Description
Cold Drawn Carbon Steel Tube ASTM A556
Introduction
ASTM A556 SA556A2 SA556B2 SA556C2 seamless cold drawn carbon steel tubes are specifically designed for use in feedwater heaters. These tubes are widely used in power plants and other industrial applications where high-pressure and high-temperature conditions are present. This article provides an overview of the material, specification, key features, chemical composition, mechanical properties, steel grade, application, and possible alternative grades for these tubes.
Material and Specification
The ASTM A556 SA556A2 SA556B2 SA556C2 seamless cold drawn carbon steel tubes are manufactured according to the ASTM A556/ASME SA556 standard. This specification covers minimum-wall-thickness, seamless cold-drawn carbon steel tubes for use in tubular feedwater heaters. The tubes are available in three different grades: SA556A2, SA556B2, and SA556C2.
Key Features
- Seamless construction: These tubes are produced without any welding or joining, ensuring a smooth and continuous surface.
- Cold drawn process: The tubes are manufactured using a cold drawing process, which enhances their dimensional accuracy and surface finish.
- High strength: The carbon steel material used in these tubes provides excellent strength and durability.
- Corrosion resistance: The tubes are designed to resist corrosion, making them suitable for use in feedwater heaters.
Chemical Composition
| Element | SA556A2 (%) | SA556B2 (%) | SA556C2 (%) |
|---|---|---|---|
| Carbon (C) | 0.15-0.25 | 0.15-0.25 | 0.15-0.25 |
| Manganese (Mn) | 0.60-1.00 | 0.60-1.00 | 0.60-1.00 |
| Phosphorus (P) | 0.035 max | 0.035 max | 0.035 max |
| Sulfur (S) | 0.035 max | 0.035 max | 0.035 max |
| Silicon (Si) | 0.10-0.35 | 0.10-0.35 | 0.10-0.35 |
Mechanical Properties
| Property | SA556A2 | SA556B2 | SA556C2 |
|---|---|---|---|
| Tensile Strength | 380-520 MPa | 450-580 MPa | 520-650 MPa |
| Yield Strength | 205 MPa min | 275 MPa min | 345 MPa min |
| Elongation | 30% min | 30% min | 30% min |
| Hardness | HRB 80 max | HRB 85 max | HRB 90 max |
Steel Grade
The ASTM A556 SA556A2 SA556B2 SA556C2 seamless cold drawn carbon steel tubes are classified into three different grades based on their chemical composition and mechanical properties. These grades are SA556A2, SA556B2, and SA556C2.
Application
These seamless carbon steel tubes are primarily used in feedwater heaters, which are essential components in power plants. Feedwater heaters are used to preheat the water before it enters the boiler, improving the overall efficiency of the power generation process. The ASTM A556 SA556A2 SA556B2 SA556C2 tubes are specifically designed to withstand high-pressure and high-temperature conditions, making them suitable for this critical application.
Possible Alternative Grades
While the ASTM A556 SA556A2 SA556B2 SA556C2 tubes are widely used in feedwater heaters, there are alternative grades available for specific requirements. Some possible alternative grades include ASTM A192, ASTM A210, and ASTM A213. These grades may have different chemical compositions and mechanical properties, so it is important to consult the specific requirements of the application before selecting an alternative grade.
