FAQs
1. What is A335 material?
ASTM A335 is a specification for seamless ferritic alloy-steel pipe intended for high-temperature service. These pipes are made from alloy steel with elements like chromium and molybdenum to enhance their strength, resistance to heat, and corrosion resistance. ASTM A335 pipes are primarily used in applications such as boilers, superheaters, and heat exchangers in power plants, oil refineries, and chemical industries, where high pressure and temperature are involved.
2. What is the difference between ASTM A333 and A335?
- ASTM A333 is a standard specification for seamless and welded carbon and alloy steel pipes for low-temperature service, typically used in environments where temperatures drop below -45.5°C.
- ASTM A335 is a specification for high-temperature service, designed to withstand temperatures up to 600°C and is often used in power generation and high-pressure applications like boilers and steam lines.
3. What are the grades of ASTM A335?
ASTM A335 includes several grades, each designed for different applications and temperature resistance. The most common grades are:
- P5: Chromium-molybdenum alloy steel for high-temperature service.
- P9: Higher chromium-molybdenum alloy steel for steam boilers and superheaters.
- P11: Contains 1% chromium and 0.5% molybdenum, commonly used for power plants and refineries.
- P22: Higher chromium and molybdenum content, used for higher pressure and temperature applications.
- P91: High-strength alloy with 9% chromium, used in ultra-high-temperature and pressure applications.
