ASTM A423/A423M-95(2000)
(Specification)Standard Specification for Seamless and Electric-Welded Low-Alloy Steel Tubes
Standard Specification for Seamless and Electric-Welded Low-Alloy Steel Tubes
SCOPE
1.1 This specification covers minimum-wall-thickness, seamless and electric-resistance welded, low-alloy steel tubes for pressure containing parts such as economizers or other applications where corrosion resistance is important.
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 0.500 in. [0.9 to 12.7 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 1/4 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 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 423/A 423M – 95 (Reapproved 2000)
Standard Specification for
Seamless and Electric-Welded Low-Alloy Steel Tubes
This standard is issued under the fixed designation A 423/A 423M; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope 3. Ordering Information
1.1 This specification covers minimum-wall-thickness, 3.1 Orders for material under this specification shall include
seamless and electric-resistance welded, low-alloy steel tubes the following, as required, to describe the desired material
for pressure containing parts such as economizers or other adequately:
applications where corrosion resistance is important. 3.1.1 Quantity (feet, metres, or number of lengths),
1.2 The tubing sizes and thicknesses usually furnished to 3.1.2 Name of material (seamless or electric-resistance-
this specification are ⁄2 to 5 in. [12.7 to 127 mm] in outside welded tubes),
diameter and 0.035 to 0.500 in. [0.9 to 12.7 mm] inclusive, in 3.1.3 Grade (Table 1),
minimum wall thickness. Tubing having other dimensions may 3.1.4 Manufacture (hot finished or cold finished),
be furnished, provided such tubes comply with all other 3.1.5 Size (outside diameter and minimum wall thickness),
requirements of this specification. 3.1.6 Length (specific or random),
1.3 Mechanical property requirements do not apply to 3.1.7 Optional requirements (hydrostatic or electric test,
tubing smaller than ⁄4 in. [3.2 mm] in inside diameter or 0.015 13.7),
in. [0.4 mm] in thickness. 3.1.8 Test report required (see Certification Section of
1.4 An optional supplementary requirement is provided and, Specification A 450/A 450M),
when desired, shall be so stated in the order. 3.1.9 Specification designation, and
1.5 The values stated in either inch-pound units or SI units 3.1.10 Special requirements and any supplementary require-
are to be regarded separately as standard. Within the text, the ments selected.
SI units are shown in brackets. The values stated in each
4. Manufacture
system are not exact equivalents; therefore, each system must
be used independently of the other. Combining values from the 4.1 Tubes made by the seamless process may be hot finished
or cold finished.
two systems may result in nonconformance with the specifi-
cation. The inch-pound units shall apply unless the “M”
5. Heat Treatment
designation of this specification is specified in the order.
5.1 All tubes shall be normalized or given such heat
2. Referenced Documents
treatment as may be necessary to conform to the requirements
of this specification.
2.1 ASTM Standards:
E 213 Practice for Ultrasonic Examination of Metal Pipe
3 6. Chemical Composition
and Tubing
6.1 The steel shall conform to the requirements as to
E 273 Practice for Ultrasonic Examination of Longitudinal
chemical composition prescribed in Table 1.
Welded Pipe and Tubing
A 450/A 450M Specification for General Requirements for
7. Product Analysis
Carbon, Ferritic Alloy, and Austenitic Alloy Steel Tubes
7.1 An analysis of either one billet, one length of flat-rolled
stock or one tube shall be made from each heat. The chemical
composition thus determined shall conform to the requirements
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
specified.
Stainless Steel, and Related Alloys, and is the direct responsibility of Subcommittee
7.2 If the original test for product analysis fails, retests of
A01.09 on Carbon Steel Tubular Products.
Current edition approved Sept. 10, 1995. Published March 1996. Originally
two additional billets, lengths of flat-rolled stock, or tubes shall
published as A 423 – 58 T. Last previous edition A 423/A 423M–91.
be made. Both retests, for the elements in question shall meet
For ASME Boiler and Pressure Vessel Code applications see related Specifi-
the requirements of the specification; otherwise all remaining
cation SA-423 in Section II of that Code.
Annual Book of ASTM Standards, Vol 03.03. material in the heat or lot (Note 1) shall be rejected or, at the
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A 423/A 423M – 95 (2000)
TABLE 1 Chemical Requirements TABLE 3 Tensile Requirements
Tensile strength, min, ksi [MPa], 60 [415]
Composition, %
Yield strength, min, or 50 mm, 37 [255]
ksi [MPa]
Grade 1 Grade 2
Elongation in 2 in. or 50 mm, min, % 25
A
Carbon, max 0.15 0.15
For longitudinal strip tests a deduction for each 1.25
Manganese, max 0.55 0.50–1.00 1
⁄32 in. [0.8 mm] decrease in wall thickness
Phosphorus 0.06–0.16 0.04 max 5
below ⁄16 in. [8 mm] from the basic minimum
Sulfur, max 0.060 0.05
elongation of the following percentage points
Silicon, min 0.10 .
shall be made
Copper 0.20–0.60 0.30–1.00
A
Calculated elongation requirements shall be rounded to the nearest whole
Chromium 0.24–1.31 .
number.
Nickel 0.20–0.70 0.40–1.10
Molybdenum, min . 0.10
10. Forming Operations
10.1 Tubes when inserted in the boiler shall stand expanding
option of the producer, each billet, length of flat-rolled stock or and beading without showing cracks or flaws.
tube may be individually tested for acceptance. Billets, lengths
11. Mechanical Tests Required
of flat-rolled stock or tubes which do not meet the requirements
11.1 Tension Test—One tension test shall be made on a
of the specification shall be rejected.
specimen for lots of not more than 50 tubes. Tension tests shall
NOTE 1—For flattening, flaring, and flange requirements, the term lot
be made on specimens from two tubes for lots of more than 50
applies to all tubes prior to cutting of the same nominal size and wall
tubes (Note 2).
thickness that are pr
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