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What is a galvanized round steel pipe? What is a pre-galvanized square steel pipe?

Galvanized round steel pipe


Concept


Galvanized round steel pipe is a welded round steel pipe with a hot-dipped or electro-galvanized surface.


Difference with ordinary steel pipe


1, the difference in manufacturing process: galvanized round steel pipe and ordinary steel pipe are two categories of steel pipe, galvanized refers to the surface of the steel pipe galvanized treatment, ordinary steel pipe is not.

2, the difference in durability: galvanized round steel pipe corrosion resistance, ordinary steel pipe can withstand higher pressure. Galvanized round steel pipe is not easy to rust because of the protection of zinc, galvanized round steel pipe is lighter than the general steel pipe.

3, the difference in use: galvanizing can increase the corrosion resistance of steel tubes, extending the service life. the anti-corrosion years of hot-dip galvanizing are long-term, but the years of anti-corrosion are different in different environments: 13 years in heavy industry, 50 years in the ocean, 104 years in the suburbs, and 30 years in the city.


Galvanized round steel pipe has a wide range of uses, in addition to being used as a pipeline for general low pressure fluids such as water, gas and oil, it is also used as an oil well pipe and oil pipeline in the petroleum industry, especially in the marine oil fields, as an oil heater, condensation cooler and coal distillation and oil washing exchanger for chemical coking equipment, and as a support frame pipe for trestle piles and mining pits.


Ordinary steel pipe's are now basically replaced by galvanized steel pipe.



Galvanized round steel pipe classification


Galvanized steel pipe is divided into cold galvanized steel pipe, hot galvanized steel pipe, cold galvanized steel pipe has been banned


1. Hot-dip galvanized round steel pipe.


Brief introduction


Hot-dip galvanized round steel pipe is made by reacting molten metal with iron substrate to produce an alloy layer, thus combining both the substrate and the plating. Hot-dip galvanizing has the advantages of uniform coating, strong adhesion and long service life.

Production process


Hot-dip galvanized round pipe is made by reacting molten metal with iron substrate to produce an alloy layer, thus combining both the substrate and the plating layer. Hot dip galvanizing is first pickling the steel pipe, in order to remove the iron oxide on the surface of the steel pipe, after pickling, it is cleaned by ammonium chloride or zinc chloride aqueous solution or ammonium chloride and zinc chloride mixed aqueous solution bath and then enters the hot dip galvanizing bath. Hot dip galvanizing has the advantages of uniform coating, strong adhesion and long service life. A complex physical and chemical reaction occurs between the hot dip galvanized steel pipe and the molten plating solution to form a tightly structured corrosion-resistant zinc-iron alloy layer. This alloy layer is combined with the pure zinc layer and the steel pipe matrix, so its corrosion resistance is very strong.


Application situation


Hot-dip galvanized round steel pipes are widely used in manufacturing industries such as construction, machinery, coal mining, chemical industry, electric power, railroad vehicles, automobile industry, highways, bridges, containers, sports facilities, agricultural machinery, petroleum machinery, prospecting machinery, etc. Welded steel pipes are available with hot-dipped galvanized or electro-galvanized coating. Galvanization can improve the corrosion resistance of steel pipes and extend their service life. Galvanized steel pipe has a wide range of uses, except for general low pressure fluids such as water, gas, oil pipelines, but also used as oil well pipes, oil pipelines in the petroleum industry, especially in marine oil fields, oil heaters for chemical coking equipment, condensers, coal distillation wash oil coolers with pipes, and trestle piles, mining tunnels support frame pipes, etc.


2. Cold galvanized steel pipe.


Cold galvanized pipe is galvanized, the amount of galvanization is very little, only 10-50g/m2, and its own corrosion resistance is much worse than that of hot galvanized pipe.


Most of the regular galvanized pipe manufacturers do not use electro galvanizing (cold galvanizing) in order to ensure quality. Only those small enterprises with small scale and outdated equipment use galvanizing, and of course their prices are relatively cheaper.


Cold galvanized steel pipe galvanized layer is electroplated layer, zinc layer and steel pipe substrate independent of each other. The zinc layer is thin, and the zinc layer simply adheres to the steel pipe substrate and falls off easily. Therefore, its corrosion resistance is poor. In new residential buildings, the use of cold galvanized steel pipes as water supply pipes is prohibited.


Pre-galvanized square steel pipe


Concept


When steel components are used in the fabrication of a more complex finished product, they may be galvanized before the final product is assembled. This is This is what is known as pre-galvanization, or "pre-gal". It may also be called "in-line", "continuous", or "mill" galvanizing. galvanizing.


Differences from hot-dip galvanized round steel pipe


In the oil and gas transportation industry, several galvanized materials are specified to provide excellent corrosion resistance. There are three common methods of galvanizing: hot dip galvanizing, pre-galvanizing and galvanizing. The choice of these methods will depend on the application of the final the application environment of product.


Hot dip galvanized pipe is the tube after manufacturing immersed in the plating solution. The thickness of the zinc coating is affected by a number of factors, including the surface of the steel, the time it takes to immerse the steel in the bath, the composition of the steel, and the size and thickness of the steel.


One advantage of hot dip galvanization is that it covers the entire part, including edges, welds, etc., thus providing a full range of corrosion The final product can be used outdoors in all different weather conditions. This is the most popular method of galvanizing and is widely used in the construction industry.


One of the advantages of pre-galvanized square steel over hot-dipped galvanized steel is its better appearance. Pre-galvanized materials can be used in a variety of products, including conduit, lip and open channels.





Service life in different atmospheres:




Where can I buy galvanized round steel pipes and pre-galvanized square steel pipes? 

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