Stainless Steel 347 tubes Manufacturer and Supplier
USA Piping Solution is a worldwide trusted manufacturer, stockist and supplier of Stainless Steel 347 Tubes or SS 347 Tubes. Grade 347 is a niobium and tantalum stabilized austenitic stainless steel, which has been found to be very resistant to sensitization and intergranular corrosion when used in welded structures and in the HAZ. Our SS 347 Tubes are used widely in the industries of petrochemical processing, power generation, heat exchanger, boilers and in aerospace industries, and are offered as seamless and welded. We can provide these tubes to ASTM A213, ASTM A249, ASTM A269, and ASTM A511 standards. All tubes are produced with a rigorous quality management system and are accompanied by full material test certificates, dimensional inspection certificates and third party inspection as needed.
Stainless Steel 347 tubes Specifications
Parameter | Details |
|---|---|
Grade | SS 347 / SS 347H |
Standard | ASTM A213 / ASME SA213, ASTM A249 / ASME SA249, ASTM A269, ASTM A511 |
Form | Seamless and Welded (EFW / ERW) |
Outer Diameter (OD) | 6.35 mm to 101.6 mm |
Wall Thickness (WT) | 0.5 mm to 10 mm |
Length | 1 m to 6 m, random, fixed, cut to length |
Schedule | SCH 5, SCH 10, SCH 20, SCH 40, SCH 80, SCH 160, XXS |
End Finish | Plain End, Beveled End, Threaded End |
Surface Finish | 2B, No. 4, No. 8, BA, Electropolished, Pickled and Annealed |
Hardness | 217 HB max / 95 HRB max |
Test Certificates | EN 10204 3.1 / 3.2, Mill Test Certificate, Third Party Inspection |
Testing | Hydrostatic, Flattening, Eddy Current, IGC Test, PMI Test |
Types of Stainless Steel 347 Tubes
Need a mill test certificate matched to this spec?
Request your SS 347 Tube quote with EN 10204 3.1 documentation.
Get a QuoteChemical Composition of SS 347 Tubes
Element | SS 347 | SS 347H |
|---|---|---|
Carbon (C) | 0.08% max | 0.04 to 0.10% |
Manganese (Mn) | 2.00% max | 2.00% max |
Silicon (Si) | 0.75% max | 0.75% max |
Phosphorus (P) | 0.045% max | 0.045% max |
Sulfur (S) | 0.030% max | 0.030% max |
Chromium (Cr) | 17.00 to 19.00% | 17.00 to 19.00% |
Nickel (Ni) | 9.00 to 13.00% | 9.00 to 13.00% |
Niobium + Tantalum (Nb + Ta) | 10 x C min, 1.10% max | 8 x C min, 1.10% max |
Mechanical Properties of SS 347 Tubes
Property | SS 347 | SS 347H |
|---|---|---|
Tensile Strength (min) | 515 MPa (75 ksi) | 515 MPa (75 ksi) |
Yield Strength 0.2% proof (min) | 205 MPa (30 ksi) | 205 MPa (30 ksi) |
Elongation in 2 in. (min) | 40% | 40% |
Hardness (Brinell) | 217 HB max | 217 HB max |
Hardness (Rockwell B) | 95 HRB max | 95 HRB max |
Physical Properties of Stainless Steel 347 tubes
Property | Value |
|---|---|
Density | 8.0 g/cm3 |
Melting Point | 1400 to 1425 deg C |
Thermal Conductivity | 16.2 W/m.K at 100 deg C |
Coefficient of Thermal Expansion | 17.2 x 10-6 /K (0 to 100 deg C) |
Specific Heat Capacity | 500 J/kg.K |
Electrical Resistivity | 0.73 x 10-6 Ohm.m |
Modulus of Elasticity | 193 GPa |
Stainless Steel 347 tubes Equivalent Grades
Standard | Equivalent Grade |
|---|---|
UNS | S34700 |
ASTM / ASME | SS 347 |
DIN | 1.4550 |
EN | X6CrNiNb18-10 |
JIS | SUS347 |
BS | 347S31 |
AFNOR | Z6CNNb18-10 |
Applications of SS 347 Tubes
- Petrochemical: Refinery process piping, high temperature fluid handling
- Power Generation: Superheater tubes, reheater tubes, steam lines
- Aerospace: Exhaust collectors, jet engine parts, aircraft tubing
- Heat Exchangers: Shell and tube heat exchangers, U-tube bundles
- Chemical Processing: Reactor vessels, chemical transfer lines, pressure vessels
- Food and Beverage: Hygienic processing piping, aseptic transfer lines
- Pharmaceuticals: Clean steam lines, process piping
- Nuclear: Nuclear fuel element cladding, coolant tubes
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Frequently Asked Questions
What is the minimum order quantity for SS 347 Tubes?
We don't enforce a fixed MOQ. Small trial orders and large bulk project quantities are both accommodated, with pricing adjusted based on size, schedule, and total order volume.
Can SS 347 Tubes be supplied with mill test certificates?
Yes. Every order ships with EN 10204 3.1 mill test certificates as standard, and 3.2 third-party witnessed certificates are available on request for critical applications.
What is the typical lead time for SS 347 Tube orders?
Stock sizes typically ship within 3 to 7 working days. Custom OD, wall thickness, or length combinations usually take 4 to 6 weeks depending on order quantity.
Do you ship SS 347 Tubes internationally?
Yes, we regularly export SS 347 Tubes to customers across the USA, Europe, the Middle East, and Asia, with export packing and full documentation included.
Request a Quote for Stainless Steel 347 Tubes
Contact USA Piping Solution for competitive pricing, fast delivery, and complete test certification on all SS 347 Tubes and SS 347H Tubes. We serve customers across the USA, Europe, the Middle East, and Asia.
Get a Quote