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ASTM A53 Hot Dipped Galvanized Steel Pipe

Hot dipped galvanized steel pipe is in manufacturing process using steel pipes of removed rust dipped into zinc liquid of 500℃ temperatures, and making steel surface attached zinc layer so as to achieve the purpose of anti-corrosion.
Overview

removed rust dipped into zinc liquid of 500℃ temperatures, and making steel surface attached zinc layer so as to achieve the purpose of anti-corrosion.

Hot galvanizing is a kind of effective anti-corrosive treatment, used in kinds of steel structural products. Since 1836 France used hot galvanizing in industry the first time, it have been more than 180 years. However following by the development of cold rolled steel, it has greatly developed in recent decades. With the high-voltage transmission, transportation, communications, the protection products require higher standards, hot galvanizing demand is also increasing.


The processing of hot galvanizing:

Finished pickling – washing – plating – drying – hanging plating – cooling – medicine – cleaning – grinding – hot galvanized finish.

Zinc thickness for hot galvanized steel pipe

Hot galvanized steel pipe zinc layer thickness is 35μm, and the most thick is up 650μm. Instead cold zinc layer thickness is only 5-15μm. Zinc layer have the effects of anti air corrosion and electric chemical protection.

The theory of hot galvanized steel pipe’s zinc layer effect to anti corrosion

In the processing of hot galvanizing, it will formed a film of zinc-steel alloy layer first, above it is pure zinc layer. When the air corroded the zinc layer, it will form a layer of ZnO, Zn(OH)2 and basic zinc carbonate protection film. Which have the effect of anti air corrosion. When this film was destroyed, a new one will form. When the zinc layer destroyed heavily, zinc start up electric chemical protection. Zinc as the first element dissolved. It’s obviously that hot galvanized  steel have better anti corrosive performances than cold galvanizing pipe.


CHEMICAL REQUIREMENTS ASTM A53


CMnPSCu (1)Ni (1)Cr (1)Mo (1)V (1)
Type S (seamless pipe)
Grade A0.250.950.050.0450.40.40.40.150.08
Grade B0.31.20.050.0450.40.40.40.150.08
Type E (electric-resistance-welded)
Grade A0.250.950.050.0450.40.40.40.150.08
Grade B0.31.20.050.0450.40.40.40.150.08
Type F (furnace-welded pipe)
Grade A0.31.20.050.0450.40.40.40.150.08


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Shandong Quanqiu Steel Group Co., Ltd. is a sophisticated manufacturer of steel products.  The company is located in Jinan, China's largest stainless steel products base, adjacent to Tianjing.  We focus on the steel industry for nearly 15 years, we have a wide range of stainless steel products, is a long-term engaged in stainless steel wholesale, sales, processing, distribution of professional company.  Other metal products are also available if required by customers.  The annual export volume is about 1 million tons.  We promise that almost all inquiries will be handled within three hours.  
In a short period of time, Shandong Quanqiu Steel Group Co., Ltd. in the eastern stainless steel market and the whole stainless steel industry in Shandong enjoys a high reputation.  Has a large customer base from all over the country, and established a long-term cooperative relationship.  Customers involved in petroleum, chemical machinery, electric power, water treatment equipment, elevators, kitchenware, food machinery, pressure vessels, solar water heaters and other industries.  "Punctuality, integrity, humanized service" has been my company and all the staff always strictly abide by the principle of development.  


Main products
We’re the supplier of a wide range of stainless steel products ( ss plate/sheet, ss coil, ss tube/pipe, ss bar/rod of all shapes, channel steel, angel steel and etc),  and other nonferrous metal products. 
Various Standard and non-standard specifications are both available as customers request. All products we provided are strictly in line with the international standards. 
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Shandong Quanqiu Steel Group Co., Ltd.  will serve the majority of users with good reputation, strong strength, high quality products and low price. I would like to express my heartfelt thanks to the old and new friends and customers who have always cared, supported and helped the company! And sincerely hope to establish long-term cooperative relations with them, mutual benefit and common development .

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