ASTM A250/A250M-05
(Specification)Standard Specification for Electric-Resistance-Welded Ferritic Alloy-Steel Boiler and Superheater Tubes
Standard Specification for Electric-Resistance-Welded Ferritic Alloy-Steel Boiler and Superheater Tubes
ABSTRACT
This guide covers standard specification for 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. Product analysis shall be done wherein the material shall conform to the required chemical composition for carbon, manganese, phosphorus, sulfur, silicon, molybdenum, and chromium. The material shall conform to the required tensile properties, namely: tensile strength, yield strength, and elongation. The computed minimum elongation values for steel with decreasing wall thickness shall be given. The tubes shall have a hardness not exceeding the specified values for Brinell hardness and Rockwell hardness numbers. When the final heat treatment is in a continuous furnace, the number of tubes of the same size and from the same heat in a lot shall be determined from the given size of the tubes. Required mechanical tests such as tensile test, flattening test, flange test, reverse flattening test, hardness test, and hydrostatic or nondestructive electric tests, shall be performed on the steel specimen.
SCOPE
1.1 This specification 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.
1.2 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.
1.3 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.
1.4 An optional supplementary requirement is provided for non-destructive examination for certain ASME applications.
1.5 The values stated 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 stated 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.
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Contact ASTM International (www.astm.org) for the latest information.
Designation: A250/A250M – 05
Standard Specification for
Electric-Resistance-Welded Ferritic Alloy-Steel Boiler and
1
Superheater Tubes
This standard is issued under the fixed designationA250/A250M; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope* for Ferritic Alloy Steel, Austenitic Alloy Steel, and Stain-
2 less Steel Tubes
1.1 Thisspecification coversseveralgrades,designatedT1,
E213 Practice for Ultrasonic Testing of Metal Pipe and
T1a, T1b, T2, T11, T12 and T22, of minimum-wall-thickness,
Tubing
electric-resistance-welded, carbon-molybdenum and
E273 Practice for Ultrasonic Examination of theWeld Zone
chromium-molybdenum alloy-steel, boiler and superheater
of Welded Pipe and Tubing
tubes.
1.2 The tubing sizes and thicknesses usually furnished to
3. Ordering Information
1
this specification are ⁄2 to 5 in. [12.7 to 127 mm] in outside
3.1 Orders for material under this specification should
diameter and 0.035 to 0.320 in. [0.9 to 8.1 mm], inclusive, in
include the following, as required, to describe the desired
minimum wall thickness.Tubing having other dimensions may
material adequately:
be furnished, provided such tubes comply with all other
3.1.1 Quantity (feet, metres, or number of lengths),
requirements of this specification.
3.1.2 Name of material (electric-resistance-welded tubes),
1.3 Mechanical property requirements do not apply to
1 3.1.3 Grade (Table 1),
tubing smaller than ⁄8 in. [3.2 mm] in inside diameter or 0.015
3.1.4 Size (outside diameter or minimum wall thickness),
in. [0.4 mm] in thickness.
3.1.5 Length (specific or random),
1.4 An optional supplementary requirement is provided for
3.1.6 Optional requirement (7.3.6),
non-destructive examination for certain ASME applications.
3.1.7 Test report required (see Certification Section of
1.5 The values stated in either inch-pound units or SI units
Specification A1016/A1016M),
are to be regarded separately as the standard. Within the text,
3.1.8 Specification designation, and
the SI units are shown in brackets. The values stated in each
3.1.9 Special requirements and any supplementary require-
system are not exact equivalents; therefore, each system must
ments selected.
be used independently of the other. Combining values from the
two systems may result in nonconformance with the specifi-
4. General Requirements
cation. The inch-pound units shall apply unless the “M”
4.1 Product furnished under this specification shall conform
designation of this specification is specified in the order.
to the applicable requirements of Specification A1016/
A1016M, including any supplementary requirements that are
2. Referenced Documents
3 indicated in the purchase order. Failure to comply with the
2.1 ASTM Standards:
general requirements of Specification A1016/A1016M consti-
A1016/A1016M Specification for General Requirements
tutes nonconformance with this specification. In case of con-
flicts with the requirements of this specification and Specifi-
cation A1016/A1016M, this specification shall prevail.
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
5. Materials and Manufacture
A01.10 on Stainless and Alloy Steel Tubular Products.
Current edition approved March 1, 2005. Published March 2005. Originally
5.1 The steel shall be killed.
approved in 1941. Last previous edition approved in 2004 as A250/A250M – 04.
5.2 The tubes shall be made by electric-resistance welding.
DOI: 10.1520/A0250_A0250M-05.
2
5.3 Heat Treatment
For ASME Boiler and Pressure Vessel Code applications see related Specifi-
cation SA-250 in Section II of that Code.
5.3.1 After welding, or when cold finished, after the final
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
cold-drawing pass, all tubes shall be heat treated and, except as
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
provided in 5.3.2, furnished in the full annealed, isothermal
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. annealed, normalized, or normalized and tempered condition at
*ASummary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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A250/A250M – 05
TABLE 1 Chemical Requirements
Element Composition, %
Grade Grade Grade Grade Grade Grade Grade
T1 T1a T1b T2 T11 T12 T22
Carbon 0.10–0.20 0.15–0.25 0.14 max 0.10–0.20 0.05–0.15 0.05–0.1
...
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