Stainless Steel Coil Tube — JIS G3463 Boiler & Heat Exchanger Grade
Product Overview
The JIS G3463 Stainless Steel Coil Tube (盘管 / Coil Tube) is a precision-engineered, continuous-length tubular product manufactured in accordance with the Japanese Industrial Standard (JIS) G3463 — "Stainless Steel Tubes for Boilers and Heat Exchangers." Designed as the Japanese counterpart to the internationally recognized ASTM A213 (Stainless Steel Tubing for Boilers, Heat Exchangers, and Similar Heat Absorbing Applications) and ASTM A269 (General Requirements for Stainless Steel Seamless and Welded Austenitic Tubing), this product delivers superior corrosion resistance, thermal efficiency, and mechanical integrity under demanding thermal cycling conditions.
Manufactured by Wenzhou Jixing Metal Materials Co., Ltd, this coil tube product is supplied in continuous coil configuration, enabling downstream users to perform on-site cut-to-length processing, reducing material waste and optimizing fabrication efficiency. The coil format is particularly advantageous for heat exchanger manufacturing lines requiring high-volume, continuous tube-forming and U-bend operations.
Material & Properties
JIS G3463 specifies a range of austenitic and austenitic-ferritic stainless steel grades suitable for high-temperature and corrosive service environments. The primary material grades include:
- SUS304 / SUS304L — Corresponding to ASTM 304/304L; general-purpose austenitic grade with excellent weldability and corrosion resistance in non-chloride environments.
- SUS316 / SUS316L — Corresponding to ASTM 316/316L; molybdenum-enhanced grade offering superior resistance to pitting and crevice corrosion in chloride-containing media.
- SUS310 / SUS310S — High-temperature austenitic grade suitable for sustained service temperatures up to 1150°C.
- SUS321 / SUS347 — Stabilized austenitic grades (titanium-stabilized and niobium-stabilized respectively) resistant to intergranular corrosion after welding.
- SUS316Ti / SUS316J1 — Titanium-stabilized 316 variants for enhanced resistance to sensitization.
Key Mechanical Properties (Typical for SUS304 at Room Temperature):
- Tensile Strength (抗拉强度): ≥ 520 MPa
- Yield Strength (屈服强度, 0.2% offset): ≥ 205 MPa
- Elongation (延伸率): ≥ 40%
- Hardness (硬度): ≤ 210 HB
- Thermal Conductivity (热导率): ~16 W/(m·K) at 100°C
- Linear Expansion Coefficient (线膨胀系数): ~17.3 × 10⁻⁶ /K (20–100°C)
Specifications
| Parameter | Specification / Range | Remarks |
|---|---|---|
| Applicable Standard (适用标准) | JIS G3463 | Japanese Industrial Standard for boiler & heat exchanger tubes |
| Equivalent Standards (对应标准) | ASTM A213 / ASTM A269 | Japanese-version equivalent |
| Product Form (产品形态) | Coil Tube (盘管) | Continuous coil configuration |
| Outer Diameter (外径, OD) | 6.0 mm – 50.8 mm (typical) | Custom OD available upon request |
| Wall Thickness (壁厚, WT) | 0.40 mm – 3.00 mm (typical) | Tolerance per JIS G3463 |
| Material Grades (材质牌号) | SUS304, SUS304L, SUS316, SUS316L, SUS310, SUS321, SUS347, SUS316Ti | Per JIS G3463 material schedule |
| Manufacturing Method (制造工艺) | Seamless (无缝) / Welded (焊接) | Seamless preferred for high-pressure service |
| Surface Condition (表面状态) | Pickled & Annealed (酸洗钝化) / Bright Annealed | Ra ≤ 0.8 μm achievable |
| Heat Treatment (热处理) | Solution Annealing (固溶处理) at 1010–1150°C, followed by water quench | Ensures full austenitic microstructure |
| Maximum Service Temperature (最高使用温度) | Up to 870°C (SUS304/316); Up to 1150°C (SUS310) | Grade-dependent |
| Coil Weight (盘管重量) | Typically 500 kg – 2,000 kg per coil | Customizable |
| Dimensional Tolerance (尺寸公差) | Per JIS G3463 Table 3 (OD: ±0.10 mm; WT: ±10%) | Tight tolerance available on request |
| Hydrostatic Test (水压试验) | 100% hydrostatic testing per JIS G3463 | Test pressure specified in standard |
Manufacturing Process
The production of JIS G3463 stainless steel coil tubes follows a rigorous multi-stage manufacturing workflow designed to ensure dimensional accuracy, metallurgical integrity, and surface quality:
- Raw Material Selection (原材料选择): Virgin stainless steel billets or slabs conforming to JIS G4305 (Chemical Composition and Mechanical Properties of Steel Bars, Wires, and Forgings) are procured and inspected for chemical composition compliance via spectroscopic analysis (光谱分析).
- Hot Rolling / Hot Extrusion (热轧/热挤压): The billet is heated to forging temperature (1050–1200°C) and processed into a hollow tube blank via either hot rolling (for seamless production) or hot extrusion through a shaped die.
- Cold Drawing / Cold Reduction (冷拔/冷轧): The hot-rolled tube is subsequently cold-drawn through a series of progressively reducing dies to achieve the final OD and wall thickness dimensions with tight tolerances. This step refines the grain structure and improves surface finish.
- Solution Annealing (固溶退火): The cold-worked tube is reheated to 1010–1150°C in a controlled atmosphere furnace, held for sufficient time to dissolve carbides and restore full austenitic microstructure, then rapidly quenched in water. This eliminates cold-work hardening and restores ductility.
- Pickling & Descaling (酸洗除鳞): The annealed tube is immersed in a mixed acid bath (nitric acid + hydrofluoric acid) to remove oxide scale and restore the natural chromium-rich passive layer on the surface.
- Hydrostatic Testing (水压试验): Each coil length undergoes 100% hydrostatic pressure testing at pressures exceeding the specified test pressure per JIS G3463, ensuring freedom from internal defects, leaks, and wall thinning.
- Coiling (成盘): The tested tube is wound onto precision-wound coils using automated coiling equipment to prevent surface scratching, deformation, or kinking during winding.
- Final Inspection & Packaging (终检与包装): Final dimensional verification, surface inspection, and chemical/mechanical property certification are performed. Coils are packaged with protective wrapping and steel bands for shipment.
Applications
The JIS G3463 stainless steel coil tube is specifically engineered for thermal-fluid exchange applications across multiple industries:
- Power Generation (发电): Boiler tubes, superheater tubes, reheater tubes, and economizer tubes in fossil-fuel and nuclear power plants.
- Petrochemical & Refining (石油化工): Heat exchanger tubes in distillation columns, condensers, evaporators, and reboilers handling corrosive hydrocarbon streams.
- Marine & Offshore (海洋工程): Condenser tubes and heat exchangers in marine propulsion systems, ballast water treatment, and offshore platform cooling circuits.
- Food & Pharmaceutical Processing (食品与制药): Sanitary heat exchangers, pasteurization systems, and CIP (Clean-In-Place) compatible thermal processing equipment.
- Automotive & HVAC (汽车与暖通空调): Intercoolers, radiators, and air conditioning evaporator/condenser tubes.
- Chemical Processing (化工): Heat exchangers handling aggressive chemical media including acids, alkalis, and chlorinated solutions (particularly SUS316/SUS316L grades).
Quality Certifications & Compliance
Wenzhou Jixing Metal Materials Co., Ltd maintains a comprehensive quality assurance framework ensuring full traceability and compliance with international standards:
- JIS G3463 Full Compliance: All material grades, chemical compositions, mechanical properties, dimensional tolerances, and testing protocols conform strictly to the Japanese Industrial Standard JIS G3463.
- ASTM A213 / ASTM A269 Equivalence: Products are certified as equivalent to the corresponding ASTM specifications, facilitating global project acceptance.
- ISO 9001:2015 Quality Management System: Certified manufacturing and quality control processes ensuring consistent product quality.
- Mill Test Certificates (MTC): Every shipment is accompanied by a full EN 10204 3.1 Mill Test Certificate detailing chemical analysis, mechanical test results, and heat number traceability.
- Third-Party Inspection: Available upon request from recognized inspection bodies (e.g., SGS, Bureau Veritas, DNV).
- NDT Testing (无损检测): Eddy current testing (涡流检测) and/or ultrasonic testing (超声波检测) available for defect detection in accordance with applicable standards.
Unique Selling Points
- Coil Configuration Advantage: Supplied in continuous coil form, enabling downstream fabricators to perform automated cut-to-length, U-bending, and tube-forming operations without the handling and joint risks associated with straight-length tube. Reduces material waste by up to 15% compared to straight lengths.
- Dual-Standard Compliance: Simultaneous JIS G3463 and ASTM A213/A269 equivalence provides flexibility for projects governed by Japanese, American, or international specifications.
- Full Grade Coverage: Comprehensive availability of SUS304 through SUS310 grades ensures optimal material selection for any thermal and corrosion service condition.
- 100% Hydrostatic Testing: Every coil undergoes complete hydrostatic pressure testing, providing absolute assurance of structural integrity and leak-tightness.
- Custom Dimensional Capability: Non-standard OD, wall thickness, and coil weight configurations available to meet specific project requirements.
- Traceability & Documentation: Full heat-number traceability with EN 10204 3.1 MTC ensures complete compliance with international procurement and regulatory requirements.
Note: This product specification is based on JIS G3463 ("Stainless Steel Tubes for Boilers and Heat Exchangers") as issued by the Japanese Industrial Standards Committee. For detailed grade-specific chemical composition requirements, dimensional tolerances, and testing protocols, refer to the current edition of JIS G3463. All products manufactured by Wenzhou Jixing Metal Materials Co., Ltd are subject to the company's internal quality management procedures which exceed minimum standard requirements.