ASTM A178 Welded Carbon Steel Welded Steel Pipes For Boiler And Superheater

Instruction

ASTM A178 Welded Carbon Steel Welded Steel Pipes For Boiler And Superheater

 

Introduction
ASTM A178 is a specification that covers electric-resistance-welded carbon steel and carbon-manganese steel boiler and superheater tubes. These tubes are used in various industrial applications where high-temperature and high-pressure conditions are encountered, such as boilers, superheaters, and heat exchangers. This article provides an overview of the material, specification, chemical composition, mechanical properties, steel grades, and applications of ASTM A178 welded carbon steel pipes.

 

Material Specification
ASTM A178 specifies the requirements for electric-resistance-welded carbon steel and carbon-manganese steel tubes, intended for use in boiler and superheater applications. The tubes shall be made from flat-rolled steel with specified chemical composition and mechanical properties.

 

Chemical Composition
The chemical composition of ASTM A178 steel is specified to ensure the desired mechanical properties and corrosion resistance. The following table presents the typical chemical composition of ASTM A178 carbon steel pipes:

Element	Composition (%)
Carbon (C)	0.06 max
Manganese (Mn)	0.27 - 0.63
Phosphorus (P)	0.035 max
Sulfur (S)	0.035 max
Silicon (Si)	0.10 min

 

Mechanical Properties
ASTM A178 carbon steel pipes must possess certain mechanical properties to withstand high-temperature and high-pressure conditions. The mechanical properties are determined through testing of the welded pipes. The following table summarizes the typical mechanical properties of ASTM A178 carbon steel pipes:

Property	Minimum Value
Tensile Strength	325 MPa
Yield Strength	180 MPa
Elongation	35% min
Hardness (HRB)	65 max

 

Steel Grades
ASTM A178 specifies several grades of carbon steel and carbon-manganese steel tubes, including Grade A, Grade C, and Grade D. These grades differ in their chemical composition and mechanical properties, allowing users to select the appropriate grade based on their specific requirements.

 

Applications
ASTM A178 welded carbon steel pipes find extensive applications in the manufacturing of boilers, superheaters, and heat exchangers. These pipes are utilized in power generation plants, chemical processing plants, refineries, and various other industrial sectors where efficient heat transfer and reliable performance are crucial.