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Home > Stainless Steel Tubing > Stainless Steel 348H Tubing
Rithav Pipes and Tubes, based in Delhi, India, stands out as a top manufacturer and supplier of high-quality Stainless Steel 348H Tubing, designed specifically for high-temperature and corrosive environments. This type of stainless steel is a stabilized austenitic alloy that includes niobium (or columbium) to boost its resistance to intergranular corrosion, particularly after welding and extended exposure to high heat. The “H” grade, with its higher carbon content compared to standard 348, offers enhanced creep strength and thermal stability. Rithav provides both seamless and welded 348H tubing, adhering to ASTM A213, ASTM A269, and various international standards, making it ideal for refineries, chemical plants, and power generation systems.
Stainless Steel 348H Tubing is mainly made up of 17–19% chromium and 9–13% nickel, along with columbium/tantalum for stabilization and a higher carbon content (around 0.04–0.10%) to perform well at elevated temperatures. Its mechanical properties boast a tensile strength of at least 515 MPa, yield strength of 205 MPa or more, and an elongation of about 35%. This alloy excels in oxidation resistance, creep strength, and weldability, performing well in environments reaching up to 1100°C (2012°F). It retains its structural integrity even under cyclic heating, making it perfect for pressure tubing and superheater 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.
By choosing Stainless Steel 348H Tubing from Rithav Pipes and Tubes, you are assured of superior quality and durability. These tubes provide outstanding corrosion resistance and strength, making them ideal for a wide range of industrial applications. Our dedication to excellent service and dependable delivery ensures customer satisfaction every time. With our expertise in stainless steel products, we deliver top-tier solutions customized to meet your specific requirements.
Rithav Pipes and Tubes, a leading supplier of Stainless Steel 348H Tubing in Delhi, India, 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.
At Rithav Pipes and Tubes, we provide custom sizes of Stainless Steel 348H Tubing to meet your exact specifications. Our dedicated team is here to offer tailored solutions for all your piping and tubing needs. For more information, feel free to reach out to us at sales@brydonpipesandtubes.co.uk.
Stainless Steel 348H Tubing finds its place in high-temperature, high-pressure systems like heat exchangers, superheaters, reheaters, pressure vessels, and boiler tubing in power generation plants. Its remarkable resistance to thermal fatigue makes it a go-to choice for both nuclear and fossil fuel power facilities, as well as in the refining and petrochemical sectors where tubes face tough conditions. The stabilized chemistry effectively prevents intergranular corrosion post-welding, making it an excellent option for furnace components, chemical process piping, and air preheaters.
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