ASTM A556 Superheater Steel Tube

ASTM A556 / A556M – 96(2012) Standard Specification for Seamless Cold-Drawn Carbon Steel Feedwater Heater Tubes

ASTM A556 Superheater Steel Tube

ASTM A556is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

Stainless steel tube for heat exchanger

1.1 This specification2 covers minimum-wall-thickness, seamless cold-drawn carbon steel tubes including bending into the form of U-tubes, if specified, for use in tubular feedwater heaters.

1.2 The tubing sizes covered shall be 5/8 to 11/4-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].

1.3 Optional supplementary requirements are provided, and when desired, shall be stated in the order.

1.4 The values stated in either inch-pound units or SI units are to be regarded separately as the standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.


Method: Cold Drawn
Delivery Condition: NBK, Bright, U bending.

Chemistry Composition
Grade C % Si % Mn % P % S %
B2 0.27 max 0.10 min 0.29-0.93 0.030 max 0.030 max
C2 0.30 max 0.10 min 0.29-1.06 0.030 max 0.030 max
Mechanical Properties
Grade Tensile Strength MPa Yield Strength MPa Hardness HRB
B2 410 min 260 min 79 min
C2 480 min 280 min 89 min

Tolerances according to specification or according to agreement. Standard tolerances are:

Hot finished OD +/- 1% WT +/-12.5%
Cold finished OD +/-0.75% WT +/-10%