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Home > Stainless Steel Tubing > Stainless Steel 348H Tubing
Blundell Pipes and Tubes, located in Hamilton, New Zealand, stands out as a top manufacturer and supplier of high-quality Stainless Steel 348H Tubing. Known for its precision engineering and reliability, this company produces heat-resistant, high-performance tubing that’s perfect for tough industrial applications. By utilizing cutting-edge manufacturing technologies and maintaining strict quality control, Blundell Pipes and Tubes guarantees that every product meets both national and international standards. Their Stainless Steel 348H Tubing is celebrated for its excellent corrosion resistance, long-term stability at high temperatures, and impressive mechanical strength. They cater to various industries, including petrochemical, power generation, aerospace, and chemical processing, all while being dedicated to providing durable and trustworthy tubing solutions.
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.
The composition of Stainless Steel 348H Tubing includes iron, chromium, nickel, and niobium, with a carefully managed carbon content to boost its performance at high temperatures. The addition of niobium helps stabilize the steel, preventing carbide precipitation and ensuring it can resist creep over time. In terms of mechanics, 348H tubing showcases remarkable tensile strength, superior yield strength, and outstanding toughness even at elevated temperatures. It also boasts excellent oxidation resistance, thermal stability, and weldability, making it a go-to choice for applications that require reliable performance under prolonged high-temperature and high-pressure conditions.
Blundell Pipes and Tubes, a leading supplier of Stainless Steel 348H Tubing in Hamilton, New Zealand, 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 widely used in industries that need heat-resistant and durable piping solutions. It’s often found in boilers, heat exchangers, and high-temperature chemical processing equipment. The petrochemical and power generation sectors depend on 348H tubing for steam lines, furnace components, and superheaters. It’s also utilized in aerospace and marine engineering for structural applications and high-temperature fluid transport. Plus, it’s well-suited for thermal oxidizing environments and systems that require long-term creep resistance. Its unique combination of corrosion resistance and durability makes it an excellent choice for demanding applications.
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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