The galvanized square tube is a hollow steel tube with a square cross-section shape and size made of hot-rolled or cold-rolled galvanized strip steel or galvanized coil as a blank, which is formed by cold bending and then high-frequency welding.

Precision seamless pipe is a kind of high-precision seamless steel pipe processed by cold drawing or hot rolling. Because there is no oxide layer on the inner and outer walls of the precision steel pipe, it can withstand high pressure without leakage, high precision, high finish, cold bending without deformation, flaring, flattening without cracks, etc.

When welding stainless steel pipes, in order to reduce the tendency of thermal cracking, the microstructure design of the weld generally contains a small amount of ferrite, and the control of the ferrite content is mainly realized by the alloy composition. Austenitic stainless steel welds contain more than 3% ferrite, which can effectively avoid solidification cracks, but too much ferrite will have an adverse effect on performance.

Low-temperature carbon seamless steel pipe is a seamless steel pipe suitable for -45℃~-195℃ low-temperature pressure vessel pipes and low-temperature heat exchanger pipes.

The quality inspection method and steps of stainless steel seamless pipe seamless pipe are divided into seven steps.

Fire-fighting pipeline refers to the pipeline material used for fire-fighting, connecting fire-fighting equipment and equipment, and transporting fire-fighting water, gas or other media.