How to check the quality of hot rolled seamless pipe

How to test the quality of hot rolled seamless steel pipe?

1. High quality inspection of permeable layer and core. Check whether the strength of the surface and the core meets the technical standards, whether the gradient direction of the intensity conversion from the surface to the interior is effective, and whether the surface strength is consistent;

2. Check the shape change and crack of the hot-rolled seamless pipe. The seamless steel pipe that has been cut after nitriding, heat treatment and quenching can be produced and processed immediately if the shape variable is within the specified range. For deformation deviations, straightening should be performed. Cracked seamless steel pipes are usually broken and resolved immediately.

3. Raw material inspection of hot-rolled seamless pipe. In addition to the composition analysis, it is also necessary to check the defects of the strip mechanism, non-metallic materials, impurities, cracks and other mechanisms;

4. Check the distribution and grade identification of the metallographic structure of the heart;

5. Permeation layer quality inspection. Including carburized layer depth 1. Carbon concentration value of carburized layer, cementite distribution, retained martensite, austenite morphology and its grade identification, etc.