Production Process
The production processes for seamless steel pipe (stock pipe) and expanded pipe differ significantly. The original pipe refers to the primary steel pipe of seamless steel pipe produced by using various steel billets as raw materials and undergoing processing and heat treatment. The production of raw pipes requires multiple processing steps, including billet pretreatment, piercing, hot rolling or cold drawing and other thermal processing processes. The production process of raw steel pipes is relatively complicated and difficult to process, but the seamless steel pipes produced have high quality and strength and are an important material widely used in various mechanical and structural equipment. Seamless steel pipes are widely used in the manufacturing of machinery and structural equipment, primarily in the manufacture of high-pressure boilers, oil and gas transmission pipelines, automotive engines, and mechanical parts.

Pipe expansion is the process of increasing the size of existing seamless steel pipes. Its production process is relatively simple, and there are two main methods: one is rolling or stretching; the other is extrusion. The production process of pipe expansion requires the use of special processing equipment and molds. During the pipe expansion process, the steel pipe will be subjected to greater pressure and force. Although the processing difficulty is not as good as the original pipe, the processing accuracy requirements are higher, because the product after pipe expansion needs to ensure surface finish and dimensional accuracy to ensure its application effect. Expanded pipe is primarily used in applications such as steel pipe joints, signal brackets, and pressure vessels.

Processing Methods
The processing methods for seamless steel pipe stock and expanded pipe also differ significantly. The production of seamless steel pipe raw pipes requires a series of thermal processing processes. If any quality problems occur during the production process, the quality of the final product will also be affected.

Pipe expansion is a process performed on existing seamless steel pipes, which greatly reduces the process difficulty and processing costs. After expansion, the steel pipe undergoes heat treatment and other processing processes to increase its strength and ensure its corrosion resistance.

The two types of steel pipe products have different application fields, and due to the difference in use, the required performance parameters are also different.

Answers

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