Features:
1. Seamless low carbon steel pipe is carbon steel with carbon content less than 0.25%. It is also called low carbon steel because of its low strength, low hardness and softness.
2. The annealed structure of seamless low carbon steel pipe is ferrite and a small amount of pearlite, with low strength and hardness, good plasticity and toughness.
3. Seamless low carbon steel pipe has good cold formability, which can be formed by pressing, bending and stamping.
4. Seamless low carbon steel pipe has good weldability. Easy to accept all kinds of processing, such as forging, welding and cutting.


Heat treatment:
The seamless low carbon steel pipe has a great tendency of aging, quenching and aging, as well as deformation and aging. When steel is cooled from high temperature, carbon and nitrogen in ferrite are supersaturated. Carbon and nitrogen in iron can be formed slowly at room temperature, which improves the strength and hardness, ductility and toughness of steel. This phenomenon is called quenching aging. Seamless low carbon steel pipes will have aging effect even without quenching. Seamless deformation of low carbon steel tube will produce a large number of dislocations. Carbon and nitrogen atoms in ferrite interact with dislocation elasticity, and carbon and nitrogen atoms gather around the dislocation line. This combination of carbon and nitrogen atoms and dislocation lines is called Cochrane gas mass (Kelly gas mass). It increases the strength and hardness of steel and reduces ductility and toughness. This phenomenon is called deformation aging. Deformation aging is more harmful to ductility and toughness of low carbon steel than quenching aging. The tensile curve of low carbon steel has obvious yield point. From the upper yield point of the yield point to the end of the yield extension, the surface fold band formed on the surface of the sample due to inhomogeneous deformation is called Rydes band. Many stamping parts are often scrapped. There are two ways to prevent it. The high pre-deformation method is used to place the pre-deformed steel for a period of time, and the Rudes strip is also produced during stamping. Therefore, the pre-formed steel should not be placed too long before stamping. The other is to add aluminium or titanium to steel to form a stable compound with nitrogen to prevent deformation and aging caused by the formation of Kodak gas masses.