347 Stainless Steel Small Diameter Tubing
Manufacturing Process: Seamless, Welded
Surface Treatment: Bright Annealing, Pickling, Electrolytic Polishing
Tube End Finishing: Plain Cut, Deburred or Beveled
Length Options: 6 m, 5.8 m, customizable
Outer Diameter (OD): 1.60 mm – 12.70 mm (0.063" – 0.500")
Wall Thickness (WT): 0.20 mm – 2.00 mm (0.008" – 0.079")
Shipping Packaging: Standard seaworthy export packaging or customized as client requirements
Applicable Standards: ASTM, JIS, EN, GB, DIN, KS, ANSI, SUS
Place of Origin: China
Manufacturer of 347 SS Small Diameter Tubing
In addition, we also provide a range of value-added product services, detailed as follows:
✅Precision processing: fixed-length cutting, pipe end beveling/bending, punching and non-standard size customization
✅Surface treatment: polishing, pickling & passivation, wire drawing and other processes
✅ Foreign trade supporting services: customized moisture-proof export packaging, small-batch customization, free sample provision and working condition selection technical guidance
✅ Seamless or welded options with full traceability (EN 10204 3.1 / 3.2)
✅ Short lead times & global deliver
Looking for reliable SS 347 small OD tubing for aerospace, chemical, or high-temperature systems?We supply both standard stock sizes and custom-engineered tubing to fit your project.Contact Gnee!
specification of 347 SS Small Diameter Tubing
Chemical Composition Limits
| Weight% | C | P | Si | Ni | Mn | S | Cr | Cb + Ta | Fe | Mo | Cu |
| 347 Tube | 0.08 max | 0.040 max | 1.00 max | 9-12 | 2.0 max | 0.030 max | 17-19 | 10 x C min | Bal | 0.75 max | 0.75 max |
Typical Mechanical Properties
| Material | 0.2% Offset Yield Strength | Ultimate Tensile Strength | % Elongation in 2" (50.8mm) | Hardness Brinell (Plate) |
| 347 Tube | 30,000 psi 205 MPa |
75,000 psi 515 MPa |
40 | 201 |
Physical properties for Type 347 stainless steel
| Property | 347 Data |
| Density, lb/in3 | 0.288 |
| Modulus of Elasticity, psi | 28.0 x 106 |
| Coefficient of Thermal Expansion, 68-212˚F, /˚F | 9.3 x 10-6 |
| Thermal Conductivity, Btu/ft hr ˚F | 9.2 |
| Specific Heat, Btu/lb ˚F | 0.12 |
| Electrical Resistivity, Microohm-in | 28.4 |
Equivalent Grades of Stainless Steel 347 Pipe & Tube
| STANDARD | WERKSTOFF NR. | UNS | JIS | GOST | EN |
| SS 347 | 1.4550 | S34700 | SUS 347 | 08Ch18N12B | X6CrNiNb18-10 |
Dimensional Tolerance of 347 Stainless Steel Pipes
1.Outer diameter tolerance: For small-diameter pipes, the conventional tolerance is within ±0.1 mm, and tighter tolerances are available for custom precision models to guarantee assembly accuracy for compact equipment.
2.Wall thickness tolerance: Controlled with a lower limit of -12.5% of the nominal wall thickness as standard, ensuring the minimum measured wall thickness meets requirements for pressure-bearing pipelines.
price of 347 Stainless Steel Small Diameter Tubing
|
Product Category
|
Price Range (USD/kg)
|
|---|---|
| Bulk standard welded small-diameter pipes | 7.0~11.5 |
| Standard seamless small-diameter pipes | 9.5~14.0 |
| Electropolished / non-standard thin-wall precision customized pipes | 12.0~16.0 |
To get more detailed product pricing information, click below to contact us promptly.
Industries & Applications
347 stainless tubing offers good corrosion resistance to nitric acids and is often used in applications requiring repeated heating in the range of 800 - 1650 F (427-899 C) such as:
Expansion joint tube assemblies,High-temperature gaskets / o-rings,
Aerospace engine parts,Exhaust manifolds
Other high-temperature applications,Chemical production equipment.
Export Cases
Leveraging mature customized processing capabilities and full-process quality control strengths, GNEE 347 stainless steel small-diameter tubing has been applied in multiple benchmark overseas projects.
Singapore Petrochemical Heat Exchanger Project
Supplied 4.2 tons ASTM A269 small-bore polished tubes for circulating heat exchange lines. The niobium-stabilized material resists intergranular corrosion under cyclic 400–850℃ working conditions, earning repeat orders.
Saudi Arabia Power Station Boiler Auxiliary Pipeline Project
6.7 tons ASTM A312 seamless tubes delivered for superheater auxiliary piping, with ASME certified inspection docs and fumigated wooden crate export packaging.
Poland Pharmaceutical Sterilization Equipment Project
Custom ultra-fine small tubes (Ra≤0.6μm polished finish) with SGS reports for sanitary heat exchange pipelines, supporting low-MOQ tailor-made service.
Quality Inspection
GNEE implements full-process quality control for stainless steel pipes, with strict checks covering every stage from incoming raw material inspection to finished product delivery. Key tests include raw material composition analysis, inspection of dimensional tolerances (outer diameter and wall thickness) for finished pipes, and hydrostatic testing. We also provide material certificates and third-party inspection reports to ensure full traceability throughout production.
To learn more about our quality control process, please click the link below to view our product inspection videos, testing procedures, and inspection reports.
high quality packaging
We adopt multi-layer protective export packaging. Plastic plugs are fitted at pipe ends to block dust and prevent bump damage. Each pipe is wrapped with anti-rust PE film to resist moisture and block sea fog during marine shipping. Tubes are bundled securely before crate packing, ideal for long-distance sea freight and transit transfers.
For small-diameter precision tubing, each piece is individually wrapped with soft cotton to shield finished surfaces, with sealed end caps fitted. Positioning fixtures inside wooden crates prevent shifting during handling, protecting precision machined surfaces from scratches. Moisture ingress and structural deformation are strictly controlled throughout logistics.
Interested in our quality inspection process? Click the link below to view our product testing videos and inspection reports.
FAQ
1.Is 347 stainless steel tubing better than 304 for welding?
Yes. 347 is niobium-stabilized, meaning it resists carbide precipitation during welding-making it more reliable in welded assemblies at high temperatures than 304.
2.Is 347 tubing magnetic?
No, 347 stainless steel is non-magnetic in the annealed condition, similar to 304 and 316.
3.Can 347 stainless tubing handle high pressure?
Yes, when manufactured as seamless tubing with proper wall thickness, 347 tubing supports elevated pressures in heat exchanger and high-temperature service lines.
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