Why ERW steel pipe Equipments Are Being Introduced

Why ERW steel pipe Equipments Are Being Introduced

Now, a lot of metallurgical equipments in our country can be designed, manufactured and integrated by ourselves. After China jointly designing with foreign countries and summarizing the experiences and lessons of installation, commissioning, usage, maintenance, and transformation of foreign equipments, our current design has reached a high level. 

China with manufacturing capabilities can design and manufacture the world-class advanced metallurgical equipment, especially the ERW (Electrical Resistance Weld) Steel Pipe equipments under present design condition and environment. Then, why some products, especially for high-producing, high automated advanced continuous rolling pipe equipment units, are still need to be introduced? The main problem is the level of the equipment and stability, namely many accidents, poor stability and more slowly production speed.

There is a big problem that is: domestic equipments are cheap and fast. In order to seek for cheap and fast products, it is easy to reduce design level and manufacturing cost, shorten the design and debugging cycle. Therefore, the level is decreased accordingly. In addition, in order to seek for stability, our large state-owned enterprises are generally not willing to bear the liability for risk. This could be the current reason that domestic equipments can only be introduced among the private enterprises.

In addition, we should also be clear that all the highly automated and advanced equipment with high performance are not only be designed and manufactured. They all need serious debugging, commissioning and certain amount of time to a test run. This is an insurmountable stage and only in this way, domestic equipments can march towards a higher level. ERW Steel Pipe production equipments in China now are the time to enter the international market. Some developing countries, especially those who have the iron ore resources, are considering starting building ERW Steel Pipe, factory in dealing with the global crisis as this is a rare opportunity. 


The advantages of hot-dip galvanizing

The advantages of hot-dip galvanizing
1, the processing cost is low: the cost of hot-dip galvanized anti-rust coating than other low cost of paint;
2, durable: in the suburban environment, the standard hot-dip galvanized anti-rust thickness can be maintained for more than 50 years without having to repair; in urban or coastal areas, the standard hot dip galvanized layer can be maintained for 20 years without repair ;
3, the reliability is good: galvanized steel pipe and steel is metallurgical combination, as part of the steel surface, so the durability of the coating is more reliable;
4, the coating toughness: galvanized layer to form a special metallurgical structure, this structure can withstand the mechanical damage during transport and use;
5, a comprehensive protection: plating of each part can be plated with zinc, even in the depression, sharp corners and hidden place can be fully protected;
6, save time and effort: galvanizing process than other coating construction method is more efficient, and can avoid the installation site after brushing the time required.
7, the initial low cost: Under normal circumstances, the cost of hot-dip zinc coating than other protective agents is lower, the reason is very simple, other protective coatings such as sand paint is a labor-intensive processes, on the contrary hot zinc process is high Mechanization, close control of the plant construction.
8, the test is simple and convenient: hot dip zinc layer can be visual and simple non-destructive coating thickness table for testing
9, reliability: hot dip zinc specifications are generally in accordance with the BS EN ISO 1461 implementation, limits its minimum zinc layer thickness, so the rust-proof period and performance is reliable and predictable.


Galvanized Steel Pipe Washing

Galvanized Steel Pipe Washing

1) steel pipe washing in the flow of water tank, the water should be all immersed in water, pickling straps to relax, ups and downs three to four times.
2) After washing, the pipe should be water control net as soon as possible solvent treatment to prevent the oxidation of steel.
3) cleaning water iron salt content standards may not exceed the standard, no other debris, keep clean and transparent.
4) in the washing tube, the operator is strictly prohibited across the pickling tank to prevent slipping or fall into the acid tank wounding.

Galvanized Steel Pipe Pickling

The main reasons for the pickling of steel pipe:
(1) when the steel pipe in the feed to be strictly checked, to do not put into acid pickling unqualified steel pipe. .
(2) steel pipe in the vibration is not careful operation.
(3) pickling time and lack of hydrochloric acid content.

The main reasons for the steel pipe over pickling:
(1) hydrochloric acid content is too high.
(2) pickling time is too long.

After pickling the outer surface of steel pipe is smooth, with or without residual iron oxide, with or without grease pollution of steel pipe surface.