Smoothing-Austenitic, SA tubes for short, are the tubes for general production purpose. A decent example of this strength is represented in the polycrystalline tubes which have no rusting, not at all subject to high shearing stress, and maintain high temperatures as well as pressures. In this article, we'll be looking at four types of SA tubes: tubes’ advantages and features will be detailed in this post to make the right decision when selecting the proper heat exchanger for your boiler system.
1. SA213 T11
The SA213 T11 grade is highly priced by boiler tube manufacturers in India. This ferritic alloy welded tube is designed for use in a high-temperature operation state, which is commonly found in boilers and heat exchangers. As its creep strength is high and it can work continuously at temperature up to 1200°F (649°C) which is the highest permissible temperature for alloy steel. So, SA213 T11 is very suitable for operating superheaters and reheating devices.
Being the fact that chromium and molybdenum are added to this alloy, it is made more resistant to oxidation, making it capable of working in either steam or no steam environments.
2. SA213 T22
Apart from that, a very popular one is the SA213 T22 boiler tube. The nickel-base superalloy is not far away from SA213 T11 in performance, but it additionally has higher creep strength and thermal oxidation resistance. Since then, SA213 T22 has received more chromium and molybdenum and is able to endure temperatures up to 1100 degrees Fahrenheit (593 degrees Celsius). It is also ideal for short-term service up to 1200°F (649°C).