Stainless Steel 347 / 347h U Tubes, 347/347h Stainless Steel U Tube Manufacturer, SS 347/347h U Tube Supplier, SS 347/347h U Tube Exporter, Stainless Steel 347/347h Precision Tubing, SS 347/347h Small Diameter Tube ,SS 347/347h U Tubes
Stainless Steel 347 / 347H U-Tubes from Sumer Metal Industries Private Limited are engineered for long service life in high-temperature and corrosive environments. These U-shaped tubes are produced from stabilized austenitic stainless steel containing niobium (columbium), which prevents chromium carbide formation and provides excellent resistance to intergranular corrosion after exposure to temperatures in the sensitization range. Sumer Metal Industries manufactures these U-tubes with consistent surface finish and straightness suitable for heat exchangers, boilers, petrochemical exchangers and furnace coils.
As a manufacturer, supplier and exporter, Sumer Metal Industries emphasizes metallurgical control and traceability: material test certificates (MTC) are issued per buyer requirements and heat-treatment is controlled to meet 347 / 347H properties. The company supplies full commercial lengths and precision-bent U-tubes, with options for pickling, bright annealing, and NDT (eddy current or hydrostatic) per project needs. Quality processes ensure consistent dimensional tolerances and roundness required by shell-and-tube heat exchanger fabricators.
Sumer Metal Industries exports 347 / 347H U-Tubes to Oman, Qatar, Saudi Arabia, the UAE, Kuwait, Spain, Germany, the USA, Canada and several regions across Africa — offering logistics, export documentation, and packaging suitable for international shipment. Typical customers include EPC contractors, heat-exchanger manufacturers, oil & gas companies, power plants, and chemical processors. The export pack options include wooden boxes, seaworthy crates, or bundled bundles with desiccant and rust inhibitor depending on destination and transit time.
The 347 grade is the standard niobium-stabilized austenitic grade; 347H is the high-carbon variant (higher minimum carbon content) intended for prolonged elevated-temperature service where creep resistance and higher tensile strength at temperature are required. Sumer Metal Industries can supply both grades, advising customers on grade selection based on maximum operating temperature, corrosion environment, and fabrication/ welding requirements.
Specification of Stainless Steel 347 / 347h U Tubes
| Specification | Details |
|---|---|
| Product | Stainless Steel 347 / 347H U Tubes |
| Standards | ASTM A213, ASTM A249, ASTM A269, ASTM A789 |
| Grade | SS 347 (UNS S34700), SS 347H (UNS S34709) |
| Equivalent Standards | AISI 347 / 347H, EN X6CrNiNb18-10 |
| Type | U Tubes / Heat Exchanger Tubes |
| Size Range | 6.35 mm OD to 25.4 mm OD (Custom sizes available) |
| Wall Thickness | 0.5 mm to 3.0 mm |
| Form | Straight Tubes, U-Bent Tubes |
| Finish | Annealed / Pickled / Polished |
| Application | Heat Exchangers, Boilers, Power Plants, Petrochemical Industry |
| Export Destinations | Oman, Qatar, Saudi Arabia, UAE, Kuwait, Spain, Germany, USA, Canada, Africa |
Chemical Composition of Stainless Steel 347 / 347h U Tubes
| Element | SS 347 (%) | SS 347H (%) |
|---|---|---|
| Carbon (C) | ≤ 0.08 | 0.04 – 0.10 |
| Chromium (Cr) | 17.0 – 19.0 | 17.0 – 19.0 |
| Nickel (Ni) | 9.0 – 13.0 | 9.0 – 13.0 |
| Manganese (Mn) | ≤ 2.0 | ≤ 2.0 |
| Silicon (Si) | ≤ 1.0 | ≤ 1.0 |
| Niobium (Nb + Ta) | 0.10 – 1.0 | 0.10 – 1.0 |
| Phosphorus (P) | ≤ 0.045 | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 | ≤ 0.030 |
| Nitrogen (N) | ≤ 0.10 | ≤ 0.10 |
| Iron (Fe) | Balance | Balance |
For fabrication and welding, 347/347H U-tubes show good weldability using conventional austenitic filler metals; however, standard good practices (pre/post weld procedures) should be followed for critical applications. Surface finish options include mill finish, 2B, or custom mechanical / electrolytic polishing. Sumer Metal Industries provides cut-to-length and custom U-bend radii to match OEM tube-bundle designs and offers material certificates and test reports with each shipment.
Specification of Stainless Steel 347 / 347h U Tubes
| Specification | Details |
|---|---|
| Product | Stainless Steel 347 / 347H U Tubes |
| Standards | ASTM A213, ASTM A249, ASTM A269, ASTM A789 |
| Grade | SS 347 (UNS S34700), SS 347H (UNS S34709) |
| Equivalent Standards | AISI 347 / 347H, EN X6CrNiNb18-10 |
| Type | U Tubes / Heat Exchanger Tubes |
| Size Range | 6.35 mm OD to 25.4 mm OD (Custom sizes available) |
| Wall Thickness | 0.5 mm to 3.0 mm |
| Form | Straight Tubes, U-Bent Tubes |
| Finish | Annealed / Pickled / Polished |
| Application | Heat Exchangers, Boilers, Power Plants, Petrochemical Industry |
| Export Destinations | Oman, Qatar, Saudi Arabia, UAE, Kuwait, Spain, Germany, USA, Canada, Africa |
🏭 Industry & Application
- ✅ SS 347/347h U Tubes for Medical Industry
- ✅ SS 347/347h U Tubes for Chemical Processing
- ✅ SS 347/347h Tubes for U Lines
- ✅ Stainless Steel 347 / 347h U Tubes for Gas & Liquid Flow
- ✅ SS 347/347h Tubes for Heat Exchangers
❓ Frequently Asked Questions (FAQs)
Q1: What are Stainless Steel 347 / 347H U-Tubes used for?
347 and 347H U-Tubes are used in high-temperature heat exchangers, boilers and petrochemical equipment where resistance to intergranular corrosion and good high-temperature strength are required.
Q2:How do I choose between 347 and 347H U-tubes?
Choose 347H for prolonged service at elevated temperatures (better creep strength due to higher carbon). Choose standard 347 for most heat-exchanger duties where long-term high-temperature creep resistance is not required.
Q3:Does Sumer Metal Industries export 347 / 347H U-Tubes and provide certificates?
Yes — Sumer Metal Industries exports to Oman, Qatar, Saudi Arabia, UAE, Kuwait, Spain, Germany, USA, Canada and several African regions and supplies material test certificates (MTC), packaging and export documentation per buyer requirements.
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At Sumer Metal Industries Pvt. Ltd., we follow a zero-defect policy by implementing stringent quality checks, using certified raw materials, and continuously improving our processes to deliver reliable and consistent tubing solutions
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