20*20 pre-galvanized square steel tube hollow structure section square steel pipe for fence

• Specification of square hollow section we can supply

• Specification of Rectangular hollow section we can supply

How to produce HDG SHS and RHS tubing?

Hot-dip galvanizing is a form of galvanization. It is the process of coating iron or steel with a thin zinc layer, by passing the steel through a molten bath of zinc at a temperature of around 860 °F (460 °C).

When exposed to the atmosphere, pure zinc reacts with oxygen to form zinc oxide, which further reacts with carbon dioxide to form zinc carbonate, a dull grey, fairly strong material that stops further corrosion in many circumstances, protecting the steel below from the elements. The process of hot-dip galvanizing results in a metallurgical bond between zinc and steel with a series of distinct iron-zinc alloys.

What can we do with hot dipped square & rectangular tube?

Hot dipped galvanized rectangular hollow section is widely used all over the world,and we mainly used this square tube in these indusrty area,such as:

        • Glass curtain wall;

        • power tower;

        • communication grid;

        • water and gas transmission;

        • wire casing;

        • houses;

        • bridges;

        • metal structures;

Our company covers an area of 48,800 square meters and we are specialized in exporting.We have ISO:9001,14001,18001 certifications and SGS, API certifications.Presently we have four production lines,260 staff and 36 senior engineers,which make our product capacity reaches 100,000 tons.Since our company was founded, we have won national qualified products, quality entrusted unit, model unit, and China Enterprise Credit Association AAA Grade Credit Enterprise.