SS 348H tubing, also known as UNS S34809 or AISI 348H, is an austenitic stainless steel alloy specifically designed for high-temperature applications. Compared to standard 300-series steels, it boasts improved creep strength and stability when exposed to elevated temperatures, making it ideal for use in boiler tubes, super-heaters, reheaters, and heat exchangers. This tubing can be produced either seamless or welded, adhering to established standards for high-temperature tubing.
On the chemical side, SS 348H contains about 17.0-19.0% chromium (Cr), 9.0-12.0% nickel (Ni), and a controlled carbon content of around 0.04-0.10%. It also includes stabilizing elements like niobium and titanium, which help manage grain growth at high temperatures. In its annealed state, this alloy demonstrates impressive mechanical properties: for instance, it has a tensile strength of at least 515 MPa (approximately 75 ksi), a yield strength of at least 205 MPa, and an elongation of at least 40%. The modulus of elasticity is roughly 200 GPa. Even at elevated temperatures, SS 348H maintains good strength; for example, at around 540 °C, the tensile strength may decrease to about 380 MPa. Its density ranges from 7.8 to 8.0 g/cm³. Thanks to its alloying and stabilizing elements, SS 348H shows excellent creep resistance and structural stability in high-temperature environments.
| 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 |
| AISI 348H Chemical Properties | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| C | Mn | P | S | Si | Cr | Ni | Cb | Co | Ta |
| 0.08 Max | 2.00 Max | 0.045 Max | 0.030 Max | 1.00 Max | 17.0-20.0 | 9.0-13.0 | 1.10 Max | 0.20 Max | 0.10 Max |
| Yeild strength | Tensile strength | Elongation | Reduction |
| Min 0.2% Mpa | Min Mpa | Min % | Min % |
| 205 | 515 | 30 | 50 |
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We maintains the maximum quality levels by conducting a serious testing and testing certification process to ensure Stainless Steel 348H Tubing quality. Each of the products, before they reach the customers’ doorstep, will undergo proper tests including dimensional verification, chemical analysis, and some mechanical testing procedures. The respective company issues an MTR ensuring the material conformity to international norms and specifications.
This tubing is seamless, available in various sizes with precise dimensions. It offers excellent corrosion resistance suitable for high-temperature applications.
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SS 348H tubing is particularly well-suited for high-temperature settings where stability, creep resistance, and corrosion resistance are crucial. Common applications include boiler and superheater tubes, reheater tubes in power plants, steam-generator tubing, and heat exchanger tubing.
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