A210Standard Specification for Seamless Medium-Carbon Steel Boiler and SuperheaterTubes1

1, Chemical composition:

                                     A-1          C       

Carbon Max                0.27       0.35 

Manganese                0.93Max    0.29-1.06 

Phosphorus, max       0.035      0.035  

Sulfur, max                0.035      0.035 

Silicon                       0.10Min   0.10 Min 

2,  Mechanical Properties:

For Grade A-1

Tensile strength, min, ksi [MPa]           60[415]

Yield Strength, min, ksi [MPa]              37 [255]

Elongation in 2 in. or 50 mm, min,        %30

For Grade C

Tensile strength, min, ksi [MPa]           70 [485]

Yield Strength, min, ksi [MPa]              40[275]

Elongation in 2 in. or 50 mm, min,         %30

3, Permissible Variations in Wall Thickness A

Outside Diameter, in. [mm]   0.095[2.4]          Over0.095to    ,               Over 0.150to      ,        Over0.180,     

                                            and under        0.150[2.4 to3.8] incl      0.180[3.8 to4.6] incl           4.6incl

4 [101.6] and under              40      0                  35       0                     33       0                28       0

Over 4 ...                             ....      ….              35       0                     33       0                28       0

[101.6]

11⁄2 [38.1] and under                                       20               0

A, These permissible variations in wall thickness apply only to tubes, except internal-upset tubes, as rolled or cold-finished, and before swaging, expanding, bending, polishing, or other fabricating operations.

4, Permissible Variations in Outside Diameter A

Outside Diameter, in. [mm]                               Permissible Variations, in. [mm]

Over                Under

4 [101.6] and under                                               1⁄64 [0.4]            1⁄32 [0.8]

Over 4 to 71⁄2 [101.6 to 190.5], incl                      1⁄64 [0.4]            3⁄64 [1.2]

Over 71⁄2 to 9 [190.5 to 228.6], incl                      1⁄64 [0.4]            1⁄16 [1.6]

Under 1 [25.4]                                                   0.004 [0.1]            0.004 [0.1]

1 to 11⁄2 [25.4 to 38.1], incl                                0.006 [0.15]           0.006 [0.15]

Over 11⁄2 to 2 [38.1 to 50.8], excl                       0.008 [0.2]            0.008 [0.2]

2 to 21⁄2 [50.8 to 63.5], excl                               0.010 [0.25]           0.010 [0.25]

21⁄2 to 3 [63.5 to 76.2], excl                               0.012 [0.3]            0.012 [0.3]

3 to 4 [76.2 to 101.6], incl                                  0.015 [0.38]           0.015 [0.38]

Over 4 to 71⁄2 [101.6 to 190.5], incl                    0.015 [0.38]           0.025 [0.64]

Outside Diameter of Tube, in. [mm]                                 Hydrostatic Test Pressure, psi [MPa]

Under 1 [25.4]                                                                 1000 [7]

1 to 11⁄2 [25.4 to 38.1], excl                                             1500 [10]

11⁄2 to 2 [38.1 to 50.8], excl                                             2000 [14]

2 to 3 [50.8 to 76.2], excl                                                 2500 [17]

3 to 5 [76.2 to 127], excl                                                  3500 [24]

Specified OD (in.)        Specified Wall            Maximum Curvature          Maximum Curvature

Thickness (in.)             in Any 3ft (in.)              in Total Length (in.)

Up to 5.0, incl         Over 3 % OD to 0.5, incl              0.030                    0.010 3 lengths, ft.

Over 5.0 to 8.0, incl.    Over 4 % OD to0.75, incl         0.045                    0.015 3 length, ft.