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1. The manufacturing process is different: hot rolled steel pipe: hot rolled steel pipe is made by heating the billet to the appropriate rolling temperature at high temperature and then rolling it. Firstly, the billet is heated to a higher temperature by a heating furnace, and then it is continuously rolled by a rolling mill to finally form a steel pipe with the required size and wall thickness. Cold-drawn steel pipe: Cold-drawn steel pipe is to reprocess the heat-treated steel pipe at room temperature, and change the size and wall thickness of the steel pipe through drawing and cold working. Firstly, the suitable heat-treated steel pipe is selected as raw material, and then it is put into the cold drawing machine. Through the cold drawing process, the diameter gradually decreases and the length gradually increases, and the required size and wall thickness are obtained.
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2. Differences in physical properties: Hot rolled steel pipes have the following characteristics:
3. The crystal structure is coarse and the grain size is relatively large.
4. High internal stress, prone to plastic deformation and fracture.
5. The surface is rough and not as smooth as the cold-drawn steel pipe.
Cold-drawn steel pipes have the following characteristics:
6. The crystal structure is compact, the grain size is relatively small, and the dimensional accuracy is high.
7. The internal stress is lower, and the tensile strength, hardness and toughness are better than those of hot rolled steel pipes.
8. Smooth surface, no oxide layer and skin effect.
9. Difference of mechanical properties: The mechanical properties of hot-rolled steel pipes are relatively poor due to the influence of high-temperature plastic deformation in the manufacturing process. Common hot rolled steel pipes include hot rolled seamless steel pipes and hot rolled welded steel pipes.
Due to the cold working and drawing process, the internal structure of cold-drawn steel pipe is denser and the mechanical properties are relatively better. Cold-drawn steel pipes usually have excellent tensile strength, hardness, wear resistance and toughness. Common cold-drawn steel pipes include cold-drawn seamless steel pipes and cold-drawn welded steel pipes.
10. Different application fields: hot-rolled steel pipes and cold-drawn steel pipes have different application fields because of their different manufacturing processes and physical properties.
Hot rolled steel pipes are often used in general structural engineering, hydraulic equipment, mechanical processing, automobile manufacturing and other fields. Hot rolled steel pipe can provide lower cost and higher production efficiency, and is widely used in various industries.
Because of its excellent mechanical properties and dimensional accuracy, cold-drawn steel pipes are often used in demanding fields, such as automobile parts, precision instruments, high-precision machining, hydraulic cylinders, oil casings and so on. Cold-drawn steel pipes usually require high quality and high cost. ? There are some differences between hot-rolled steel pipe and cold-drawn steel pipe in manufacturing process, physical properties, mechanical properties and application fields. According to specific requirements, suitable steel pipe materials can be selected to meet the requirements of related engineering projects or products.