Small-caliber cold drawn seamless steel pipe is a hollow cross-section, there is no seam around the round, square, rectangular steel. Seamless steel pipe is made of steel ingots or solid tube through the perforation of the capillary, and then by hot-rolled, cold-rolled or cold dial made. Seamless steel pipe with hollow cross-section, a large number of pipes for the transmission of fluid, steel and round steel and other solid steel compared to the same bending strength, when the weight is light, is an economic section steel, widely used in manufacturing structures And mechanical parts, such as oil drill pipe, drive shafts, bicycle frames and steel scaffolding used in construction.

Anaerobic bright annealing is in the anaerobic furnace, usually in the nitrogen environment, heating, cooling, baked at 300 degrees, so to maintain the original color of the annealing process.

Anaerobic annealing, the steel surface without oxide. Carbon dioxide annealing. There are great benefits, can reduce the appearance of heavy skin, so that the appearance of the tube looks more beautiful. Can save waste. Annealing is a metal heat treatment process, refers to the metal slowly heated to a certain temperature, Time, and then cooling at the appropriate speed. The purpose is to reduce the hardness, improve the cutting processability; eliminate residual stress, stable size, reduce the tendency of deformation and crack; grain refinement, adjust the organization, eliminate tissue defects. Precisely, the annealing is a heat treatment of materials, including metal materials, non-metallic materials. And the annealing of new materials with the purpose of the traditional metal annealing similarities and differences.