A53 Grade A and Grade B pipes use

A53 Grade A and A53 Grade B are two categories of carbon steel pipes that are used for low-pressure plumbing or other purposes. While each type of pipe features different characteristics, they both share some standard properties.

Chemical composition of ASTM Grade A seamless steel pipe:
(C) 0.25; 
(Si) --- ; 
(Mn) ≤ 0.95; 
 (P) ≤ 0.05; 
 (S) ≤ 0.045; 
(Ni) ≤ 0.40; 
(Cu) ≤0.0.250 ; 
 (Mo) 0.15 ; 
 (V) 0.08

ASTM A53 Grade B chemical properties content 
C≤0.30%, 
Mn≤1.2%, 
P≤0.05%, 
S≤0.045%, 
Cr≤0.40, 
Cu≤0.40, 
Ni≤0.40, 
Mo≤0.40, 
V≤0.08.

 A53 Grade B is often used in industrial applications and is less ductile, but slightly stronger than Grade A. It is usually used for large projects and applications that require a large amount of pressure, such as water and steam lines. Grade B is also frequently used for heating and cooling applications, as well as for transportation of liquids such as oil and gas.
    

In case ASTM A53 Grade B in ERW (electric resistance welded) pipe, the weld seam shall be done the heat treatment with a minimum 1000°F [540°C]. In this way the no untempered martensite remains.

In case ASTM A53 B pipe in cold expanded, then expansion should not exceed 1.5% of the required OD.

 Overall, these two grades are the most common types of carbon steel pipe and are often used in a variety of different applications. While both grades feature different properties and advantages, the most important factors to consider when choosing between them is the size and type of application. Additionally, it’s important to consider the cost of installation, since Grade B is more expensive than Grade A, which could be a deciding factor in the end.

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