The test proves the existence of walling phenomenon and that the shrinkage cavities inside billet are not oxidized to form infoldings.

Problems concerning return circuit of one kind of curve internal zigzag line and tangent;

An Analysis on Inner Overlap of High Anti-Collapse Strength Seamless Casing Tube of Steel 26CrMo4V and Improved Technology Measure;

The influence of over-heat and draw speed on inner fold defects of seamless steel tube is analyzed in hot test process of 20 steel from point of view of inner solidified organization of CC billet.

Endoluminal gasrtroplication for gastroesophageal reflux disease;