Low carbon steel tubing with seamless

Low carbon steel tubing features:

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

Low carbon steel tubing heat treatment：

Low carbon steel tubing with seamless has a large tendency to aging, both quenching and aging tendencies, as well as deformation and aging tendencies. When the steel is cooled from high temperature, the carbon and nitrogen in the ferrite are supersaturated, and the carbon and nitrogen in the iron can be slowly formed at normal temperature, so that the strength and hardness of the steel are improved, and the ductility and toughness are lowered. This phenomenon is called quenching aging. 

Low carbon steel tubing with seamless will have an aging effect even if it is not quenched. The deformation of low carbon steel tubing with seamless produces a large number of dislocations. The carbon and nitrogen atoms in the ferrite interact elastically with dislocations, and carbon and nitrogen atoms gather around the dislocation lines. This combination of carbon and nitrogen atoms and dislocation lines is called the Cochrane gas mass (Kelly gas mass). It increases the strength and hardness of steel and reduces the ductility and toughness. This phenomenon is called deformation aging. Deformation aging is more harmful to the ductility and toughness of low carbon steel than quenching aging. 

There are obvious upper and lower yield points on the tensile curve of low carbon steel. From the upper yield point until the end of the yield extension, a surface wrinkle band formed on the surface of the sample due to uneven deformation is called the Rydes belt. Many stamping parts are often scrapped. There are two ways to prevent it. A high pre-deformation method, the pre-deformed steel is placed for a period of time and the Rudes belt is also produced when stamping, so the pre-deformed steel should not be placed too long before stamping. The other is to add aluminum or titanium to the steel to form a stable compound with nitrogen to prevent deformation aging caused by the formation of Kodak air mass.

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