Cold drawn seamless tubing is a steel pipe with high dimensional accuracy and good surface finish for mechanical structure and hydraulic equipment.

Production process of cold drawn seamless tubing

Round tube billet→heating→piercing→heading→annealing→pickling→oiling (galvanizing)→multi-pass cold drawing (cold rolling)→billet tube→heat treatment→straightening→hydrostatic test (flaw detection)→marking→insertion library.

The basic principle of hot-dip galvanizing in the process of cold drawn seamless tubing

1) Basic principles of organic chemistry of hot-dip galvanizing

In the plating tank filled with hot-dip galvanizing liquid, the parts to be plated that have undergone cleaning and unique preparatory treatment are used as the negative electrode, and the anodic oxidation is made of plated metal materials. connect. The hot-dip galvanizing solution for large-scale cold-drawn seamless pipes is composed of a solution of chemical substances, conductive acid salts, buffers, pH adjusters and preservatives with coating metal materials. After the power supply is connected, the metal material in the hot-dip galvanizing solution is ionized and moved to the negative electrode under the effect of the potential difference to produce a coating. The anodized metal material is ionized into the hot-dip galvanizing solution to maintain the ionized concentration value of the plated metal material. During hot-dip galvanizing, the quality of anodizing raw materials, the composition of hot-dip galvanizing liquid, temperature, current intensity, power connection time, mixing compressive strength, dissolved residues, and switching power supply waveforms are all harmful to the quality of the coating. Manipulation must be done in moderation.

2) The basic principle of the processing technology of hot-dip galvanizing

In the rotating drum equipped with plated parts, glass marbles, zinc powder, water and vulcanization accelerator, the glass marbles as impact substances rotate with the drum, and friction and beating with the surface of the plated parts cause mechanical damage. The physical kinetic energy of the equipment, under the effect of the organic chemical vulcanization accelerator, "cold-welds" the plated zinc powder to the surface of the plated parts, resulting in a smooth, uniform and delicate coating with a certain thickness.