? Wuxi Duorunde Steel Pipe Co., Ltd (I'll answer); Hot-rolled steel pipe and cold-drawn steel pipe are two different production processes and processing methods, and there are some differences between them in the manufacturing process, physical properties and application areas. The following will detail the differences between hot rolled steel pipe and cold drawn steel pipe.?
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1. Manufacturing process is different: Hot Rolled Steel Pipe: Hot Rolled Steel Pipe is formed by heating the billet at high temperature to a suitable rolling temperature after rolling. First, the original billet is heated to a higher temperature by a heating furnace, and then continuously rolled through a rolling mill to eventually form a steel pipe of the required size and wall thickness. Cold-drawn steel pipe: Cold-drawn steel pipe is formed by processing the heat-treated steel pipe again at room temperature, and changing the size and wall thickness of the pipe by 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, and the diameter and length are gradually reduced and increased through the cold drawing process to get the required size and wall thickness.
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2. Physical Property Differences:
Hot Rolled Steel pipe has the following characteristics:3. Coarse crystalline organization, relatively large grain size.
4. Higher internal stress, prone to plastic deformation and fracture.
5. Relatively rough surface, not as smooth as cold-drawn steel pipe.
Cold-drawn steel pipe has the following characteristics:
6. Dense crystalline organization, relatively small grain size, higher dimensional accuracy.
7. Lower internal stress, tensile strength, hardness and toughness are better than hot rolled steel pipe.
8. Smooth surface, no oxide layer and skin effect.
9. Differences in mechanical properties: The mechanical properties of hot rolled steel pipe are affected by high temperature plastic deformation in the manufacturing process, and its mechanical properties are relatively poor. Common hot-rolled steel pipe includes hot-rolled seamless steel pipe and hot-rolled welded steel pipe.
Cold-drawn steel pipe has a denser internal structure and relatively better mechanical properties due to the cold working and drawing process. Cold drawn steel pipe is usually characterized by superior tensile strength, hardness, wear resistance and toughness. Common cold-drawn steel pipe includes cold-drawn seamless steel pipe and cold-drawn welded steel pipe.
10. Different applications: Due to the hot-rolled steel pipe and cold-drawn steel pipe differences in the manufacturing process and physical properties of the differences, they are different in the field of application.
Hot rolled steel pipe is commonly used in general structural engineering, hydraulic equipment, machining, automobile manufacturing and other fields. Hot rolled steel pipes offer lower cost and higher productivity and are widely used in various industries.
Cold-drawn steel pipe is commonly used in demanding fields, such as automobile parts, precision instruments, high-precision machining, hydraulic cylinders, petroleum casing, etc., due to its excellent mechanical properties and dimensional accuracy. Cold drawn steel pipe usually has higher quality requirements and higher cost.? There are some differences between hot rolled steel pipe and cold drawn steel pipe in manufacturing process, physical properties, mechanical properties and application areas. According to the specific needs, you can choose the appropriate steel pipe material to meet the requirements of the relevant engineering projects or products.