What is ASTM A209 Boiler Tube?

A209 boiler tube is a seamless alloy steel tube used in high temperature and high pressure environments. It is manufactured in accordance with the relevant provisions of the A209 standard formulated by the American Society for Testing and Materials. It is mainly used in equipment such as boilers and superheaters.

ASTM A209 is a standard developed by the American Society for Testing and Materials (ASTM) to specify seamless carbon-molybdenum alloy steel pipes for high-temperature and high-pressure applications. This standard is applicable to equipment such as boilers and superheaters that require high-temperature strength and durability, especially in the power, petrochemical, oil, and gas industries.

The ASTM A209 standard mainly covers three grades: T1, T1a, and T1b

These materials contain elements such as carbon, manganese, and molybdenum, which give the steel pipe excellent mechanical properties and are suitable for use in high-temperature environments.

T1a and T1b represent different grades of material composition and mechanical properties, respectively. "a" and "b" are marks to distinguish the two different grades. Specifically, these letter marks represent slight differences in chemical composition and performance to meet different usage requirements.

According to A209, the outside diameter of steel pipe usually ranges from 12.7mm to 127mm [1/2 in. to 5 in.], and the wall thickness ranges from 0.9mm to 12.7mm [0.035 in. to 0.5 in.].

According to the ASTM A209 standard, the steel pipe is made of carbon-molybdenum alloy steel and is manufactured seamlessly.

According to regulations, the steel pipe material needs to be killed steel to ensure the uniformity of the internal structure and high-pressure resistance of the pipe.

 Manufacturing method: Hot-finished or cold-finished

 Heat treatment temperature: ≥650℃ [1200℉]

 Delivery status: fully annealed, isothermal annealed, normalized, tempered, etc.

ASTM A209 selects killed steel mainly to ensure the stability and reliability of steel pipes under high-temperature and high-pressure environments. Killed steel refers to steel that has been fully deoxygenated by adding deoxidizers (such as aluminum and silicon) during the steelmaking process. This process makes the steels performance more uniform and stable.

Function:

 Reduce pores and inclusions

 Improve the uniformity of mechanical properties

 Improve weldability

 Enhance anti-oxidation and anti-corrosion properties

 Boiler

 Superheater

 Reheater

 Heat exchanger

 Industry: oil and gas, power plants, chemical industry, etc.