A 556 / A 556m Grade A2 Seamless Boiler Tubes Carbon Steel

A 556/A 556M Grade A2 Seamless Carbon Steel Boiler Tubes for Boiler Pipe

1.Standard Scope

1.1 This specifification2 covers minimum-wall-thickness,seamless cold-drawn carbon steel tubes

including bending into the form of U-tubes, if specifified,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.

2.Manufacture

(1)Manufactur-------Tubes shall be made by the seamless process and shall be cold drawn.

(2 )Heat Treatment:

2.2.1 Cold-drawn tubes shall be heat treated after the fifinal cold-draw pass at a temperature

of 1200°F[640°C] or higher to ensure ductility satisfactory for rolling into tube sheets and tomeet

mechanical properties as specifified.

2.2.2 If stress-relief anneal of the U-bends is specifified, the anneal shall consist of heating the bent

portion within a range of 1100 to 1200°F [585 to 640°C].

3.Chemical Requirement :

4.Tensile Requirements:

	Grade A2	Grade B2	Grade C2
Tensile strength,min,ksi(Mpa)	47(320)	60(410)	70(480)
Yield Strength,min,ksi(Mpa)	26(180)	37(260)	40(280)
Elongation in 2 in or 50min, min,%(longitudinal)	35	30	30

Product Tags:

precision seamless boiler tubes

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