JIS G3459 Stainless Steel Coil Tube for Piping Applications
Product Overview
Wenzhou Jixing Metal Materials Co., Ltd. manufactures high-quality stainless steel coil tubes conforming to the JIS G3459 standard, specifically engineered for general piping applications. As one of the most widely adopted Japanese Industrial Standards for stainless steel tubing, JIS G3459 governs the production of austenitic, ferritic, martensitic, and duplex stainless steel tubes used in plumbing, fluid transport, and process piping systems. These coil tubes are supplied in continuous coil form, offering significant advantages in downstream fabrication efficiency, material utilization, and cost-effectiveness compared to straight-length tubing.
The product line is purpose-built to serve Japanese infrastructure projects, international engineering contracts, and the rapidly expanding Southeast Asian market, where JIS-certified materials are specified by design engineers, contractors, and regulatory authorities.
Material & Properties
JIS G3459 covers a comprehensive range of stainless steel grades, with the most commonly specified austenitic grades being:
- SUS304 (JIS) / 18-8 (UNS S30400) — The workhorse grade for general piping, offering excellent corrosion resistance, formability, and weldability in most atmospheric and mildly corrosive environments.
- SUS304L (JIS) / 18-8L (UNS S30403) — A low-carbon variant of SUS304, designed for superior weldability and resistance to intergranular corrosion, making it ideal for welded piping assemblies.
- SUS316 (JIS) / 18-10-2 (UNS S31600) — Molybdenum-enhanced grade providing superior resistance to chlorides, acids, and marine environments.
- SUS316L (JIS) / 18-10-2L (UNS S31603) — Low-carbon molybdenum-bearing grade for demanding corrosive service and welded applications.
- SUS310S (JIS) / 25-20L (UNS S31008) — High-temperature grade for furnace applications and elevated-temperature piping.
Typical Chemical Composition (Austenitic Grades per JIS G3459)
| Grade | C | S | P | Cr | Ni | Mo | Others |
|---|---|---|---|---|---|---|---|
| SUS304 | ≤0.08 | ≤0.030 | ≤0.045 | 18.0–20.0 | 8.0–10.5 | — | — |
| SUS304L | ≤0.030 | ≤0.030 | ≤0.045 | 18.0–20.0 | 8.0–10.5 | — | — |
| SUS316 | ≤0.08 | ≤0.030 | ≤0.045 | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 | — |
| SUS316L | ≤0.030 | ≤0.030 | ≤0.045 | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 | — |
Mechanical Properties (Austenitic Grades, Annealed Condition)
| Property | SUS304 / 304L | SUS316 / 316L |
|---|---|---|
| Tensile Strength (MPa) | ≥520 | ≥520 |
| Yield Strength (0.2% Proof, MPa) | ≥205 | ≥205 |
| Elongation (%) | ≥40 | ≥40 |
| Hardness (HBW) | ≤210 | ≤210 |
Specifications
| Parameter | Specification |
|---|---|
| Standard | JIS G3459 (Stainless Steel Tubes for Piping) |
| Product Form | Coil Tube (Continuous Coil) |
| Manufacturing Method | Seamless / Welded (ERW, FAW) |
| Outer Diameter (OD) | 6.0 mm – 168.3 mm (0.236 in – 6.626 in) |
| Wall Thickness | 0.5 mm – 12.0 mm (0.020 in – 0.472 in) |
| Coil Length | Custom lengths; typically 2,000 mm – 6,000 mm (78.7 in – 236.2 in) per coil |
| Surface Finish | BA (Bright Annealed), 2B, No. 1, Pickled & Oiled |
| Available Grades | SUS304, SUS304L, SUS316, SUS316L, SUS310S, SUS430, SUS430L, SUS409, SUS441, SUS630, SUS631, SUS321, SUS347 |
| Dimensional Tolerance | Per JIS G3459 Table 7 (OD tolerance: ±0.5% for seamless; ±0.3% for welded) |
| Heat Treatment | Solution Annealing (1050–1150°C) followed by controlled cooling |
| Delivery Condition | Annealed (A), Solution Annealed (SA), Cold Worked (CW) |
| Coil ID | Typically 152 mm (6.0 in) or 304.8 mm (12.0 in) |
| End Condition | Plain cut, or with protective end caps |
Manufacturing Process
The production of JIS G3459 compliant stainless steel coil tubes at Wenzhou Jixing Metal Materials Co., Ltd. follows a rigorous multi-stage process to ensure dimensional accuracy, metallurgical integrity, and surface quality:
- Hot Rolling / Billet Preparation — High-purity stainless steel billets are produced from certified scrap and alloy additions through electric arc furnace (EAF) or vacuum arc remelting (VAR) processes, ensuring precise chemical composition control.
- Hot Extrusion / Pipe Making — Billets are heated to 1,100–1,200°C and extruded or pierced to form hollow tubes (seamless process), or flat strip is roll-formed and longitudinally welded (welded process).
- Pilot Welding (ERW / FAW) — for Welded Tubes — Continuous longitudinal welding is performed using electric resistance welding (ERW) or flash butt welding (FBW) techniques, producing a tight, metallurgically sound weld seam.
- Heat Treatment (Solution Annealing) — Tubes are annealed at 1,050–1,150°C and rapidly cooled (water quench or controlled air cooling) to dissolve carbides, achieve the desired austenitic microstructure, and ensure maximum corrosion resistance and ductility.
- Pickling and Passivation — The surface oxide scale is removed via acid pickling (mixed HNO₃/HF solution), followed by passivation to form a stable chromium oxide protective layer.
- Dimensional Correction and Sizing — Cold drawing, rolling, or mandrel sizing operations ensure the tube meets JIS G3459 dimensional tolerances for outer diameter, wall thickness, and roundness.
- Surface Finishing — Bright annealing (BA) in a controlled reducing atmosphere (H₂/N₂) produces a clean, bright surface suitable for food-grade and pharmaceutical piping. Alternatively, 2B finish or pickled-and-oiled finish is available.
- Coiling — Finished tubes are wound into coils of specified length and diameter using precision coiling equipment to prevent kinking, denting, or surface damage.
- Final Inspection and Testing — Each coil undergoes comprehensive quality verification including chemical analysis, mechanical testing, dimensional measurement, hydrostatic testing, and surface inspection.
Applications
JIS G3459 stainless steel coil tubes are specified across a broad spectrum of industrial and commercial piping applications:
- Building Services and Plumbing — Domestic water supply, sanitary plumbing, heating systems, and HVAC piping in residential, commercial, and institutional construction projects.
- Food and Beverage Processing — Transfer piping for dairy, brewing, winemaking, and general food processing where hygienic, corrosion-resistant piping is mandated.
- Pharmaceutical and Biotechnology — Process piping and sanitary transfer lines requiring high purity and ease of clean-in-place (CIP) procedures.
- Chemical and Petrochemical — Piping systems for corrosive chemical transfer, acid handling, and process plant installations.
- Marine and Offshore — Piping for desalination plants, shipboard systems, and offshore platform utilities.
- Power Generation — Condensate lines, feedwater piping, and auxiliary systems in thermal and nuclear power plants.
- Automotive and Aerospace — Fuel lines, exhaust system components, and hydraulic piping.
- Mechanical Equipment Fabrication — Raw material for pipe fittings manufacturers, tube processors, and equipment fabricators who require continuous coil stock for high-throughput production.
Quality Certifications & Compliance
Wenzhou Jixing Metal Materials Co., Ltd. maintains a comprehensive quality management system to ensure full traceability and compliance with international standards:
- JIS G3459 Compliance — Full compliance with the Japanese Industrial Standard for stainless steel tubes for piping, including chemical composition, mechanical properties, dimensional tolerances, and testing requirements.
- ISO 9001:2015 — Certified Quality Management System ensuring consistent product quality and continuous improvement.
- ISO 14001 — Environmental Management System certification demonstrating commitment to sustainable manufacturing practices.
- Mill Test Certificates (MTC) — EN 10204 Type 3.1 certificates provided with every shipment, documenting chemical analysis, mechanical test results, and heat treatment records.
- Hydrostatic Testing — 100% hydrostatic pressure testing per JIS G3459 requirements to verify structural integrity and absence of leaks.
- Positive Material Identification (PMI) — Optical emission spectrometry (OES) verification available for critical applications.
- Third-Party Inspection — Products available for inspection by SGS, Bureau Veritas, JQA, or other accredited third-party inspection bodies upon request.
- Equivalent Standards — Products are also cross-referenced to EN 10217-7, ASTM A269, ASTM A312, GB/T 14976, and GB/T 13296 for international project compatibility.
Unique Selling Points
Market-Focused Standard Compliance: JIS G3459 is the dominant specification for stainless steel piping in Japan and across Southeast Asia. Wenzhou Jixing Metal Materials Co., Ltd. specializes in this standard, providing project engineers and procurement teams with a reliable, readily available supply of JIS-certified coil tubing — eliminating the need for costly conversions between standards.
- Continuous Coil Form Factor — Coil supply dramatically reduces downstream fabrication waste, minimizes welding joints, and enables high-speed automated tube processing, delivering significant cost savings over straight-length tubing.
- Wide Grade Availability — From standard SUS304 to specialty duplex and high-temperature grades, the product range covers virtually every JIS G3459 specified grade, providing one-stop sourcing convenience.
- Custom Coil Configuration — Flexible coil lengths, custom coil inner diameters, and tailored surface finishes accommodate diverse fabrication line requirements.
- Full Traceability — Each coil is heat-numbered and traceable to the original steelmaking heat, ensuring complete material accountability throughout the supply chain.
- Competitive Lead Times — Maintained stock of common specifications enables rapid dispatch for project-critical deliveries, while custom orders benefit from efficient production scheduling.
- Technical Support — Dedicated engineering support for material selection, specification clarification, and application engineering to ensure optimal product performance in end-use service.
Ordering & Technical Support
For detailed quotations, technical data sheets, sample requests, or specification clarification, contact Wenzhou Jixing Metal Materials Co., Ltd. Provide the following information for accurate quotation:
- Stainless steel grade (e.g., SUS304, SUS316L)
- Outer diameter and wall thickness (mm)
- Required coil length and coil ID
- Surface finish preference (BA, 2B, Pickled & Oiled)
- Quantity and delivery destination
- Any special testing, certification, or packaging requirements