ASTM A179 Seamless U-Bend Boiler Heat Exchanger Steel Tubes
Material
ASTM A179 is a specification that covers minimum-wall thickness, seamless cold-drawn low-carbon steel tubes for tubular heat exchangers, condensers, and similar heat transfer apparatus. These tubes are intended for use in heat exchanger applications where the tubes are subjected to high temperatures and pressure conditions.
Specification
The ASTM A179 specification outlines the following requirements for seamless U-bend boiler heat exchanger steel tubes:
- Size Range: The tubes shall be supplied in sizes ranging from 1/8 to 3 inches [3.2 to 76.2 mm] in outside diameter.
- Wall Thickness: The minimum wall thickness of the tubes should be 0.035 inches [0.89 mm].
- Length: The tubes should be supplied in fixed lengths or in random lengths ranging from 16 to 22 feet [4.88 to 6.7 meters].
Ends: The tubes should have plain ends or beveled ends for welding.
Chemical Composition
The chemical composition of ASTM A179 steel tubes should conform to the following requirements:
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.06 - 0.18 |
| Manganese (Mn) | 0.27 - 0.63 |
| Phosphorus (P) | 0.035 (max) |
| Sulfur (S) | 0.035 (max) |
| Silicon (Si) | 0.25 (max) |
Mechanical Properties
The mechanical properties of ASTM A179 steel tubes are specified as follows:
| Property | Minimum Value |
|---|---|
| Tensile Strength | 325 MPa [47 ksi] |
| Yield Strength | 180 MPa [26 ksi] |
| Elongation | 35% (min) |
| Hardness (HRB) | 72 (max) |
Steel Grade
The steel grade used in ASTM A179 seamless U-bend boiler heat exchanger steel tubes is Grade A.
Application
ASTM A179 seamless U-bend boiler heat exchanger steel tubes find application in various industries where efficient heat transfer is required. Some common applications include:
- Boiler tubes: These tubes are used in boilers to transfer heat from the combustion chamber to the water or steam circulating inside.
- Heat exchangers: The tubes facilitate the exchange of heat between two fluids, enabling efficient energy transfer.
- Condensers: A179 tubes are employed in condensers to convert steam into liquid form by extracting heat.
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