ASTM A192 Seamless Carbon Steel Boiler Tubes

ASTM A192 is a specification that covers minimum-wall-thickness, seamless carbon steel boiler and superheater tubes for high-pressure service. The tubes are commonly used in the construction of power boilers, steam boilers, and high-temperature piping systems. The ASTM A192 tube is manufactured by a hot-working process and is made from carbon-manganese steel, which is designed for heat transfer applications. The tube is available in different sizes and dimensions, and it has excellent tensile strength and high hardness, making it suitable for use in high-pressure and high-temperature environments. Overall, the ASTM A192 tube is a high-quality, reliable tube that is widely used in industrial applications that require high-pressure and high-temperature resistance.

ASTM A192/ ASME SA-192 seamless carbon steel boiler tubes made for high-pressure service, 76.2mm(O.D.) x 3.0mm(W.T.) x 6700mm(L), supplied to Dammam, Saudi Arabia.

Manufacture & Heat Treatment

The ASTM A192 tube is manufactured using the hot-working process. The process involves heating the steel billet to a high temperature and then piercing it with a mandrel to form a hollow tube. The tube is then rolled to the desired size and thickness and heat treated to achieve the desired mechanical properties.

The hot piercing mill for the manufacture of ASTM A192 seamless boiler tubes. Final delivery conditions: full annealing + stress relieving.

The ASTM A192 tube is heat treated after the manufacturing process to improve its mechanical properties. The heat treatment process involves annealing the tube by heating it to a temperature of 870°C [1600°F] and holding it at that temperature for a specific period of time. The annealing process helps to remove any stresses in the tube caused by the manufacturing process and also improves its ductility and toughness. After annealing, the tube is allowed to cool slowly in a controlled environment to avoid any distortion or cracking. The ASTM A192 tube may also be subjected to other heat treatments, such as normalizing or quenching and tempering, depending on the desired mechanical properties. Overall, the heat treatment process for ASTM A192 tube is crucial for achieving the desired mechanical properties and ensuring the tube’s reliability and longevity in high-pressure and high-temperature environments.

Chemical Composition Requirements

ASTM A192 specification requires that the steel used in the tube must be vacuum degassed and continuously cast to ensure high-quality and consistent material. The steel must also have a fine grain structure and be fully killed, meaning that all carbon is combined with an element such as manganese to prevent the formation of brittle iron carbides. The chemical composition of ASTM A192 tube is critical to its performance in high-pressure and high-temperature environments. The low carbon content helps to prevent the tube from becoming brittle, while the manganese provides strength and toughness. The other elements, such as phosphorus and sulfur, are kept to a minimum to avoid any negative effects on the tube’s properties.

Mechanical Properties

ASTM A192 tube is a high-quality, reliable tube that is designed to withstand high-pressure and high-temperature environments. Its mechanical properties, such as high tensile strength and yield strength, combined with its low carbon content and fine grain structure, make it an excellent choice for use in power boilers, steam boilers, and other high-temperature applications.

Dimensional Tolerances

The permissible variation in the wall thickness of the tube is [0, +10%] of the specified wall thickness. The length of ASTM A192 boiler tubes must be within the specified range, with a tolerance of [-0 mm, +6.4 mm]. The tubes must be reasonably straight, with a maximum deviation of 3 mm per any 1.5 m length.

Tests & Inspection

ASTM A192 tubes are subjected to various tests and inspections to ensure their quality and suitability for high-pressure and high-temperature applications. Some of the common tests performed on ASTM A192 tubes are: hydrostatic testing, eddy current testing, flattening testing, flaring testing, hardness testing, and non-destructive testing. All of these tests are designed to ensure that ASTM A192 tubes meet the stringent requirements of the specification and are suitable for use in high-pressure and high-temperature applications.