Transverse **** prevention measures

A, improve the quality of billet heating

(1) in accordance with the technological requirements of heating, heating and USES the maximum temperature, put an end to low heat. As for carbon steel (**** 1 ~ 45. The heating temperature of billet were 20 ~ 30 ℃ higher than that of the original process, the effect is better. By statistics, then under the breach of five months
Drop nearly 40%.

(2) for ejecting inclined hearth furnace must be frequently, make the billet heated evenly, put an end to the Yin and Yang. At the same time, I finished after close the oven door, reduce heat loss.

(3) strictly controlled rolling rhythm, to guarantee the billet heating, do not appear "dirty" phenomenon. Avoid even the appearance of perforated black screw.

(4) use high quality heavy oil, ensure the quality of billet heating.

Second, improve the wall thickness accuracy of MAO

(1) the right to adjust perforation, pipe rolling aluminium coated tubes technological parameters, increase the mold precision, such as roll workers make billet and waste pipe deformation in the process of piercing and rolling tube evenly.

(2) adjust centering precise position, install a roller device, can make head on the billet center, avoid perforation eccentric.

(3) good to install roller, will hug plunger and prevent the plunger sink.

(4) for equipment repair system, keep equipment in good condition, ensure that the wall thickness accuracy of MAO.

(5) strengthening the management, often measure the wall thickness, MAO adjustment in time when problems found.

Three, avoid capillary water cooling and cold rolled steel

Good control coordinate production rhythm, make the stainless steel tube 304 tubes before rolling the short residence time on the stage. Ensure steel pipe finishing temperature is not lower than 850 ℃, ensure uniform steel pipe internal organization, reduce the residual stress, the cooling water pressure is moderate, prevent leakage phenomenon, avoid local steel pipe
Water cooling, local cold short phenomenon.

Four, prevent capillary straights and folding phenomenon
Improve the quality of work mould, regularly check the mold, found that workers die wear or undesirable, timely replacement. Regularly check capillary surface quality and find problems and solve in time.

Fifth, improve the quality of capillary grinding

For capillary rolling surface defects such as fold, fold must clean grinding, grinding width than grinding depth 8 times, must after grinding wheel grinding plane with a knife. In order to improve the grinding quality.

Six, capillary grinding after annealing.

(1) due to the poor quality of billet heating or finishing temperature is low, the influence of such factors as steel pipe residual stress and other defects, after capillary annealing, eliminate the residual stress in steel tube, improve the internal organization, to improve the plasticity, easy deformation of cold drawing process.

(2) the steel pipe after grinding, grinding parts of work hardening, the stress concentration, the higher the grinding surface hardness, plasticity, deformation resistance increase. Capillary grinding after Cold Drawn Seamless Tubes annealing, can eliminate work hardening and stress concentration caused by grinding, grinding parts
Can get from other parts of the same good plasticity and easy machining deformation.

(3) capillary annealing after grinding, must conform to the requirements of the annealing process, make the capillary is heated evenly and transparent heart, to make the organization of defective parts condition to fully recover. Eliminate internal stress, lower hardness, higher plasticity.