Stainless Steel 347 / 347h Boiler Tubes, 347/347h Stainless Steel Boiler Tube Manufacturer, SS 347/347h Boiler Tube Supplier, SS 347/347h Boiler Tube Exporter, Stainless Steel 347/347h Precision Tubing, SS 347/347h Small Diameter Tube ,SS 347/347h Boiler Tubes
Sumer Metal Industries Private Limited is a leading manufacturer, supplier, and exporter of high-quality Stainless Steel 347 and 347H Boiler Tubes. The company has established a strong presence in international markets, exporting to countries including Oman, Qatar, Saudi Arabia, the UAE, Kuwait, Spain, Germany, the USA, Canada, and several regions across Africa. Their products are recognized for reliability, durability, and compliance with global standards.
The SS 347 and 347H boiler tubes are widely used in high-temperature applications due to their excellent resistance to intergranular corrosion. These tubes contain niobium (columbium), which stabilizes the stainless steel and prevents carbide precipitation, ensuring long-lasting performance in critical industries such as power generation, chemical processing, and petrochemical sectors.
Sumer Metal Industries manufactures these tubes in a variety of sizes and forms, including seamless, welded, ERW, and fabricated tubes. Customers can choose from multiple diameters, wall thicknesses, and lengths, with finishes ranging from bright annealed to polished and mirror finishes. The company also provides tubes with plain ends, beveled ends, or threaded ends to meet specific industrial requirements.
The chemical composition of SS 347 and 347H tubes is carefully controlled. SS 347 contains a maximum carbon of 0.08%, while SS 347H has a higher carbon content between 0.04–0.10% for improved high-temperature strength. Both grades include chromium (17–20%), nickel (9–13%), manganese, silicon, and niobium as major alloying elements, with iron as the balance, ensuring superior corrosion resistance and mechanical stability.
Specification of Stainless Steel 347 / 347h Boiler Tubes
| Specification | SS 347 | SS 347H |
|---|---|---|
| Grades Available | SS 347 (UNS S34700) | SS 347H (UNS S34709) |
| Standards | ASTM A213, A249, A269; ASME SA213, SA249, SA269 | |
| Outside Diameter (OD) | 6.00 mm to 914.4 mm | |
| Wall Thickness | 0.3 mm to 50 mm | |
| Length | Single Random, Double Random, and Custom Lengths | |
| Forms | Seamless, Welded, ERW, Fabricated, CDW | |
| Finishes | 2B, No.4, No.1, No.8 Mirror Finish | |
| End Types | Plain End, Beveled End, Threaded | |
| Delivery Conditions | Annealed and Pickled, Polished, Bright Annealed, Cold Drawn | |
These tubes exhibit impressive mechanical properties, including a tensile strength of 515 MPa, yield strength of 205 MPa, and elongation of up to 35%. The hardness of these tubes typically measures 92 on the Rockwell B scale. SS 347H, with its slightly higher carbon content, offers improved creep resistance at elevated temperatures, making it suitable for demanding boiler and heat exchanger applications.
Chemical Composition of Stainless Steel 347 / 347h Boiler Tubes
| Element | SS 347 (UNS S34700) | SS 347H (UNS S34709) |
|---|---|---|
| Carbon (C) | ≤ 0.08% | 0.04% – 0.10% |
| Manganese (Mn) | ≤ 2.00% | ≤ 2.00% |
| Silicon (Si) | ≤ 1.00% | ≤ 1.00% |
| Phosphorus (P) | ≤ 0.045% | ≤ 0.045% |
| Sulfur (S) | ≤ 0.030% | ≤ 0.030% |
| Chromium (Cr) | 17.00% – 20.00% | 17.00% – 19.00% |
| Columbium (Cb/Nb) | (10 × C) – 1.10% | (8 × C) – 1.10% |
| Nickel (Ni) | 9.00% – 13.00% | 9.00% – 13.00% |
| Iron (Fe) | Balance | Balance |
In summary, Stainless Steel 347 / 347H Boiler Tubes offer a reliable, corrosion-resistant, and hygienic solution for demanding industrial applications. Whether used in sterile environments, high-temperature processing, or corrosive chemical handling, these tubes deliver long-term performance, reduced maintenance, and full compliance with industry hygiene standards.
Specification of Stainless Steel 347 / 347h Boiler Tubes
| Specification | SS 347 | SS 347H |
|---|---|---|
| Grades Available | SS 347 (UNS S34700) | SS 347H (UNS S34709) |
| Standards | ASTM A213, A249, A269; ASME SA213, SA249, SA269 | |
| Outside Diameter (OD) | 6.00 mm to 914.4 mm | |
| Wall Thickness | 0.3 mm to 50 mm | |
| Length | Single Random, Double Random, and Custom Lengths | |
| Forms | Seamless, Welded, ERW, Fabricated, CDW | |
| Finishes | 2B, No.4, No.1, No.8 Mirror Finish | |
| End Types | Plain End, Beveled End, Threaded | |
| Delivery Conditions | Annealed and Pickled, Polished, Bright Annealed, Cold Drawn | |
🏭 Industry & Application
- ✅ SS 347/347h Boiler Tubes for Medical Industry
- ✅ SS 347/347h Boiler Tubes for Chemical Processing
- ✅ SS 347/347h Tubes for Boiler Lines
- ✅ Stainless Steel 347 / 347h Boiler Tubes for Gas & Liquid Flow
- ✅ SS 347/347h Tubes for Heat Exchangers
❓ Frequently Asked Questions (FAQs)
1. What industries utilize Stainless Steel 347/347H boiler tubes?
These tubes are extensively used in power generation, petrochemical, chemical processing, and heat exchanger industries due to their excellent high-temperature strength and resistance to intergranular corrosion.
2. What is the advantage of using SS 347H over SS 347?
SS 347H has a higher carbon content, providing improved high-temperature strength and creep resistance, making it suitable for more demanding applications.
3. How does Sumer Metal Industries ensure product quality?
The company adheres to stringent quality control measures, including thorough testing and inspection of products before delivery, ensuring compliance with international standards.
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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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