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Home > Stainless Steel Tubing > Stainless Steel 348H Tubing
Laila Pipes and Tubes is a reputable manufacturer and supplier of top-notch Stainless Steel 348H Tubing based in Muscat, Oman. They provide precision-engineered tubing that adheres to international standards, specifically designed to withstand high temperatures and corrosive environments. With state-of-the-art manufacturing facilities, rigorous quality control measures, and a skilled technical team, Laila Pipes and Tubes caters to various industries, including chemical processing, petrochemical, power generation, oil and gas, and aerospace. The company has built a solid reputation in both regional and global markets, known for its consistent quality, prompt delivery, and customer-centric approach.
Stainless Steel 348H Tubing is an austenitic stainless steel grade that consists mainly of 17–20% chromium and 8–11% nickel along with added columbium (niobium) for increased stability in welding and high-temperature service. The “H” marking means a higher carbon content, enhancing creep resistance and mechanical strength at high temperatures. These tubes generally provide tensile strength of 515–750 MPa and yield strength of approximately 205 MPa. 348H tubing possesses outstanding resistance to intergranular corrosion, good weldability, and retains mechanical properties in environments up to greater than 800°C, proving suitable for constant high-heat applications.
| Sizes: | 1/8″ to 24″ |
| ASTM A312 Steel grades: | TP304/304L/304H |
| ASTM A312 Schedules: | STD, XS, XXS, SCH5S, SCH10/10S, SCH20, SCH30, SCH40/40S, SCH60, SCH80/80S, SCH100, SCH120, SCH140, SCH160 |
| Standards: | ASTM A312, ASME SA312 |
| Lengths: | SRL and DRL 5meters up to 11meters available from Stock or Production. |
| Ends: | Plain/Bevelled |
| Element | Content (%) |
|---|---|
| Iron, Fe | 66 |
| Chromium, Cr | 19 |
| Nickel, Ni | 11 |
| Manganese, Mn | 2.0 |
| Silicon, Si | 1.0 |
| Nb + Ta | 0.8 |
| Cobalt, Co | 0.2 |
| Tantalum, Ta | 0.1 |
| Carbon, C | 0.080 |
| Phosphorous, P | 0.045 |
| Sulfur, S | 0.030 |
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength | 655 MPa | 95000 psi |
| Yield strength (@ strain 0.200%) | 275 MPa | 39900 psi |
| Izod impact | 120 – 160 J | 88.5 – 118 ft-lb |
| Charpy impact | 160 J | 118 ft-lb |
| Shear modulus (typical for steel) | 77.0 GPa | 11200 ksi |
| Elastic modulus | 190-210 GPa | 27557-30458 ksi |
| Poisson’s ratio | 0.27-0.30 | 0.27-0.30 |
| Elongation at break (in 50 mm) | 45% | 45% |
| Hardness, Brinell (converted from Rockwell B hardness) | 147 | 147 |
| Hardness, Knoop (converted from Rockwell B hardness) | 164 | 164 |
| Hardness, Rockwell B | 85 | 85 |
| Hardness, Vickers (converted from Rockwell B hardness) | 169 | 169 |
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 348H tubing is an austenitic stainless steel that’s stabilized with niobium (columbium) and tantalum, offering remarkable resistance to intergranular corrosion. The “H” grade features a higher carbon content, which boosts creep strength and tensile properties at elevated temperatures. This tubing is celebrated for its excellent oxidation resistance, good weldability, high mechanical strength, and dimensional stability even when exposed to high temperatures for extended periods.
Laila Pipes and Tubes, a leading supplier of Stainless Steel 348H Tubing in Muscat, OMAN, provides a wide selection of premium pipes and tubes for diverse industrial applications. With a vast inventory and a strong focus on delivering outstanding service, they are the preferred choice for stainless steel products in the region.
You’ll find Stainless Steel 348H tubing commonly used in applications that demand strength and corrosion resistance at high temperatures. It’s often utilized in heat exchangers, boiler and superheater tubing, chemical processing equipment, and petrochemical facilities. The power generation and oil and gas sectors depend on it for high-temperature and high-pressure systems. Additionally, it’s a great fit for aerospace and industrial applications where long-lasting durability, thermal stability, and resistance to intergranular corrosion are essential.
Stainless Steel 348H Tubing finds extensive application in high-stress and high-temperature applications, such as heat exchangers, superheaters, pressure vessels, and reactor parts. It is best used for applications in power plants, chemical processing units, and refineries where long-term exposure to higher temperatures and corrosive conditions is prevalent. The tubing is also used in the aerospace and nuclear sectors due to its excellent thermal stability and carbide precipitation resistance. Because of its great weldability and resistance to thermal stress, 348H tubing is a first-choice consideration for applications requiring mechanical strength and long-term corrosion resistance.
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