,050–1,150°C in a protective atmosphere furnace and rapidly cooled to achieve full solution treatment, dissolving carbides and restoring austenitic microstructure.
- Pickling & Passivation: Acid pickling removes scale and oxide films; subsequent passivation establishes a protective chromium oxide layer.
- Coiling: Finished tubes are coiled at controlled tension onto standard-diameter coils with protective strapping and moisture-barrier wrapping.
- Quality Inspection: Each coil undergoes chemical analysis, dimensional verification, hydrostatic pressure testing, and visual/eddy-current inspection for surface and wall defects.
Applications
- Building Water Supply Systems: Potable water distribution, hot and cold water piping in residential, commercial, and institutional construction — particularly prevalent in Japanese-specification projects across Southeast Asia.
- Gas Piping: Natural gas and LPG distribution systems requiring corrosion-resistant, leak-tight piping.
- Food & Beverage Processing: Sanitary piping for dairy, brewery, and pharmaceutical fluid transfer systems.
- Chemical & Petrochemical: Process piping handling mildly to moderately aggressive fluids where SUS316 grade is specified.
- HVAC Systems: Chilled water, condenser, and refrigerant lines in commercial HVAC installations.
- Marine & Coastal Infrastructure: Piping systems exposed to chloride-rich environments.
Quality Certifications
Every production lot of JIS G3459 Stainless Steel Coil Tube is accompanied by comprehensive quality documentation:
- Mill Test Certificate (MTC / En 10204 3.1): Full chemical composition analysis and mechanical property test results certified by an authorized quality representative.
- JIS G3459 Compliance Declaration: Formal statement of conformity to all applicable clauses of the standard.
- Hydrostatic Test Records: Individual tube or batch-level pressure test data with pass/fail documentation.
- Traceability: Heat number, coil number, and production batch information enabling full supply chain traceability.
- Third-Party Inspection (Available): Optional inspection by accredited bodies such as JQA (Japan Quality Assurance) or SGS for project-specific requirements.
Unique Selling Points
- Full JIS G3459 Compliance: Manufactured to the exacting standards required for Japanese-origin engineering projects, eliminating specification risk for contractors and consultants.
- Continuous Coil Format: Minimizes field welding requirements, reducing installation time, joint failure points, and total project cost by up to 30% compared to cut-length pipe.
- Southeast Asian Market Expertise: Proven supply track record serving major infrastructure and construction projects across Japan, Singapore, Thailand, Vietnam, and Malaysia.
- Customizable Coil Configuration: Coil length, inner diameter, and surface finish tailored to project-specific delivery and handling requirements.
- Comprehensive Documentation: Full traceability and certification package ensuring seamless integration into international project quality assurance frameworks.
Note: All products supplied under JIS G3459 are intended for general piping applications. For high-pressure, cryogenic, or specialized service conditions, consult Wenzhou Jixing Metal Materials Co., Ltd. engineering team for grade selection and design validation guidance.