Seamless steel pipe requirement for automatic rolling machine

If you want to have hot-rolled seamless steel pipe with high quality, then you have to prepare nice automatic rolling machine for the pipeline’s production. To some extent, there are some demands for it.

First of all, we should pay attention to pipe’s diameter. Tube bending of any part of the it should be ≤6mm / m, tube end face of the cut slope ≤6 ~ 8mm, flattened tube end face of ≤8% Dp;

Then, tube surface needs to be without cracks, hairline, scarring, scaly layer, folding, non-metallic inclusions and residual shrinkage. Not allowed height or depth of more than 0.5mm small grooves, pitting, ears and height of more than two-sided ears of 1mm. Cleanup tube defects deeper than 0.05Dp;

What’s more, low magnification tube should not allowed ≥1 level of residual shrinkage, bubbles, anti-leather, white spots and cracks. For the average carbon structural steel billet, which generally loose ≤3 level, center porosity ≤3 level, segregation ≤3 level, subcutaneous bubbles ≤2.