Which Pipe Is Best For High Temperature
Sep 27, 2023
Several materials are commonly used for high-temperature piping, and the suitability of each material depends on the particular requirements of the application. Here are some materials often used for high-temperature pipes:
Stainless Steel: Stainless steel, especially high-temperature grades like 310S, 321, and 347, is an excellent choice for high-temperature applications. It offers good corrosion resistance and retains its strength and integrity at elevated temperatures. Stainless steel is often used in industrial furnaces, exhaust systems, and heat exchangers.
Carbon Steel: Certain carbon steel grades can be suitable for moderate high-temperature applications (typically up to 450-600°C or 850-1112°F) with the proper heat treatment. However, carbon steel can be susceptible to oxidation and corrosion at higher temperatures.
Alloy Steel: Alloy steel pipes, like P5, P9, P11, and P22, are commonly used for high-temperature applications. They offer good strength and resistance to oxidation and are used in power plants and industrial boilers.
resistance. They are used in aerospace and chemical processing.
It's crucial to consider not only the material's ability to withstand high temperatures but also its resistance to corrosion, pressure, and the specific operating conditions of the application. Additionally, factors such as cost, availability, and ease of fabrication play a role in material selection. Consulting with materials engineers and referring to industry standards and codes is essential to make the best choice for a specific high-temperature piping application.
| Grade | UNS | C≤ | Mn | P≤ | S≤ | Si≤ | Cr | Mo |
|---|---|---|---|---|---|---|---|---|
| P1 | K11522 | 0.10~0.20 | 0.30~0.80 | 0.025 | 0.025 | 0.10~0.50 | - | 0.44~0.65 |
| P2 | K11547 | 0.10~0.20 | 0.30~0.61 | 0.025 | 0.025 | 0.10~0.30 | 0.50~0.81 | 0.44~0.65 |
| P5 | K41545 | 0.15 | 0.30~0.60 | 0.025 | 0.025 | 0.50 | 4.00~6.00 | 0.44~0.65 |
| P5b | K51545 | 0.15 | 0.30~0.60 | 0.025 | 0.025 | 1.00~2.00 | 4.00~6.00 | 0.44~0.65 |
| P5c | K41245 | 0.12 | 0.30~0.60 | 0.025 | 0.025 | 0.50 | 4.00~6.00 | 0.44~0.65 |
| P9 | S50400 | 0.15 | 0.30~0.60 | 0.025 | 0.025 | 0.50~1.00 | 8.00~10.00 | 0.44~0.65 |
| P11 | K11597 | 0.05~0.15 | 0.30~0.61 | 0.025 | 0.025 | 0.50~1.00 | 1.00~1.50 | 0.44~0.65 |
| P12 | K11562 | 0.05~0.15 | 0.30~0.60 | 0.025 | 0.025 | 0.50 | 0.80~1.25 | 0.44~0.65 |
| P15 | K11578 | 0.05~0.15 | 0.30~0.60 | 0.025 | 0.025 | 1.15~1.65 | - | 0.44~0.65 |
| P21 | K31545 | 0.05~0.15 | 0.30~0.60 | 0.025 | 0.025 | 0.50 | 2.65~3.35 | 0.80~1.60 |
| P22 | K21590 | 0.05~0.15 | 0.30~0.60 | 0.025 | 0.025 | 0.50 | 1.90~2.60 | 0.87~1.13 |
| P91 | K91560 | 0.08~0.12 | 0.30~0.60 | 0.020 | 0.010 | 0.20~0.50 | 8.00~9.50 | 0.85~1.05 |
| P92 | K92460 | 0.07~0.13 | 0.30~0.60 | 0.020 | 0.010 | 0.50 | 8.50~9.50 | 0.30~0.60 |
