ASTM A53 vs A106 Steel Pipe

erw carbon steel pipe

ASTM A53 and ASTM A106 are two common standards for steel pipe, and they have some differences in terms of usage scenarios, materials, and manufacturing processes. Understanding these differences is important for the proper selection and use of steel pipe.

ASTM A53 VS A106 Application Scope

ASTM A53: It is mainly used for the transmission of fluids, such as water, oil, natural gas, etc. It is usually made of carbon steel or low alloy steel.ASTM A53 is usually used in piping systems, such as water pipelines, oil pipelines and natural gas pipelines, etc. 

ASTM A106: Mainly used for high temperature and high pressure steam transmission, usually made of high alloy steel.ASTM A106 is usually used in the manufacture of heat pipes, steam pipes and boiler pipes, etc. 

ASTM A53,ASTM A106 Grade and Type

– ASTM A53 Type F, Furnace Butt Weld Continuous Welded Pipe. Grade a only

– ASTM A53 Type E, Resistance Welded, Pipe Welded with Weld Heat Treated to a Minimum of 540°C After Welding. grades a and b

– ASTM A53 Type s, Seamless Pipe Extruder. grades A and B

ASTM A53 has two grades, Grade A and Grade B. Ground supplies special wood outside the collection.

NOTE: Ground supplies special wood outside the collection of fast measuring pipe in the day4.3 Resistance welded seamless tubes of class B shall be heat-treated after welding at a minimum temperature of 1000F(540 ° C) so that no untempered martensite is present, or treated in such a manner so that no untempered martensite is present.

ASTM A106 Grade A, B, C


The major difference between the three grades is the carbon content, the higher the grade, the higher the carbon content.

astm a53

ASTM A53, A106 Dimensions

ASTM A53:50-600[DN]
When the tube is cold expanded, the expanded part should not exceed 1.5% of the specified outer diameter of the tube.

ASTM A106:6-1200[DN]
Weight:  The weight of the pipe of any length shall not exceed 10% of the prescribed weight and shall not be less than 3.5% of the prescribed weight.
Thickness:  The percentage of the minimum wall thickness at any point less than the specified nominal wall thickness shall not be greater than 12.5%.

ASTM Standard Pipe Chemical Properties

One fundamental difference lies in the chemical composition requirements of ASTM A53 and ASTM A106.

The main difference between the two is in: the content of manganese, phosphorus and sulphur. In comparison, astm a53 has relatively high levels of all three.

StandardsASTM A53ASTM A106
ElementsType S (Seamless) Grade BType E (ERW) Grade BGrade AGrade BGrade C
Carbon max. %0.30*
Manganese %
Phosphorous, max. %
Sulfur, max. %0.0450.0450.0350.0350.035
Copper, max.%
Nickel, max. %
Chromium, max. %
Molybdenum, max. %
Vanadium, max. %

Mechanical properties of ASTM A53 and ASTM A106

Another critical aspect to consider is the variation in mechanical properties between ASTM A53 and ASTM A106. 

ASTM A53 pipes are designed for mechanical and pressure applications, featuring a minimum yield strength of 30,000 psi and minimum tensile strength of 48,000 psi.

In contrast, ASTM A106 pipes exhibit higher strength characteristics, with a minimum yield strength of 35,000 psi and minimum tensile strength of 60,000 psi.

ASTM A53 vs A106 Pipe Testing & Inspection

TestingASTM A53ASTM A106
Tensile Testing
Bending test 
Flattening test
Hydrostatic test
Non-destructive electrical test

Bend Test

For NPS 2 (DN50) or smaller tubing, a sufficient length of tubing shall be capable of being cold bent 90 degrees around a cylindrical mandrel 12 times the diameter of the outside diameter of the specified tubing without breakage of the bent portion and without cracking of the weld.
If closed winding is required, the tubing shall be capable of being cold bent 180 degrees around a cylindrical mandrel 8 times the diameter of the outside diameter of the specified tubing, and no problems shall occur during the process.

Flattening test

Resistance welded pipe: It shall be flattened at a position 90 degrees to the direction of force on the weld. When the distance between the two plates is less than the calculated value, it is sufficient that no cracks shall appear on the inner surface, outer surface or end face.
Seamless Tubing: For seamless tubing, specimens at least 21/2 inches (60 mm) in length shall be cold pressed in two steps on two parallel plates.

Hydrostatic Testing

For NPS 3 (DN80) or smaller pipe, the minimum pressure required to meet the hydraulic test requirements of 8.2 does not exceed 2,500 psi (17,200 kPa).
For steel pipe NPS 3 (DN80) or larger, the minimum pressure required does not exceed 2,800 psi (19,300 kPa). Hydraulic test pressure should be maintained for a minimum of 5 seconds

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