ASTM A556 Superheater Steel Tube

　　ASTM A556 Standard Specification is for Seamless Cold-Drawn Carbon Steel Feedwater Heater Tubes.

　　ASTM A556 is 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.

　　Scope:

　　1. This specification 2 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.

　　2. The tubing sizes covered shall be 5/8-11/4 inch (15.9-31.8mm) outside diameter, inclusive, with minimum wall thicknesses equal to or greater than 0.045 inches.

　　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

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