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Home > Stainless Steel > Stainless Steel 347 and 347H Seamless Pipes
Laila Pipes and Tubes is a well-respected manufacturer and supplier of top-notch Stainless Steel 347 and 347H Seamless Pipes based in Muscat, Oman. They specialize in precision-engineered pipes that adhere to international standards, making them perfect for tough industrial applications. With cutting-edge manufacturing facilities, rigorous quality control measures, and a skilled technical team, Laila Pipes and Tubes caters to various sectors, including oil and gas, chemical processing, power generation, and aerospace. Known for their unwavering quality, prompt delivery, and customer-centric approach, the company has built a solid reputation in both local and global markets.
The Stainless Steel 347 and 347H Seamless Pipes are made from a titanium-stabilized austenitic stainless steel blend that includes chromium, nickel, and titanium. The 347H variant features a higher carbon content, which enhances its high-temperature strength and creep resistance. Both grades excel in resisting intergranular corrosion, oxidation, and pitting in harsh environments. On the mechanical side, these pipes offer high tensile and yield strength, toughness, and excellent fatigue resistance, all while ensuring good weldability and machinability. Their seamless design guarantees dimensional stability, uniform wall thickness, and reliable performance in high-pressure and high-temperature settings.
Range : 6NB to 1200NB
Outer Diameter : 1/8″ NPS to 12″ NPS
Thickness : 0.6 mm to 12.7 mm
Schedules : SCH. 5, 10, 20, 30, 40, 60, 80, 100, 120, 140, 160, XXS.
Length : Single Random, Double Random & Cut Length
Specifications : ASTM A312 / ASTM SA312
Types : Round, Square, Rectangle, Hydraulic, Honed Tubes
End : Plain End, Beveled End
| STANDARD | UNS | WERKSTOFF NR. |
| SS 347 | S34700 | 1.4550 |
| SS 347H | S34709 | 1.4961 |
| Ni | 09 – 13 | 09 – 13 |
| N | – | – |
| Cr | 17 – 20 | 17 – 19 |
| C | 0.08 max | 0.04 – 0.08 |
| Si | 1 max | 0.75 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 and 347H seamless pipes are austenitic stainless steels that are stabilized with niobium (columbium) to boost their resistance to intergranular corrosion. The 347 grade contains about 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 are celebrated for their excellent corrosion resistance, high tensile strength, and remarkable stability during welding and high-temperature applications. These features make them ideal for extended use in harsh chemical and high-temperature settings.
Laila Pipes and Tubes, one of the largest suppliers of Stainless Steel 347 and 347H Seamless Pipes in Muscat, 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.
| 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 |
These seamless pipes are extensively utilized in high-temperature and corrosive environments. They’re commonly found in boilers, heat exchangers, superheaters, and chemical processing equipment. The power generation and petrochemical sectors depend on them for their durability under thermal stress. Moreover, industries like oil and gas, aerospace, and marine applications rely on these pipes for their ability to withstand high pressure, high temperatures, and corrosive conditions, where reliability, longevity, and corrosion resistance are absolutely essential.
These Stainless Steel 347 and 347H Seamless Pipes find extensive use in boilers, heat exchangers, pressure vessels, and piping systems that operate at elevated temperatures. They are also essential in petrochemical and chemical plants, power generation facilities, and oil & gas operations where high-temperature corrosion resistance is crucial. Additionally, they are perfect for furnace components, industrial ovens, and high-temperature process piping that demand long-lasting strength and durability. Their blend of mechanical strength and high-temperature resistance makes them a go-to choice for many industrial applications.
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