JIS G3459 SUS 309 TP Stainless Steel Pipe
SUS 309 TP Stainless Steel Pipe: JIS G3459 Austenitic Heat-Resistant Alloy
Comprehensive technical data for SUS 309 TP stainless steel pipe under JIS G3459, including chemical composition, mechanical and physical properties, international equivalents, and application guidance for high-temperature service.
Hot rolling, cold drawing, welding (TIG, MIG, plasma), bending, machining
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JIS G3459 SUS 309 TP Stainless Steel Pipe Introduction
SUS 309 TP is an austenitic stainless steel pipe grade specified in JIS G3459, primarily designed for elevated-temperature service with excellent oxidation resistance up to 1000°C (1832°F). It contains approximately 22–24% chromium and 12–15% nickel, providing a stable austenitic structure and superior resistance to high-temperature corrosion and scaling. Compared to standard 18-8 grades, SUS 309 TP offers significantly better strength and oxidation resistance at high temperatures, making it suitable for furnace components, heat exchangers, and piping systems exposed to combustion gases. The grade is typically supplied in the solution-annealed condition to ensure maximum ductility and corrosion resistance. Its combination of good weldability and fabrication characteristics allows for use in demanding thermal and chemical environments.
JIS G3459 SUS 309 TP Stainless Steel Pipe Chemical Composition
Based on JIS G3459 requirements for austenitic SUS 309 TP pipe. Elements are specified as mass fractions. The composition ensures a fully austenitic microstructure with enhanced high-temperature strength and oxidation resistance. Deviations within the specified ranges are acceptable as per the standard.
| Element | Standard Value (wt%) | Remarks |
|---|---|---|
| Carbon (C) | ≤0.20 | Max limit for austenitic structure |
| Silicon (Si) | ≤1.00 | Improves oxidation resistance |
| Manganese (Mn) | ≤2.00 | Austenite stabilizer |
| Phosphorus (P) | ≤0.040 | Residual element |
| Sulfur (S) | ≤0.030 | Residual element |
| Nickel (Ni) | 12.00–15.00 | Primary austenite former |
| Chromium (Cr) | 22.00–24.00 | Provides oxidation and corrosion resistance |
| Iron (Fe) | Balance | Remainder |
JIS G3459 SUS 309 TP Stainless Steel Pipe Thermal and Electrical Physical Properties
Physical properties for SUS 309 TP in the annealed condition. These are typical values for 25Cr-12Ni austenitic stainless steel and may vary slightly with manufacturing process and temperature. Properties are essential for design calculations in high-temperature applications.
| Property | Typical Value | Unit | Test Condition / Temperature |
|---|---|---|---|
| Density (ρ) | 7.98 | g/cm³ | 20°C |
| Elastic Modulus (E) | 193 | GPa | 20°C |
| Shear Modulus (G) | 74 | GPa | 20°C |
| Poisson's Ratio (ν) | 0.30 | – | 20°C |
| Thermal Expansion (α) | 14.9 | 10⁻⁶/K | 20–100°C |
| Thermal Expansion (α) | 16.7 | 10⁻⁶/K | 20–300°C |
| Thermal Expansion (α) | 18.0 | 10⁻⁶/K | 20–500°C |
| Thermal Expansion (α) | 19.3 | 10⁻⁶/K | 20–700°C |
| Thermal Conductivity (λ) | 15.0 | W/(m·K) | 100°C |
| Thermal Conductivity (λ) | 18.8 | W/(m·K) | 500°C |
| Specific Heat Capacity (c) | 500 | J/(kg·K) | 20°C |
| Electrical Resistivity (ρ_e) | 0.78 | µΩ·m | 20°C |
JIS G3459 SUS 309 TP Stainless Steel Pipe Mechanical Properties
Mechanical properties according to JIS G3459 for solution-annealed austenitic stainless steel pipe. Values are minimum requirements unless otherwise noted. Elongation depends on wall thickness. Test specimens are taken longitudinally for wall thickness ≤19.05 mm; transverse specimens may be used for thinner walls.
| Property | Required Value | Unit | Test Condition |
|---|---|---|---|
| Tensile Strength (Rm) | ≥520 | MPa | Room temperature, longitudinal |
| Yield Strength (ReH, 0.2% offset) | ≥205 | MPa | Room temperature, longitudinal |
| Elongation (A) | ≥35 | % | Wall thickness ≤7.94 mm, longitudinal gauge 50 mm |
| Elongation (A) | ≥30 | % | Wall thickness >7.94 mm, longitudinal gauge 50 mm |
| Hardness (HRB / HBW) | ≤90 HRB / ≤200 HBW | – | For reference only, not mandatory in pipe standard |
JIS G3459 SUS 309 TP Stainless Steel Pipe Internationally Equivalent Standards and Replaceable Grades
| Country/Region | Standard | Grade | Remark |
|---|---|---|---|
| USA | ASTM A312/A312M | TP309 | Seamless and welded pipe, identical chemical range (C ≤0.20, Cr 22-24, Ni 12-15) |
| China | GB/T 14976 | 0Cr23Ni13 (06Cr23Ni13) | Similar chemistry but often lower carbon; check C max 0.08 vs 0.20 |
| Europe | EN 10217-7 | 1.4828 (X15CrNiSi20-12) | Close match, but slightly different Cr and Ni range; verify for high-temperature use |
| International | ISO 2604-2 | TS60 | Equivalent to ASTM TP309, suitable for pressure purposes |
JIS G3459 SUS 309 TP Stainless Steel Pipe Application Introduction
SUS 309 TP pipe is optimized for high-temperature structural and fluid transport applications where oxidation resistance and strength retention are critical. It is widely used in industrial heating equipment, power generation, and chemical processing. Key features:
- Excellent resistance to oxidation up to 1000°C in continuous service
- Good strength at elevated temperatures compared to 304/316 types
- Resistant to carburization and reducing sulfur atmospheres
- Readily welded by common fusion methods, no post-weld heat treatment required for most service conditions
- Not recommended for wet corrosion environments with high chloride content due to susceptibility to stress corrosion cracking
Product Applications: High-temperature steam and gas piping systems, Heat exchanger tubes and headers, Furnace components (radiant tubes, burner pipes), Expansion joints and bellows, Exhaust gas recirculation (EGR) pipes, Ethylene cracking furnace tubes
Processed into products: Superheater and reheater tubes, Radiant coils and U-bends, Thermal oxidizer pipes, Annealing furnace muffles and rollers, Flue gas ducts, Oil refinery heater tubes, Induction heating coil supports
Application industries: Petrochemical and refinery, Power generation (boilers, superheaters), Industrial furnace manufacturing, Heat treatment equipment, Chemical processing, Waste incineration plants
JIS G3459 SUS 309 TP Stainless Steel Pipe Analogous / Similar Substitute Materials
| Country/Region | Standard | Grade | Remark |
|---|---|---|---|
| Japan | JIS G3459 | SUS 310S TP | Higher Cr and Ni (24-26 Cr, 19-22 Ni) for superior oxidation resistance up to 1100°C |
| USA | ASTM A312/A312M | TP310S | Similar to above, low carbon variant |
| Europe | EN 10217-7 | 1.4845 (X8CrNi25-21) | Higher alloyed for extreme temperatures |
| China | GB/T 14976 | 0Cr25Ni20 (06Cr25Ni20) | Enhanced scale resistance, substitute when higher temperature capability needed |
Notes:
SUS 309 TP as per JIS G3459 is intended for high-temperature service and not for general corrosion resistance in wet environments. Welding: Use matching filler metal (e.g., ER309) to maintain oxidation resistance. Heat treatment: Solution annealing at 1040–1120°C with rapid air or water cooling is recommended after severe forming or welding for stress relief and restoration of properties. Prolonged exposure in the 550–850°C range may cause sigma phase embrittlement; operate outside this range for optimum service life. Compliance with the standard requires verification of both mechanical properties and chemical composition on finished pipes.
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