Annealed steel pipe is a steel pipe welded by Annealed steel strip. When the cold rolled strip is heated to the annealing temperature and the surface color becomes black due to high temperature contact with air, it is called black retreated strip. Its surface is not polished, so it is black. Physical properties soften. The annealed steel strip is welded into annealed steel pipe. The common hardness is 57HRB, which can also be reduced to different hardness as required. Annealed steel pipe is a kind of annealed thin-walled steel pipe. Soft physical properties. It can achieve the effect of no crack in bending and no opening in flaring. Black return pipe is treated A3 material pipe. The purpose is not to rust. It is mainly used for bicycles, tricycles and all light-weight vehicles.

Production process

1. Cold rolled strip annealing into annealed steel strip
2. Annealed steel strip is welded into annealed steel pipe
3. Product testing
4. Shipment by packing truck

Main application

1. Furniture
2. Bicycle
3. Iron art