Square Hollow Section Pipe

our black pipe is generally manufactured cold formed. as per your specific requirements, we are able to provide hot finished one through distressing, strictly following the standard of en10210. with reference to the treatment for certain large welding seam, we tend to adopt the normalizing processing method for distressing to improve the whole effectiveness of pipes for the actual purposes. you can directly inform us of your various needs, and we will try to follow your requirements for a variety of pipe processing treatments.
our pipes undergo a chromic acid passivation treatment for the surface of galvanized steel pipe. as a rule, hydrogen treatment and passivation treatment are the two major methods for the final effective painting treatment of galvanized pipe, in order to further improve the corrosion resistance of the zinc layer or maintain the original property of the coating. furthermore, it also helps to prolong the durable years of the pipes. generally speaking, our pipes can be used for at least 3 ~ 5 years, sometimes even up to 20 years. in that regard, there alsohas much to do with the specific environment in the actual applications.