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Home > Stainless Steel > Stainless Steel 347/347H Seamless Tubing
Laila Pipes and Tubes is a reputable manufacturer and supplier of top-notch Stainless Steel 347/347H Seamless Tubing based in Muscat, Oman. They specialize in precision-engineered seamless tubing that adheres to international standards, making it perfect for tough high-temperature and corrosive environments. With state-of-the-art manufacturing facilities, rigorous quality control measures, and a talented technical team, Laila Pipes and Tubes caters to various industries, including chemical processing, power generation, oil and gas, aerospace, and marine. Known for their unwavering quality, prompt delivery, and customer-centric solutions, the company has built a solid reputation in both local and global markets.
Stainless Steel 347/347H Seamless Tubing is a niobium-stabilized austenitic stainless steel alloy with a chromium content of 17–20% and nickel content of 9–13%. Grade 347 offers resistance to intergranular corrosion when in and after welding, whereas 347H has increased carbon content up to 0.10% for better creep strength and longevity in elevated temperature service. These seamless tubes have a tensile strength of 515–750 MPa and a yield strength of approximately 205 MPa. The seamless structure increases pressure resistance, provides a smooth internal finish, and ensures consistent performance up to a temperature of 900°C.
Tube Range : 6.35 mm OD To 101.6 mm OD Guage: 25 SWG – 10 SWG
Outer Diameter : 3.00 mm – 219.10 mm
Wall Thickness : 0.40 mm – 12.70 mm
Schedules : 5, 10S, 10, 30, 40S, 40, 80, 80S, XS, 160, XXH
Length : Upto 30 meters, Custom Cut Lengths
Specifications : ASTM A213 / ASTM SA213
Types : Round, Square, Rectangle, Coil, “U” Shape, Hydraulic & Honed Tubes
| SS | 347 | 347H |
| Ni | 09 – 13 | 09 – 13 |
| N | – | – |
| Cr | 17 – 20 | 17 – 19 |
| C | 0.08 max | 0.04 – 0.08 |
| Si | 1 max | 1 max |
| Mn | 2 max | 2 max |
| P | 0.045 max | 0.045 max |
| S | 0.030 max | 0.03 max |
| OTHER | Nb=10(C+N) – 1.0 | 8xC min – 1.00 max |
| Grade | 347 / 347H |
| Tensile Strength (MPa) min | 515 |
| Yield Strength 0.2% Proof (MPa) min | 205 |
| Elongation (% in 50mm) min | 40 |
| Hardness | |
| Rockwell B (HR B) max | 92 |
| Brinell (HB) max | 201 |
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 347/347H seamless tubing is an austenitic stainless steel that’s stabilized with niobium (columbium) to guard against intergranular corrosion. The 347 grade features around 17–19% chromium and 9–13% nickel, while the 347H variant has a higher carbon content, enhancing its creep strength at elevated temperatures. Both grades boast excellent corrosion resistance, high tensile strength, good creep resistance, and remarkable stability during welding and extended high-temperature use. These characteristics make them perfect for aggressive chemical and thermal environments.
Laila Pipes and Tubes, one of the largest suppliers of Stainless Steel 347/347H Seamless Tubing in Dubai, OMAN, offers a comprehensive range of high-quality pipes and tubes suitable for various industrial applications. Their extensive inventory and commitment to exceptional service make them a go-to choice for stainless steel products in the region.
You’ll find Stainless Steel 347/347H seamless tubing widely used in applications that demand long-lasting durability and high corrosion resistance at elevated temperatures. They’re often found in heat exchangers, boilers, superheaters, chemical processing equipment, and petrochemical plants. The power generation and oil and gas sectors depend on them for high-pressure and high-temperature systems. Plus, aerospace and marine applications utilize these seamless tubes where reliability, oxidation resistance, and dimensional stability under thermal stress are essential.
| Grade | UNS No | Old British | Euronorm | Swedish SS | Japanese JIS | ||
| BS | En | No | Name | ||||
| 347 | S34700 | 347s31 | 58G | 1.4550 | X6CrNiNb18-10 | 2338 | SUS 347 |
Stainless Steel 347/347H Seamless Tubing finds widespread applications in superheaters, heat exchangers, boiler tubes, reactor systems, and high-temperature chemical processing lines. The grade 347 is particularly suitable for welded systems where sensitization resistance is paramount, while 347H is used for continuous exposure at elevated temperatures with greater mechanical stresses. The tubes offer a reliable solution where thermal stability, corrosion resistance, and integrity are imperative for safe and efficient long-term operations.
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