Square tube, as the name implies, it is a kind of form of tube type, a lot of kinds of material of material can make the tube body, it is medium in, what, in what place, most of the square tube steel tube, for most, after unpacking, smooth, curly, form circular tube welding, again by circular tube rolling into square tube and then cut into required length. It is generally 50 square tubes per package in spot with large specifications in the majority of 10*10*0.8-1.5~~500*500*10-25, square tubes are divided into structural square tubes, decorative square tubes, construction square tubes, mechanical square tubes and so on
Development history of square tube
Early Stage (1904 -- 1934)
In this period, the technology of continuous rolling pipe is not mature.
The Second Stage (1934 -- 1950)
Floating mandrel and square tube technology gradually mature period.
Phase III (1961-1978)
Floating core - holding continuous - rolling pipe set was in its heyday.
The Fourth Stage (1978-1992)
A total of 11 sets of MPM and 2 sets of MRK pipe rolling mills were formed in the plant