METHOD OF PRODUCING SEAMLESS TUBES Russian patent published in 2010 - IPC B21B19/02 

FIELD: process engineering.

SUBSTANCE: invention relates to pipe rolling and can be used at pipe rolling plants incorporating device to pierce billet into hollow shell and reeler with gage made up of mandrel and rolls arranged around the latter, for example pilger mill, push bench, continuous rolling mill and Assel elongator. Proposed method comprises heating the billet, piercing it into shell and rolling in gage on mandrel. In piercing, shell inner surface is shaped to represent alternating ledges and recesses to be completely flattened by rolling.

EFFECT: reduced loads on rolling equipment and assemblies of equipment of piercing and rolling mills, reduced wear of said mills, lower power and metal consumption, higher quality of pipe surface.

3 cl, 1 ex, 2 dwg