That means the removal of carbon containing boring oil, lubricating oil and/or grease residues from the surface in a degreasing plant, to avoid carbonizing of the seamless tubes in subsequent annealing. In case oil and grease residues are not removed completely, carbonizing will occur during annealing and thus decrease the corrosion resistance of the finished tube.
1.The removal of grease, suint, and extraneous matter from wool by an aqueous or solvent process. 2. The removal of natural fats, waxes, grease, oil, and dirt from any textile material by means of an organic solvent.