The differences between hot rolled seamless steel pipes and cold drawn seamless steel pipes are mainly reflected in manufacturing processes, mechanical properties, dimensional characteristics, and application fields, etc.
1. Different material performance
Cold drawn seamless steel pipe is generally made of high quality carbon steel or alloy steel, which has high strength, hardness, and excellent mechanical properties, but the toughness is relatively poor.
Hot rolled seamless steel pipe is made of low carbon steel or low alloy steel, which has lower strength and hardness than cold drawn seamless steel pipes, but the toughness is relatively rich.
2. Different dimensional characteristics
The outer diameter of cold drawn seamless steel pipes is relatively small and has high dimensional accuracy. The wall thickness is uniform, and the length is usually shorter than hot rolled seamless steel pipes.
Hot rolled process is suitable for manufacturing of large diameter seamless steel pipes, but the dimensional accuracy is relatively poor and the surface is roughness.
3. Application fields
Cold drawn seamless steel pipes are mainly used for manufacturing of pipelines and mechanical parts for high-precision, high-pressure, and high-temperature, such as automotive transmission shafts, turbine engines, and high-pressure vessels, etc
Hot rolled seamless steel pipes are commonly used in fluid transport pipelines that do not require high strength but require good toughness.
In summary, cold drawn seamless steel pipes and hot rolled seamless steel pipes should be selected strictly according to application needs
