ASTM A335 pipe, also known as Chrome-Moly Alloy Pipe, is widely used in various industries for high temperature and high pressure services. It is available in different grades such as P5, P9, P11, P22, and P91. Market data shows that it is one of the most commonly used alloy pipes in industries such as boiler manufacturing, heat exchangers, power stations, and high and super high pressure vessels.
What is ASTM A335 pipe?
ASTM A335 pipe, also known as ASME S/A335 Chrome-Moly pipe, is a type of seamless pipe that is specifically designed for high-temperature environments. It can withstand temperatures ranging from 540 to 750 °C.
A335 pipes are commonly referred to as chrome moly pipes due to their high content of Chromium and Molybdenum. The presence of Molybdenum enhances the strength, resistance, elasticity, hardenability, and overall quality of the pipe. It also improves the high temperature resistance and corrosion resistance of the steel. Molybdenum plays a crucial role in preventing softening, limiting grain growth, and reducing the risk of embrittlement.
ASTM A335 P91 pipes – High Pressure Boiler Pipes
It is important to note that ASTM A335 Grade P91 pipe is a high-grade pipe that is commonly used for high-pressure boilers. P91 pipe is particularly suitable for bending, flanging, and similar operations, including welding. The steel material must adhere to specific chemical composition, tensile properties, and hardness requirements.
There are two variants available: ASTM A335 P91 alloy steel pipe and high-pressure boiler pipes. The range of these pipes is dependent on their size, which is determined by their specific usage. The length of the pipe will be subject to a hydrostatic test, and there will also be a non-destructive examination performed in accordance with the specifications.
As a result, chrome moly pipe is widely used in the power generation and petrochemical industries due to its corrosion resistance, high tensile strength, and ability to withstand high temperatures. This makes it a cost-effective choice for these industries.
