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 make the steel produces large plastic deformation, thus improve the yield point of steel. Hot rolling can destroy the ingot casting organization, grain refining of steel, and eliminating the defects of the microstructure, which makes steel group is close-grained, mechanical performance is improved.

1, metal layered -- steel after cold rolling, the steel internal non-metallic inclusions (mainly sulfide and oxide and silicate) was pressed into thin slices, appear statified phenomenon (sandwich). 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 thickness, familiar with metal heat bilges cold shrink, because at the end of the cold rolling of rolling out even in the steel tube length, thickness, finally after cooling will cause certain negative difference, the negative difference, the greater the wall thickness uniformity of the poor. So for cold rolled seamless steel tube wall thickness, length, straight and ovality can't ask very 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 the deformation, stability, fatigue resistance, etc, are likely to produce adverse effect.

4.Poor surface finish - the tensile marks on the inner surface of the steel pipe are distributed longitudinally, showing symmetry or single straight line folding, some of which exist in general and some exist locally.