Causes and Solutions for Cracks In Seamless Steel Pipes

Causes of cracks in seamless steel pipe:
1. The thickness direction of the crack across the slab. The crack in the central equiaxed region is a fine bending crack along the grain boundary. The cracks on the inner arc side are usually straight cracks in the cracks, while the cracks on the outer arc side are usually along the crystal cracks.
2. The crack along the grain boundary is a stress crack, which is a crack through the grain and the result of external force.


What do you need to do to solve this crack?
1. Improve the accuracy of the casting arc, avoid excessive stress on the solid-liquid interface at the early stage of solidification, and prevent cracks along the grain boundary.
2. The forced cooling is realized by properly increasing casting speed and cooling water, increasing water flow and reducing water temperature within a certain range.
3. Strictly control the composition of steel grades, especially the carbon content.
4. Increase electromagnetic stirring of continuous casting. The superheat of the medium clad steel is controlled below 40 ° C.