ASTM A250/A250M-95(2001)
(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
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 and, when desired, shall be so stated in the order.
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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Designation: A 250/A 250M – 95 (Reapproved 2001)
Standard Specification for
Electric-Resistance-Welded Ferritic Alloy-Steel Boiler and
Superheater Tubes
This standard is issued under the fixed designation A 250/A 250M; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope E 273 Practice for Ultrasonic Examination of Longitudinal
2 Welded Pipe and Tubing
1.1 This specification covers several grades, designated T1,
T1a, T1b, T2, T11, T12 and T22, of minimum-wall-thickness,
3. Ordering Information
electric-resistance-welded, carbon-molybdenum and
3.1 Orders for material under this specification should
chromium-molybdenum alloy-steel, boiler and superheater
include the following, as required, to describe the desired
tubes.
material adequately:
1.2 The tubing sizes and thicknesses usually furnished to
3.1.1 Quantity (feet, metres, or number of lengths),
this specification are ⁄2 to 5 in. [12.7 to 127 mm] in outside
3.1.2 Name of material (electric-resistance-welded tubes),
diameter and 0.035 to 0.320 in. [0.9 to 8.1 mm], inclusive, in
3.1.3 Grade (Table 1),
minimum wall thickness. Tubing having other dimensions may
3.1.4 Size (outside diameter or minimum wall thickness),
be furnished, provided such tubes comply with all other
3.1.5 Length (specific or random),
requirements of this specification.
3.1.6 Optional requirement (11.6),
1.3 Mechanical property requirements do not apply to
1 3.1.7 Test report required (see Certification Section of
tubing smaller than ⁄8 in. [3.2 mm] in inside diameter or 0.015
Specification A 450/A 450M),
in. [0.4 mm] in thickness.
3.1.8 Specification designation, and
1.4 An optional supplementary requirement is provided and,
3.1.9 Special requirements and any supplementary require-
when desired, shall be so stated in the order.
ments selected.
1.5 The values stated in either inch-pound units or SI units
are to be regarded separately as the standard. Within the text,
4. General Requirements
the SI units are shown in brackets. The values stated in each
4.1 Material furnished under this specification shall con-
system are not exact equivalents; therefore, each system must
form to the applicable requirements of the current edition of
be used independently of the other. Combining values from the
Specification A 450/A 450M, unless otherwise provided
two systems may result in nonconformance with the specifi-
herein.
cation. The inch-pound units shall apply unless the “M”
designation of this specification is specified in the order.
5. Manufacture
5.1 The steel shall be killed.
2. Referenced Documents
5.2 The tubes shall be made by electric-resistance welding.
2.1 ASTM Standards:
A 450/A 450M Specification for General Requirements for
6. Heat Treatment
Carbon, Ferritic Alloy, and Austenitic Alloy Steel Tubes
6.1 After welding, or when cold finished, after the final
E 213 Practice for Ultrasonic Examination of Metal Pipe
4 cold-drawing pass, all tubes shall be heat treated and, except as
and Tubing
provided in 6.1.1, furnished in the full annealed, isothermal
annealed, normalized, or normalized and tempered condition at
the option of the manufacturer. If furnished in the normalized
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
Stainless Steel, and Related Alloys, and is the direct responsibility of Subcommittee
and tempered condition, the minimum tempering temperature
A01.10 on Stainless and Alloy Steel Tubular Products.
shall be 1200°F [650°C], except T22 shall be tempered at
Current edition approved Sept. 10, 1995. Published December 1995. Originally
1250°F [676°C] minimum.
published as A 250 – 41 T. Last previous edition A 250/A 250M – 91.
For ASME Boiler and Pressure Vessel Code applications see related Specifi- 6.1.1 When grades T1, T1a, T1b, and T2 are cold finished,
cation SA-250 in Section II of that Code.
the tubes may, at the option of the manufacturer, be heat treated
Annual Book of ASTM Standards, Vol 01.01.
after the final cold-drawing pass at a temperature of 1200°F or
Annual Book of ASTM Standards, Vol 03.03.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
A 250/A 250M – 95 (2001)
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 0.05–0.15 0.15 max
Manganese 0.30–0.80 0.30–0.80 0.30–0.80 0.30–0.61 0.30–0.60 0.30–0.61 0.30–0.60
Phosphorus, max 0.025 0.025 0.025 0.025 0.025 0.030 0.025
Sulfur, max 0.025 0.025 0.025 0.020 0.020 0.020 0.020
Silicon 0.10–0.50 0.10–0.50 0.10–0.50 0.10–0.30 0.50–1.00 0.50 max 0.50 max
Molybdenum 0.44–0.65 0.44–0.65 0.44–0.65 0.44–0.65 0.44–0.65 0.44–0.65 0.87–1.13
Chromium . . . . . . . . . 0.50–0.81 1.00–1.50 0.80–1.25 1.90–2.60
higher, provided one of the heat treatments specified in 6.1 was 9. Tensile Requirements
applied after welding.
9.1 The material shall conform to the requirements as to
tensile properties prescribed in Table 3.
7. Chemical Composition
9.2 Table 4 gives the computed minimum elongation values
7.1 The steel shall conform to the requirements as to
for each ⁄32-in. [0.8 mm] decrease in wall thickness. Where the
chemical composition prescribed in Table 1.
wall thickness lies between two values shown above, the
minimum elongation value shall be determined by the follow-
8. Product Analysis
ing equation:
8.1 An analysis of either one length of flat-rolled stock or
E 5 48t 1 15.00 @E 5 1.87t 1 15.00#
one tube shall be made on each heat. The chemical composition
where:
thus determined shall conform to the requirements specified.
E = elongation in 2 in. or 50 mm %, and
8.2 If the original test for product analysis fails, retests of
t = actual thickness of specimen, in.[mm].
two additional lengths of flat-rolled stock or tubes shall be
made. Both retests for the elements in question shall meet the
10. Hardness Requirements
requirements of the specification; otherwise all remaining
10.1 The tubes shall have a hardness not exceeding the
material in the heat or lot (Note 1) shall be rejected or, at the
requirements of Table 5.
option of the producer, each length of flat-rolled stock or tube
may be individually tested for acceptance. Lengths of flat-
11. Mechanical Tests Required
rolled stock or tubes which do not meet the requirements of the
specification shall be rejected.
11.1 Tension Test—One tension test shall be made on a
specimen for lots of not more than 50 tubes. Tension tests shall
NOTE 1—For flattening an
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