Galvanized Steel Pipes

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Galvanized Steel Pipes Specification

  • Product Type: ASTM A106 Gr.B
  • Product Name: 10 inch STD astm a106 gr.b galvanized steel pipe
  • 10 inch STD astm a106 gr.b galvanized steel pipe
  • size: 10 inch, DN250, 273mm galvanized ERW steel pipe
  • Material: ASTM A106, 20#, Q235, STPY41, STPG38, STB30, STB33, STB35, STPT42 etc
  • Wall Thickness: STD, 8.18mm
  • Standard: ASME/ANSI B26.10M

Type: astm a106 gr.b galvanized steel pipe

Size:

  • Seamless Pipe: 1/2”~24”, DN15~DN600, OD21.3MM~609.6MM, WT: 1-60mm
  • LSAW pipe: 1/2″-48″, DN15-DN1200, OD21.3-1219.2MM, WT: 1-60mm
  • SSAW pipe: 1/2″-48″, DN200-DN3600, OD: 219.1-3657.6mm, WT: 6-36mm

Wall thickness

SGP, STD, SCH40, SCH80, SCH160. XS, XXS and so on.

Standards

ANSI B16.9 / 16.28, ASTM A53/A106, API 5L, ASME B36.10M—1996, DIN2605 / 2615 / 2616, JIS P2311/2312

Material

ASTM A106, A53GRB, A53-A, A106-A, A192, A226, A315-B, A106-B, A178-C, A210-A-1, A210-C, A333-1.6, A334-1.6, A333-7.9, A334-7.9, 150M19, En46..

API 5L X42, X52, X60, X65, X70

Length: 6-12m

Industrial process

hot rolled, hot expanded, cold drawn, and hot galvanized

Surface treatment

Transparent oil, rust-proof black oil or hot galvanized

Galvanized Steel Pipes Usage

Water Pipelines, Agriculture and Irrigation (Water Mains, Sewerage Systems, Industrial Water Lines, Plant Piping, Deep Tube-Wells & Casing Pipes). Other popular application area includes usage in gas pipe lines (pipe lines for natural gas, LPG and other non-toxic gases).

What is Galvanizing?

Galvanizing is one of the most widely used to methods for protecting metal from corrosion. It involves applying a thin coating of zinc to a thicker base metal, helping to shield it from the surrounding environment. The next time you are in your car, take a look at the street signs and lamp posts you pass. A large number of them will have a mute, silver color on them. That “silver” is actually the coating of zinc.

Quite simply, galvanizing a metal gives it anti-corrosion properties. Without the protective zinc coating, the metal would remain exposed to the elements and potentially oxidize and corrode much faster. Galvanized Steel is a cost effective alternative to using materials such as austenitic stainless steel or aluminum in order to prevent corrosion.

How Does It Work?
Galvanizing can protect metal is a number of ways. Firstly, it creates a protective coating that shields the metal from the surrounding environment. The layer of zinc prevents water and moisture and other elements in the air from corroding the steel underneath. Should the zinc coating be scratched deep enough, the metal would become exposed and susceptible to corrosion.

Galvanizing can also protect metal through a process called “galvanic corrosion”. Galvanic corrosion occurs when two metals of a different electrochemical make up are placed into contact with one another with an electrolyte present, such as salty water. Depending on the atomic structure of the two metals, one metal is the anode and the other is the cathode. The anode corrodes more rapidly than it would by itself and the cathode corrodes at a slower pace than it would by itself. The reason zinc is used for galvanizing is because it has an affinity towards being the anode when in contact with many different types of metals. Since the zinc coating in contact with the base metal is usually the anode, it slows the corrosion of the base metal, or the cathode.

Different Methods of Galvanizing
There are several different processes for galvanizing metal:

HOT-DIP GALVANIZING

As the name implies, this method involves dipping the base metal into a molten pool of zinc. First, the base metal must be cleaned either mechanically, chemically, or both to assure a quality bond can be made between the base metal and the zinc coating. Once cleaned, the base metal is then fluxed to rid it of any residual oxides that might remain after the cleaning process. The base metal is then dipped into a liquid bath of heated zinc and a metallurgical bond is formed.

The advantages of this method are that it is economical; it can be performed quickly and to complex shapes. However, the final coating can be inconsistent relative to other galvanizing processes.

PRE-GALVANIZING

This method is very similar to hot-dip galvanizing but is performed at the steel mill, usually on materials that already have a specific shape. Pre-galvanizing involves rolling metal sheet through a similar cleaning process to that of the hot-dip galvanizing process. The metal is then passed through a pool of hot, liquid zinc and then recoiled.

An advantage of this method is that large coils of steel sheet can be rapidly galvanized with a more uniform coating compared to hot-dip galvanizing. A disadvantage is that once fabrication of the pre-galvanized metal begins, exposed, uncoated areas will become present. This means that when a long coil of sheet is cut into smaller sizes, the edges where the metal is cut are left exposed.

ELECTRO-GALVANIZING

Unlike the previous processes, electrogalvanizing does not use a molten bath of zinc. Instead, this process utilizes an electrical current in an electrolyte solution to transfer zinc ions onto the base metal. This involves electrically reducing positively charged zinc ions to zinc metal which are then deposited on the positively charged material. Grain refiners can also be added which helps to ensure a smooth zinc coating on the steel. Similar to the pre-galvanizing process, electrogalvanizing is typically applied continuously to a roll of sheet metal.

Some advantages of this process are a uniform coating and precise coating thickness. However, the coating is typically thinner than the coating of zinc achieved by the hot-dip galvanizing method which can result in reduced corrosion protection.

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