Sumer Metal Industries Private Limited is a leading manufacturer, supplier, and exporter of high-quality Stainless Steel 347 and 347H Clad 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 Clad 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 | Details |
|---|---|
| Grades | SS 347 / 347H |
| Standards | ASTM A213, ASTM A312, ASTM A249, ASTM A269 |
| Form | Seamless, Welded, ERW |
| Size Range | 6mm OD to 610mm OD |
| Wall Thickness | 1mm to 30mm |
| Length | Custom lengths up to 6 meters |
| Finish | Annealed, Pickled, Polished |
| End Type | Plain, Beveled, Threaded |
| Applications | Boilers, Heat Exchangers, Furnaces, Chemical Equipment |
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 Clad and heat exchanger applications.
| Element | SS 347 | SS 347H |
|---|---|---|
| Carbon (C) | ≤ 0.08% | 0.04–0.10% |
| Manganese (Mn) | ≤ 2.0% | ≤ 2.0% |
| Silicon (Si) | ≤ 1.0% | ≤ 1.0% |
| Phosphorus (P) | ≤ 0.045% | ≤ 0.045% |
| Sulfur (S) | ≤ 0.030% | ≤ 0.030% |
| Chromium (Cr) | 17.0–20.0% | 17.0–19.0% |
| Nickel (Ni) | 9.0–13.0% | 9.0–13.0% |
| Columbium (Cb) + Tantalum (Ta) | 10xC – 1.10% | 10xC – 1.10% |
In summary, Stainless Steel 347 / 347H Clad 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 | Details |
|---|---|
| Grades | SS 347 / 347H |
| Standards | ASTM A213, ASTM A312, ASTM A249, ASTM A269 |
| Form | Seamless, Welded, ERW |
| Size Range | 6mm OD to 610mm OD |
| Wall Thickness | 1mm to 30mm |
| Length | Custom lengths up to 6 meters |
| Finish | Annealed, Pickled, Polished |
| End Type | Plain, Beveled, Threaded |
| Applications | Boilers, Heat Exchangers, Furnaces, Chemical Equipment |
These tubes are widely used in industries requiring high-temperature resistance and corrosion protection, such as power generation, chemical processing, aerospace, and automotive sectors.
SS 347H offers higher carbon content, providing improved high-temperature strength and creep resistance, making it suitable for more demanding applications.
Sumer Metal Industries adheres to international standards, conducts rigorous quality control tests, and provides mill test certificates to ensure the highest quality products.
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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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