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Home > Stainless Steel > Stainless Steel 347 and 347H Welded Tubing
Laila Pipes and Tubes has established itself as a reliable manufacturer and supplier of top-notch Stainless Steel 347 and 347H Welded Tubing in Muscat, Oman. They specialize in precision-engineered welded tubing that adheres to international standards, making it perfect for high-temperature and corrosive environments. With state-of-the-art manufacturing facilities, rigorous quality control, and a talented technical team, Laila Pipes and Tubes caters to various industries, including chemical processing, petrochemical, oil and gas, power generation, and aerospace. Their commitment to consistent quality, timely delivery, and a customer-centric approach has helped them build a solid reputation in both regional and global markets.
Stainless Steel 347 and 347H Welded Tubing are niobium-stabilized austenitic stainless steels containing 17–20% chromium and 9–13% nickel. Grade 347 is heat-treated to prevent intergranular corrosion when being welded and exposed to high temperatures, while 347H has a higher carbon level up to 0.10% to improve creep strength and mechanical properties at high temperatures. The welded tubes provide tensile strength of 515–750 MPa and yield strength of approximately 205 MPa. They exhibit superior oxidation resistance and heat stability to 900°C with maintaining excellent weldability and formability.
Welded Tubes Size : 1 / 8″ NB – 24″ NB
Specifications : ASTM A/ASME SA213, A249, A269, A312, A358
Standard : ASTM, ASME and API
Length : Single Random, Double Random & Required Length
Outer Diameter : 6.00 mm OD up to 914.4 mm OD, Sizes up to 24” NB
Thickness : 0.3mm – 50 mm, SCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXS, SCH XS
Schedule : SCH20, SCH30, SCH40, STD, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, XXS
Types : Welded
Form : Round Tubes, Square Tubes, Rectangular Tubes, Coiled Tubes, “U” Shape, Pan Cake Coils, Hydraulic Tubes
End : Plain End, Beveled End, Treaded
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 8.0 g/cm3 | 1454 °C (2650 °F) | Psi – 75000 , MPa – 515 | Psi – 30000 , MPa – 205 | 35 % |
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
Stainless Steel 347 and 347H welded tubing are austenitic stainless steels that are stabilized with niobium (columbium) to guard against intergranular corrosion. These alloys typically contain around 17–19% chromium and 9–13% nickel, while 347H features a higher carbon content to boost creep strength at elevated temperatures. These tubing grades are known for their excellent corrosion resistance, high tensile strength, good dimensional stability during welding, and outstanding performance under prolonged thermal exposure. The welded construction guarantees uniformity, making them suitable for a wide range of industrial tubing applications.
Laila Pipes and Tubes is the largest supplier of Stainless Steel 317 and 317L Welded Tubing in Muscat, OMAN. Known for its high-quality products. We offer superior corrosion resistance, strength, and durability. Trusted by industries worldwide they provide reliable precision-engineered tubing for various applications and project needs.
| STANDARD | WERKSTOFF NR. | UNS | JIS | GOST | EN |
| SS 347 | 1.4550 | S34700 | SUS 347 | 08Ch18N12B | X6CrNiNb18-10 |
| SS 347H | 1.4961 | S34709 | SUS 347H | – | X6CrNiNb18-12 |
You’ll find Stainless Steel 347 and 347H welded tubing widely used in industries that demand high-temperature and corrosion-resistant piping solutions. They’re commonly found in heat exchangers, boiler tubes, chemical processing lines, and petrochemical plants. The power generation and oil and gas sectors rely on them for high-pressure and high-temperature tubing systems. Plus, aerospace and marine applications depend on these tubes for their long-lasting durability, thermal stability, and resistance to intergranular corrosion in harsh environments.
Stainless Steel 347 and 347H Welded Tubing finds wide application in heat exchangers, boilers, superheaters, pressure vessels, and exhaust systems where resistance to stress rupture and thermal fatigue is critical. Grade 347 is used in welded applications where precipitation of carbides should be avoided, whereas 347H is designed for systems subjected to long-term high-temperature service. These welded tubes prove to be a suitable option for corrosive and pressure applications with a reliable solution under long service periods where durability, heat resistance, and structural integrity are called for.
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