An on-line oil injection lubrication system of a small-caliber cold pipe blank unit comprises at least one intelligent oil supply assembly. The intelligent oil supply assembly comprises an upper industrial personal computer, a vector frequency converter and a hydraulic pump. The upper industrial personal computer adjusts the quantity of oil supplied by the hydraulic pump to the pipe blank inner hole oil injection assembly and/or the pipe blank outer surface oil injection assembly through the vector frequency converter. The on-line oil injection lubrication system can remarkably improve the quality of inner and outer surfaces of small-caliber stainless steel pipes and effectively solves various surface quality problems such as rolling burrs, rolling folds and micro-cracks caused by oil loss of the inner and outer surfaces of the small-caliber stainless steel pipes during the large-deformation rolling process.

A modular spray bar system (1) for selectively cooling and/or lubricating rolls, in particular roll barrels, in a rolling mill stand includes different types of blocks and a bracing element by which a spray bar (47) formed from the different blocks can be braced.

A modular spray bar system (1) for selectively cooling and/or lubricating rolls, in particular roll barrels, in a rolling mill stand includes different types of blocks and a bracing element by which a spray bar (47) formed from the different blocks can be braced.