SUS 347 TP Stainless Steel Pipe
SUS 347 TP Stainless Steel Pipe: High-Temperature Austenitic Alloy per JIS G3459
Comprehensive technical data for SUS 347 TP stainless steel pipe according to JIS G3459, including chemical composition, mechanical and thermal properties, equivalent grades, and application areas.
Hot working, cold working, bending, welding, solution annealing (≥1040°C/quenching), pickling
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SUS 347 TP Stainless Steel Pipe Introduction
SUS 347 TP is a niobium-stabilized austenitic stainless steel pipe grade defined in JIS G3459. It offers excellent resistance to intergranular corrosion after exposure to temperatures in the chromium carbide precipitation range (427–816°C) due to the addition of niobium, which preferentially forms carbides. This material exhibits good high-temperature strength, oxidation resistance, and corrosion resistance in many chemical and petrochemical environments. It is widely used for boiler tubes, superheater tubes, heat exchangers, and high-temperature piping systems where thermal stability and resistance to sensitization are required. The pipe is supplied in the solution-annealed condition, ensuring a fully austenitic microstructure with optimum ductility and toughness.
SUS 347 TP Stainless Steel Pipe Chemical Composition
The chemical composition of SUS 347 TP complies with JIS G3459 and is identical to that of SUS 347 in JIS G4303. Niobium is added to stabilize carbon and prevent intergranular corrosion. The Nb content must be at least 10 times the carbon content, with a maximum limit of 1.10%.
| Element | Standard Value | Remarks |
|---|---|---|
| Carbon (C) | ≤0.08 | |
| Silicon (Si) | ≤1.00 | |
| Manganese (Mn) | ≤2.00 | |
| Phosphorus (P) | ≤0.045 | |
| Sulfur (S) | ≤0.030 | |
| Nickel (Ni) | 9.00–13.00 | |
| Chromium (Cr) | 17.00–19.00 | |
| Niobium (Nb) | 10×C% – 1.10 | Nb+Ta ≥ 10×C% |
SUS 347 TP Stainless Steel Pipe Thermal and Electrical Physical Properties
The following physical properties are typical for SUS 347 (equivalent to 1.4550/TP347) in the annealed condition. These values are collected from authoritative sources and are suitable for general engineering calculations.
| Property | Standard Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 8.0 | g/cm³ | Room temperature |
| Modulus of elasticity (E) | 193 | GPa | Room temperature |
| Shear modulus (G) | 77 | GPa | Room temperature |
| Poisson's ratio (ν) | 0.28 | – | Room temperature |
| Thermal expansion coefficient (α) | 16.5 | 10⁻⁶/K | 0–100°C |
| Thermal expansion coefficient (α) | 17.5 | 10⁻⁶/K | 0–315°C |
| Thermal expansion coefficient (α) | 18.5 | 10⁻⁶/K | 0–538°C |
| Thermal conductivity (λ) | 16.2 | W/m·K | 100°C |
| Thermal conductivity (λ) | 21.5 | W/m·K | 500°C |
| Specific heat capacity | 500 | J/kg·K | 0–100°C |
| Electrical resistivity (ρ_e) | 72 | μΩ·cm | 20°C |
SUS 347 TP Stainless Steel Pipe Mechanical Properties
Mechanical properties are specified in JIS G3459 for the solution-annealed condition at room temperature. The tensile test is performed on a longitudinal specimen. The elongation requirement depends on the wall thickness of the pipe.
| Property | Standard Required Value | Unit | Test Condition |
|---|---|---|---|
| Yield strength (Rp0.2) | ≥205 | MPa | Room temperature, solution annealed |
| Tensile strength (Rm) | ≥520 | MPa | Room temperature, solution annealed |
| Elongation (A) | ≥20 | % | Longitudinal, wall thickness t ≤8 mm |
| Elongation (A) | ≥25 | % | Longitudinal, wall thickness t >8 mm |
SUS 347 TP Stainless Steel Pipe Fully Equivalent Material Standards and Substitutable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| United States | ASTM A312 | TP347 | Identical composition and application; seamless and welded pipe |
| Europe | EN 10216-5 | 1.4550 / X6CrNiNb18-10 | Stabilized grade for high-temperature service |
| China | GB/T 14976 | 06Cr18Ni11Nb (S34779) | Equivalent to JIS SUS 347 TP |
| International | ISO 9329-5 | X6CrNiNb18-10 | Technically identical |
SUS 347 TP Stainless Steel Pipe Application Introduction
SUS 347 TP pipe is optimized for environments where resistance to intergranular corrosion and sustained high-temperature strength are critical. Its niobium stabilization prevents sensitization during welding or prolonged heating, making it ideal for aggressive chemical streams and thermal cycling.
Product Applications: Boiler tubes and superheater tubes, Heat exchanger tubes and tube sheets, High-temperature process piping systems, Expansion joints and bellows, Instrument tubing and thermowells
Processed into products: Tube bundles for heat recovery steam generators (HRSG), Furnace components and radiant tubes, Corrosion-resistant piping spools in chemical transport, Welded assemblies in exhaust manifolds, Thermowells for high-temperature sensors
Application industries: Oil & Gas (refineries, petrochemical plants), Chemical Processing (reactors, columns, piping), Power Generation (boilers, superheaters, reheaters), Heat Exchanger Manufacturing, Nuclear Engineering (secondary systems)
SUS 347 TP Stainless Steel Pipe Similar / Alternative Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G3459 | SUS 321 TP | Titanium-stabilized austenitic steel; similar intergranular corrosion resistance, slightly lower high-temperature strength |
| United States | ASTM A312 | TP321 | Stabilized with Ti; can be considered for moderate high-temperature applications |
| Europe | EN 10216-5 | 1.4541 / X6CrNiTi18-10 | Ti-stabilized analogue; lower cost but narrower temperature range |
| Japan | JIS G3459 | SUS 347H TP | Higher carbon version (0.04–0.10% C) for improved creep strength at elevated temperatures |
Notes:
The actual material may be supplied with optional additional requirements such as intergranular corrosion testing (e.g., per ASTM A262 practice E), nondestructive testing, or enhanced surface finish. The user should refer to the relevant standard for supplementary specifications.
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