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ASTM A250/A250M
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ASTM A250/A250M 2005 Edition, March 1, 2005 Standard Specification for Electric-Resistance-Welded Ferritic Alloy-Steel Boiler and Superheater Tubes
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Description / Abstract:
This specification2 covers several grades, designated
T1, T1a, T1b, T2, T11, T12 and T22, of minimum-wall-thickness,
electric-resistance-welded, carbon-molybdenum and
chromium-molybdenum alloy-steel, boiler and superheater
tubes.
The tubing sizes and thicknesses usually furnished to this specification are 1⁄2 to 5 in. [12.7 to 127 mm] in outside diameter and 0.035 to 0.320 in. [0.9 to 8.1 mm], inclusive, in minimum wall thickness. Tubing having other dimensions may be furnished, provided such tubes comply with all other requirements of this specification.
Mechanical property requirements do not apply to tubing smaller than 1⁄8 in. [3.2 mm] in inside diameter or 0.015 in. [0.4 mm] in thickness.
An optional supplementary requirement is provided for non-destructive examination for certain ASME applications.
The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
Within the text, the SI units are shown in brackets.
The inch-pound units shall apply unless the "M" designation of this specification is specified in the order.
2 For ASME Boiler and Pressure Vessel Code applications see related Specification SA-250 in Section II of that Code.
The tubing sizes and thicknesses usually furnished to this specification are 1⁄2 to 5 in. [12.7 to 127 mm] in outside diameter and 0.035 to 0.320 in. [0.9 to 8.1 mm], inclusive, in minimum wall thickness. Tubing having other dimensions may be furnished, provided such tubes comply with all other requirements of this specification.
Mechanical property requirements do not apply to tubing smaller than 1⁄8 in. [3.2 mm] in inside diameter or 0.015 in. [0.4 mm] in thickness.
An optional supplementary requirement is provided for non-destructive examination for certain ASME applications.
The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
Within the text, the SI units are shown in brackets.
The inch-pound units shall apply unless the "M" designation of this specification is specified in the order.
2 For ASME Boiler and Pressure Vessel Code applications see related Specification SA-250 in Section II of that Code.