ASME SA556 A2 seamless feedwater heater tubes are carbon steel tubes that are designed according to the ASME/ASTM A556/A556M specification.
ASME SA556 A2 seamless feedwater heater tubes are carbon steel tubes that are designed according to the ASME/ASTM A556/A556M specification. This specification covers minimum wall thickness, seamless cold-drawn carbon steel tubes, including U-tubes, for use in tubular feedwater heaters.
The tubing sizes covered by ASME SA556 A2 shall be 5⁄8 inch to 1-1⁄4 inch [15.9mm to 31.8mm] outside diameter, inclusive, with minimum wall thicknesses equal to or greater than 0.045 in [1.1 mm]. The manufacturing process used for these tubes is the seamless process, which involves cold drawing.
ASME SA556 A2 seamless feedwater heater tubes are designed for use in feedwater heaters, which are heat exchangers used to preheat water before it enters a boiler to generate steam. These tubes have a high resistance to corrosion and are suitable for use in high-pressure and high-temperature environments.
ASME SA556 A2 Seamless Cold-Drawn Carbon Steel Feedwater Heater Tubes covers minimum-wall-thickness,seamless cold-drawn carbon steel tubes including bending into the form of U-tubes,, for use in tubular feedwater heaters.
ASME SA556 A2 tubing sizes covered shall be 5 ⁄ 8 to 1 1 ⁄ 4 -in. [15.9 to 31.8-mm] outside diameter, inclusive, with minimum wall thicknesses equal to or greater than 0.045 in. [1.1 mm].
Cold-drawn tubes shall be heat treated after the final cold-draw pass at a temperature of1200°F [640°C] or higher to ensure ductility satisfactory for rolling into tube sheets and to meet mechanical properties as specified.
If stress-relief anneal of the U-bends is specified, the anneal shall consist of heating the bent portion within a range of 1100 to 1200°F [585 to 640°C].
| Grade | C | Si | Mn | P | S |
| SA-556M A2 | ≤0.18 | -- | 0.27-0.63 | ≤0.035 | ≤0.035 |
| Mechanical properties | Grade A2 |
| Tensile strength, min, ksi [MPa] | 47 [320] |
| Yield strength, min, ksi [MPa] | 26 [180] |
| Elongation in 2 in. or 50 mm, min, % (longitudinal) | 35 |
| Hardness | HR B 72 |
When requested in the purchase order, a product analysis will be made by our from one tube or billet per heat.
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