Carbon steel seamless pipe is a seamless pipe made of carbon steel. Carbon steel refers to iron-carbon alloy steel with a carbon content of less than 2% (including 2%). Carbon steel can be further divided into low carbon steel, medium carbon steel and high carbon steel, mainly depending on the carbon content in the steel.

X-ray inspection refers to the use of X-rays to penetrate metal materials, and due to the different absorption and scattering effects of the material on the rays, the film sensitivity is different, resulting in the formation of different blackness images on the negative film. Based on this, it is a testing method to determine the internal defects of the material.

The yield strength of seamless steel pipes is one of its important mechanical properties and is crucial to ensuring the safe operation of pipelines.

Under normal circumstances, when decarburization occurs on the surface of cold-drawn seamless pipes, it is because the steel wires come into contact with the air when the lead is being melted, causing decarburization and oxidation to occur at the same time.

Directly buried prefabricated insulated seamless pipe is not a certain type of steel pipe. "Directly buried prefabricated" refers to a type of steel pipe with an insulation layer and anti-corrosion prefabricated in the insulated pipe factory.

After the installation of seamless pipes is completed and the pressure test passes, purging work is generally carried out to ensure the internal cleanliness of the pipes.