347 Stainless Steel Tube
Stellanox Steel offers top-quality 347 Stainless Steel Tubes, designed to perform under high-temperature and corrosive environments where standard austenitic grades like 304 and 316 fall short. Stabilized with niobium (columbium), 347 stainless steel tubes are ideal for use in heat exchangers, chemical processing, high-pressure steam lines, and aerospace components where resistance to intergranular corrosion and creep is essential.
Engineered for demanding industries, these tubes ensure long-term reliability in extreme heat and cyclic thermal conditions.
What is 347 Stainless Steel Tube?
347 Stainless Steel Tubes are austenitic chromium-nickel stainless steel products alloyed with niobium (Nb) to stabilize against chromium carbide precipitation. This stabilization enhances resistance to intergranular corrosion caused by welding or high-temperature service.
With excellent mechanical strength, oxidation resistance, and creep resistance, 347 tubes are widely used in aircraft engine components, thermal oxidizers, and refinery heaters operating at elevated temperatures.
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Stainless Steel |
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Carbon Steel |
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Duplex Stainless Steel |
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Super Duplex Stainless Steel |
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Alloy Steel |
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Titanium |
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Hastelloy |
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Inconel |
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Monel |
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Aluminium |
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Copper |
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Pure Nickel |
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Flanges |
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Forged Fittings |
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Valves |
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Fasteners |
Key Features of 347 Stainless Steel Tube
- Nb-Stabilized Against Sensitization: Prevents carbide formation at grain boundaries during welding or heat exposure.
- Outstanding High-Temperature Strength: Suitable for continuous service up to 900°C.
- Excellent Oxidation & Creep Resistance: Ideal for cyclic heating or pressure conditions.
- Superior Weldability: No risk of post-weld intergranular corrosion.
- Non-Magnetic in Annealed Condition: Suitable for instrumentation and structural use.
- Extended Service Life in Harsh Conditions: Withstands acids, high pressure, and stress loads.
Specification Chart – 347 Stainless Steel Tube
| Property | Details |
|---|---|
| Grade | 347 (UNS S34700) |
| Standards | ASTM A213, A312, A269, A249 |
| Size Range (OD) | 6 mm to 219 mm |
| Wall Thickness | 0.5 mm to 12 mm |
| Tube Types | Seamless, Welded, Cold Drawn, U-Bend |
| Surface Finishes | 2B, Bright Annealed, Polished, Pickled |
| End Types | Plain End (PE), Beveled End (BE), Threaded End |
| Certifications | EN 10204 3.1 / 3.2, ISO, PED, NACE MR0175 |
Chemical Composition – 347 Stainless Steel Tube
| Element | Composition (%) |
|---|---|
| Chromium | 17.0 – 19.0 |
| Nickel | 9.0 – 13.0 |
| Carbon | ≤ 0.08 |
| Manganese | ≤ 2.0 |
| Silicon | ≤ 0.75 |
| Phosphorus | ≤ 0.045 |
| Sulfur | ≤ 0.030 |
| Niobium + Tantalum | ≥ 10 x C (min) to ≤ 1.10 |
| Iron | Balance |
Mechanical Properties – 347 Stainless Steel Tube
| Property | Value |
|---|---|
| Tensile Strength (MPa) | ≥ 515 |
| Yield Strength (MPa) | ≥ 205 |
| Elongation (%) | ≥ 40 |
| Hardness (HRB) | ≤ 95 |
| Modulus of Elasticity | 193 GPa |
| Density | 7.90 g/cm³ |
Equivalent Grades
| Standard | Grade |
|---|---|
| ASTM | 347 |
| EN | 1.4550 |
| JIS | SUS 347 |
| UNS | S34700 |
| DIN | X6CrNiNb18-10 |
347 Stainless Steel Tube Weight Chart
| OD (mm) | Wall Thickness (mm) | Weight per Meter (kg) | Weight per 6m (kg) |
|---|---|---|---|
| 12.7 | 1.2 | 0.28 | 1.68 |
| 19.05 | 1.5 | 0.50 | 3.00 |
| 25.4 | 2.0 | 0.95 | 5.70 |
| 38.1 | 2.5 | 1.71 | 10.26 |
| 50.8 | 3.0 | 2.78 | 16.68 |
| 63.5 | 3.0 | 3.53 | 21.18 |
| 76.2 | 3.5 | 4.92 | 29.52 |
Applications of 347 Stainless Steel Tube
- Heat exchangers and furnace tubing
- High-temperature chemical process lines
- Power plant boiler and steam systems
- Petrochemical refinery heaters
- Aerospace exhaust systems
- Thermal oxidizers and expansion joints
- Engine manifolds and pressure tubing
Benefits of 347 Stainless Steel Tube
- Long-lasting performance in extreme heat and stress
- No post-weld heat treatment needed
- Strong resistance to intergranular corrosion
- Maintains integrity under pressure and creep
- Non-magnetic and corrosion-resistant
- Versatile for both structural and fluid transport applications
2025 Stellanox Steel |