Advantages and disadvantages of stainless steel seamless pipe

Forming speed is fast, the yield is high, can be made into a variety of section forms, to meet the needs of the use conditions; Cold rolling can produce a large plastic deformation of steel, Advantages and disadvantages of stainless steel seamless pipe

Advantages:

Forming speed is fast, the yield is high, can be made into a variety of section forms, to meet the needs of the use conditions; Cold rolling can produce a large plastic deformation of steel, thus increasing the yield point of steel. Hot rolling can destroy the casting structure of the ingot, refine the grain of the steel, and eliminate the defects of the microstructure, so that the steel structure is compact and the mechanical properties are improved.

Disadvantages:

1. Metal delamination - when the steel pipe is cold rolled, the non-metallic inclusions (mainly sulfide and oxide, and silicate) inside the steel are pressed into thin sheets, and the delamination (interlayer) phenomenon occurs. Delamination greatly worsens the mechanical properties of steel along the thickness direction, and there is a possibility of interlayer tearing when the weld expands.

2, uneven wall thickness - we know that the metal has thermal expansion and contraction, because the cold rolled steel pipe even in the length and thickness of the end of the rolling, there will still be a certain negative difference after cooling, the greater the negative difference, the worse the uniformity of the wall thickness. Therefore, the wall thickness, length, straightness and ellipticity of cold rolled seamless steel pipe can not be required to be too correct.

3. Residual stress -- Due to uneven cooling, all kinds of steel pipes have residual stress, the larger the steel section size, the greater the residual stress, which has a certain impact on the performance under the action of external force. Such as deformation, stability, fatigue resistance and other aspects may have adverse effects.