What is ASTM A795 ERW Pipe?

1.What is ASTM A795 ERW Pipe?

ASTM A795 ERW Pipe is an electric resistance welded pipe produced in accordance with the standards of the American Society for Testing and Materials (ASTM International).

(1)ASTM A795 standard

This specification covers black and hot-dipped zinc-coated (galvanized) welded and seamless steel pipe for fire protection use.
① Size range
The ASTM A795 standard covers steel pipe from NPS (nominal pipe diameter) 1/2 inch to NPS 10 inches.
②Surface treatment
These steel pipes can be black (uncoated) or hot-dip galvanized (GI) to provide additional corrosion resistance.
③Type and grade
ASTM A795 steel pipe is divided into different types (such as Type E) and grades (such as Grade B), each with specific performance requirements.

(2)ERW Pipe

"ERW" stands for resistance welding, a manufacturing process for welding steel pipes that uses resistance heating to fuse the edges of the pipes together to form a weld.

2.Characteristics and applications of ASTM A795 ERW Pipe

(1)Features

①Heat resistance and high pressure resistance
This kind of steel pipe can withstand a certain amount of pressure and high temperature, and can maintain normal functions in extreme environments.
②Corrosion resistance
Galvanized steel pipes can prevent corrosion and extend life in humid and chemical environments.
③Versatility: ASTM A795 ERW pipe is available in a variety of sizes, wall thicknesses, and grades to meet the specific requirements of various applications.

(2)Application

This kind of metal pipe is suitable for indoor fire water supply pipes and outdoor fire water supply main pipes, such as fire hydrants, sprinkler systems, semi-wet automatic sprinkler systems, etc.

3. Surface treatments for ASTM A795 ERW pipe

(1) Hot dip galvanizing

Hot-dip galvanizing melts zinc ingots at high temperatures, puts in some auxiliary materials, and then immerses metal structural parts in a galvanizing bath to attach a layer of zinc to the metal components. Hot dip galvanizing is an effective method of corrosion protection for A795 ERW pipe

Crafting process
Workpiece → degreasing → water washing → pickling → water washing → dipping in plating solvent → drying and preheating → hot dip galvanizing → finishing → cooling → passivation → rinsing → drying → inspection.
 

(2)Electro-galvanized

The purpose of electro-galvanizing is to prevent steel objects from being corroded, improve the corrosion resistance and service life of steel, and also add a decorative appearance to the product. In order to protect the service life of steel pipes or their parts, electro-galvanizing is generally used to Processing. Electrogalvanizing is the most common coating used for commercial fasteners. It is cheaper and has a better appearance. It can be available in blue and white, silver, black, and military green.
 

(3)Powder coating

This method involves applying a dry powder coating to the pipe's surface, followed by curing under heat. Black powder-coated steel pipes are common.
 

(4)Painting

ASTM A795 ERW steel pipes usually need to be painted when used as fire pipes. As a special water supply network, fire protection pipelines have strict requirements and regulations for pipelines, including anti-corrosion performance and meeting certain pressure standards. Therefore, it is necessary to paint the pipes, which not only helps to provide additional corrosion protection, but also makes the pipes easily identifiable among many pipelines. In practical applications, fire pipes are usually painted in eye-catching red. The purpose of this is to quickly identify fire pipes in an emergency and ensure the efficient operation of the fire protection system.

(5) Schedule 40 astm a795
 

(6) Schedule 10 astm a795