Introduction
Stainless Steel 347 pipe fittings are stabilized with columbium (niobium), offering excellent resistance to intergranular corrosion even after welding and exposure to high temperatures. These fittings are ideal for use in aerospace, refinery, and chemical processing industries.
Mcneil Instruments is a trusted manufacturer, supplier, and exporter of Stainless Steel 347 pipe fittings in India, known for delivering components that meet stringent industrial and international standards.
What Sets SS 347 Apart
Stainless Steel 347 contains 17–19% Chromium, 9–13% Nickel, and is stabilized with columbium (Nb) to prevent chromium carbide precipitation.
It offers:
- Excellent weldability and mechanical strength in high-heat service.
- Resistance to intergranular corrosion in post-welded applications.
- Suitability for pressure vessels, heat exchangers, and furnace components.
Manufacturing & Quality Control
- Raw Materials: Sourced as per ASTM A403 WP347 standard.
- Forming: Fittings like elbows, tees, reducers, and stub ends are forged or formed seamlessly.
- Heat Treatment: Solution annealed to ensure resistance to sensitization.
- Finishing: Includes polishing, beveling, and threading.
- Testing & Inspection: PMI, NDT (UT/RT), tensile testing, hardness, and dimensional checks.
- Certifications: MTCs, IBR, EN 10204 compliance ensure transparency and traceability.
Technical Specifications & Mechanical Properties of Stainless Steel 347 Pipe Fittings
| Property | Details |
| Standard | ASTM A403 WP347 / ASME B16.9 / B16.11 |
| Grade | Stainless Steel 347 (UNS S34700) |
| Form | Elbows, Tees, Reducers, Caps, Stub Ends |
| Manufacturing Method | Seamless / Welded / Forged |
| Heat Treatment | Solution annealed |
| Surface Finish | Pickled, Polished, Bead-blasted |
| End Connections | Beveled, Plain, Threaded |
Mechanical Properties of Stainless Steel 347 Pipe Fittings
| Property | Value |
| Tensile Strength | ≥ 515 MPa |
| Yield Strength | ≥ 205 MPa |
| Elongation | ≥ 35% |
| Hardness | ≤ 95 HRB |
| Operating Temp | Up to 870°C |
Dimensions & Wall Thickness Chart of Stainless Steel 347 Pipe Fittings
| Nominal Size (NPS) | Wall Thickness (SCH 10S – XXS) |
| ½″ – 24″ | SCH 10S, SCH 40S, SCH 80S, XXS |
| Fittings Standard | ASME B16.9 / B16.11 |
| Dimensional Tolerance | As per ANSI B16.9 / MSS-SP-43 |
Stainless Steel 347 Pipe Fittings Certifications
| Certification | Details |
| ASTM A403 | Material and manufacturing compliance |
| ASME B16.9 / B16.11 | Fitting dimensions |
| EN 10204 3.1 / 3.2 | Mill Test Certificates |
| ISO 9001:2015 | Quality Management |
| IBR Certified | Boiler application suitability |
| NACE MR0175 (Optional) | Sour service corrosion resistance |
Stainless Steel 347 Pipe Fittings Available Sizes & Specifications
| Form | Size Range (NPS) | Schedule/Class |
| Elbows, Tees | ½″ to 24″ | SCH 10S to SCH XXS |
| Reducers, Caps | ½″ to 24″ | SCH 10S to SCH XXS |
| Unions, Stub Ends | ½″ to 4″ | Class 150 – Class 3000 |
| Custom Sizes | On Request | Based on Project Specs |
Global Reach of Mcneil Instruments: Stainless Steel 347 Pipe Fittings
- In Saudi Arabia, Mcneil Instruments is a reliable manufacturer of SS 347 pipe fittings used in petrochemical plants and high-temperature steam services.
- In Qatar, we operate as a trusted exporter, supplying SS 347 pipe fittings for high-pressure chemical processing pipelines.
- Industries in Nigeria rely on us as a dependable supplier, using our fittings in boiler systems and heat-treatment lines.
- As a committed exporter in Ghana, we support infrastructure and industrial piping needs with corrosion-resistant 347 fittings.
- In Texas, Mcneil is a renowned manufacturer and supplier, delivering 347 pipe fittings for aerospace, heat exchanger, and refineries.
- From Chicago, we act as a consistent exporter, serving HVAC, welding-intensive piping, and cleanroom applications.
- In Malaysia, Mcneil is a dedicated supplier and exporter of 347 pipe fittings for chemical tank fabrication and offshore services.
- In Singapore, we’re known as a premium manufacturer and exporter of SS 347 fittings for use in marine and energy industries.
- Across Brazil, we support industries as a long-standing supplier, offering 347 pipe fittings trusted in food processing and heat-sensitive environments.
Conclusion
Stainless Steel 347 pipe fittings are the ideal choice for demanding thermal applications requiring both weldability and resistance to sensitization. As your trusted manufacturer, supplier, and exporter, Mcneil Instruments offers world-class products, expert support, and dependable delivery.
