Difference between ASTM A106 GR. C & ASTM A106 GR. B Pipes

ASTM A106 is a specification for seamless carbon steel pipes for high-temperature service. It covers various grades of steel pipes, including Grade B and Grade C. Here are the main differences between ASTM A106 GR. C and ASTM A106 GR. B pipes:

1. Chemical Composition: The chemical composition requirements for both grades are different. ASTM A106 GR. B pipes require a minimum carbon content of 0.30% whereas ASTM A106 GR. C pipes require a minimum carbon content of 0.35%. Additionally, the maximum manganese and phosphorus content may vary between the two grades.
2. Mechanical Properties: The mechanical properties, such as tensile strength, yield strength, and elongation, may also differ between ASTM A106 GR. C and ASTM A106 GR. B pipes. The exact values are specified in the respective standards and may vary depending on the pipe size.
3. Usage/Application: ASTM A106 GR. B Seamless Pipes are commonly used for transporting fluids and gases at high temperatures and pressures. They are suitable for applications such as refineries, power plants, and process piping systems. ASTM A106 GR. C Seamless Pipes, on the other hand, are typically used for higher temperature service compared to GR. B pipes. They may be used in similar applications but are better suited for more extreme temperature conditions.
4. Availability: ASTM A106 GR. B pipes are more commonly available and widely used in various industries. ASTM A106 GR. C pipes are less common and may be less readily available in the market.

It is important to note that the specific requirements and properties of the pipes should always be verified by referring to the latest edition of the ASTM A106 standard or consulting with the pipe manufacturer or supplier.