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ASTM A556

ASTM A556 superheater steel tube

ASTM A556 superheater steel tube

ASTM A556, ASME SA 556 is a common standard specification for seamless cold-drawn carbon steel feedwater heater tubes. It covers minimum-wall-thickness, seamless cold-drawn carbon steel tubes including bending into the form of U-tubes. In order to increase the heating area and prevent heat from being taken away by cooling water in the condenser, the U-bending design is essential. The steel pipe is used for making a water cooling wall of the power plant boiler, it can effectively eliminate the steam film on the inner wall of the steel tube and improve the thermal efficiency of the furnace wall.

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.

This standardis issued under the fixed designation A 556/A 556M; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon ( ュ) indicates an editorial change since the last revision or reapproval.

Scope

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

1.2 The tubing sizes covered shall be 5/8 to 1 2/4-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 hen desired, shall be stated in the order.

1.4 The values stared 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 sated 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. The inch-pound units shall apply unless the “M” designation of this specification is specified in the order.

Chemistry composition of ASTM A556

GradeC %Si %Mn %P %S %
A20.18 ...0.27–0.63 0.035 0.035
B20.27 max0.10 min0.29-0.930.030 max0.030 max
C20.30 max0.10 min0.29-1.060.030 max0.030 max

Mechanical properties of ASTM A556

GradeTensile strength, min, ksi [MPa] Yield strength, min, ksi [MPa]Elongation in 2 in. or 50 mm, min, % (longitudinal)Hardness Requirements
A247 [320] 26 [180] 35 HR B 72
B260 [410] 37 [260] 30HR B 79
C270 [480]40 [280]30HR B 89

Comparison table of international standards

ASTMBSDINNFAJIS
A210 A13602 Pt117175A 49215/9G 3461
A566 B2ST 430 Cat2St 45.8/1T 442 b/FST B 410
210 Gr. C360617175--
A 566 Gr. C2St 440 Cat. 217 Mn 4--
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