
ASTM A269 Type 347 Stainless Steel Tube
1. Standard: ASTM A269, ASME SA269
2. OD Size: 1/8" OD - 48" OD
3. Wall Thickness: 0.40 mm - 12.70 mm
4. Equivalent: UNS S34700, DIN 1.4550, AISI 347
ASTM A269 Type 347 Stainless Steel Tube is a stabilized Nb-containing alloy. UNS S34700 has good general corrosion resistance and slightly better corrosion resistance than 321 (UNS S32100) in strong oxidizing conditions. It is also resistant to corrosion in many organic and inorganic acids such as acetic, sulfuric and phosphoric acids. It has excellent resistance to intergranular corrosion after exposure to temperatures of 800 – 1500°F (427 – 816°C) where chromium carbides precipitate. We are a SS 347 supplier with 15+ years of export experience, contact us for more information and a free quote!
ASTM A269 Type 347 Stainless Steel Tube Standard:
- ASTM A269: Standard Specification for Seamless and Welded Austenitic Stainless Steel Tubing for General Service
- ASTM A249: Standard Specification for Welded Austenitic Steel Boiler, Superheater, Heat Exchanger, and Condenser Tubes
- Available forms for 347: Fittings, Flanges, Forgings, Fasteners, Pipes, Plates, Sheets, Strips, Coils, Bars, Round Rods, Etc.

347 SS Tubing Chemical Composition:
- Chromium (Cr): 17-20%
- Nickel (Ni): 9-13%
- Manganese (Mn): 2% (max)
- Silicon (Si): 0.75% (max)
- Carbon (C): 0.08% (max)
- Phosphorus (P): 0.045% (max)
- Sulfur (S): 0.03% (max)
- Niobium (Nb): 10xC - 1.10% (max)
Mechanical Properties of Type 347 Stainless Steel Tube:
- Tensile Strength: 515 MPa (75,000 psi) at room temperature
- Yield Strength: 205 MPa (30,000 psi) at room temperature
- Elongation: 40% (50 mm) at room temperature
- Hardness: Brinell hardness is about 160 (changes with heat treatment)
Alloy 347 Stainless Steel Tubing Applications
- High Temperature Equipment
- Chemical Processing
- Aerospace Components
- Exhaust Systems
ASTM A269 Gr 347 SS Tube High Temperature:
It can withstand prolonged exposure up to 800°C (1470°F) without losing its mechanical properties.
UNS S34700 Stainless Steel Weldability:
Stainless Steel 347 exhibits good weldability using common welding techniques such as GTAW (TIG), GMAW (MIG/MAG), and SMAW (electrode).
WNR. 1.4550 Stainless Surface Treatment:
Common surface treatments are annealing pickling, bright annealing, polishing, etc.
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