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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
Wall Thickness, %
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
Over Under Over Under Over Under Over Under
Seamless, Hot-Finished Tubes
4 [101.6] and under 40 0 35 0 33 0 28 0
Over 4 ... .... …. 35 0 33 0 28 0
[101.6]
Seamless, Cold-Finished Tubes
Over Under
11⁄2 [38.1] and under 20 0
Over 11⁄2 [38.1] 22 0
Welded Tubes
All sizes 18 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
Hot-Finished Seamless Tubes
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]
Welded Tubes and Cold-Finished Seamless Tubes
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]
Over 71⁄2 to 9 [190.5 to 228.6], incl 0.015 [0.38] 0.045 [1.14]
5, Hydrostatic Test Pressures
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]
5 [127] and over 4500 [31]
6, Straightness Tolerances
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.
Over 8.0 to 12.75, incl. Over 4 % OD to1.0, incl 0.060 0.020 3 length, ft.
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