How does the manufacturing process differ between API 5L and A53 pipes?

Raw material selection
API 5L X52 pipeline: usually high-strength low-alloy steel is selected, and the purity, inclusion control and chemical composition stability of the steel are required to be high to ensure the reliability and safety of the pipeline under harsh working conditions such as high pressure and high stress.
ASTM A53 pipeline: the raw materials are mostly ordinary carbon steel or low-alloy steel, such as A53-A corresponding to domestic 10# steel, A53-B corresponding to domestic 20# steel, and A53-F corresponding to domestic Q235 material. Its chemical composition and performance are relatively conventional, and there are fewer special requirements for raw materials.
Forming process
API 5L X52 pipeline:
Seamless pipe: generally produced by hot rolling mill, furnace coil mill or medium and thick plate mill. The steel billet is first heated to the appropriate temperature, and then through perforation, rolling and other processes, the steel billet is gradually deformed into a seamless steel pipe.
Welded steel pipe: There are processes such as electric resistance welding (ERW), spiral submerged arc welding (SSAW) and straight seam submerged arc welding (LSAW). Large-diameter pipes are mostly made by spiral submerged arc welding or straight seam submerged arc welding. The steel strip or steel plate is bent and formed and then welded to form the pipe.
ASTM A53 pipe:
Hot rolling: The pipe blank is gradually deformed by heating, perforation, three-roller oblique rolling, continuous rolling and other processes to finally form a hot-rolled seamless steel pipe.
Cold drawing: On the basis of the hot-rolled pipe blank, after heading, annealing, pickling, and oiling, multiple cold drawing processes are carried out to make the steel pipe reach the required size and precision. The wall thickness of the steel pipe produced by the cold drawing process is relatively more uniform and the surface roughness is better.
Welding process
API 5L X52 pipe: For welded steel pipes, the welding process requirements are strict and non-destructive testing, such as 100% X-ray testing, is required to ensure the quality of the weld and ensure the safe operation of the pipeline under harsh environments such as high pressure and high temperature. At the same time, there are clear regulations on welding materials, welding parameters and welder qualifications.
ASTM A53 pipeline: The welding process requirements are relatively low. Different welding methods can be selected according to specific use requirements and application scenarios. Generally, it does not require comprehensive and strict non-destructive testing like API 5L pipelines. The focus of its testing is to meet conventional mechanical properties and sealing requirements.
Heat treatment process
API 5L X52 pipeline: According to different steel grades and use requirements, heat treatments such as normalizing, tempering, and quenching may be performed to improve the organizational structure and performance of steel, and improve the strength, toughness and corrosion resistance of the pipeline.
ASTM A53 pipeline: It is usually delivered in hot-rolled state or simple normalizing treatment. Some steel pipes with special requirements may undergo additional heat treatments, such as annealing, to eliminate stress and improve processing performance.