ASTM A53 is a general specification for seamless and welded black and hot-dip galvanized steel pipe. It is mainly used to transport low-pressure fluids such as water, air, steam and gases. The A53 comes in three grades - A, B and C. Grade A is suitable for bending, flanging and similar forming operations, while Grade B is the most commonly used and has higher mechanical properties. A53 pipes are produced using the seamless or resistance welded (ERW) process. Welded pipe can undergo a cold working process to improve its mechanical properties. A53 pipes are required to undergo hydrostatic and non-destructive electrical tests. Hydrostatic testing is performed to ensure that the pipe can withstand a certain level of pressure.
Surface Coatings: This standard does not require specific coatings. However, pipes can be ordered with a galvanized coating (galvanized) upon request.
ASTM A106 is a specification for seamless carbon steel pipe designed specifically for high temperature applications. It is commonly used in applications such as power generation, refineries, petrochemical plants and high-pressure steam pipelines. A106 is divided into three grades: A, B and C. Grade B is the most commonly used and has good tensile and yield strength at elevated temperatures. A106 pipes are only produced using the seamless method. The seamless manufacturing process provides better wall thickness and mechanical properties compared to welded pipe. A106 pipe undergoes more rigorous testing than A53. In addition to hydrostatic and non-destructive electrical testing, the A106 also requires additional testing such as flattening, bending and tensile testing. Similar to A53, this standard does not specify specific coatings, but pipes can be ordered with various coatings depending on the application. Common coatings include black varnish, galvanized coating or other protective coatings.