ASTM A688/A688M-01
(Specification)Standard Specification for Welded Austenitic Stainless Steel Feedwater Heater Tubes
Standard Specification for Welded Austenitic Stainless Steel Feedwater Heater Tubes
SCOPE
1.1 This specification covers welded austenitic stainless steel feedwater heater tubes including those bent, if specified, into the form of U-tubes for application in tubular feed-water heaters.
1.2 The tubing sizes covered shall be 5/8 to 1 in. [15.9 to 25.4 mm] inclusive outside diameter, and average or minimum wall thicknesses of 0.028 in. [0.7 mm] and heavier.
1.3 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 shall be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.
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An American National Standard
Designation: A 688/A 688M – 01
Standard Specification for
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Welded Austenitic Stainless Steel Feedwater Heater Tubes
This standard is issued under the fixed designation A 688/A 688M; 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 this specification, refer to Terminology A 941.
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1.1 This specification covers welded austenitic stainless
4. Ordering Information
steel feedwater heater tubes including those bent, if specified,
4.1 Orders for material to this specification should include
into the form of U-tubes for application in tubular feed-water
the following as required to adequately describe the desired
heaters.
material:
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1.2 The tubing sizes covered shall be ⁄8 to 1 in. [15.9 to
4.1.1 Quantity (length or number of pieces),
25.4 mm] inclusive outside diameter, and average or minimum
4.1.2 Material description,
wall thicknesses of 0.028 in. [0.7 mm] and heavier.
4.1.3 Dimensions—Outside diameter, wall thickness (mini-
1.3 The values stated in either inch-pound units or SI units
mum or average wall), and length,
are to be regarded separately as standard. Within the text, the
4.1.4 Grade (chemical composition) (Table 1),
SI units are shown in brackets. The values stated in each
4.1.5 U-bend requirements, if order specifies bending,
system are not exact equivalents; therefore, each system shall
U-bend schedules or drawings shall accompany the order,
be used independently of the other. Combining values from the
4.1.6 Optional requirements—Purchaser shall specify if an-
two systems may result in nonconformance with the specifi-
nealing of the U-bends is required or whether tubes are to be
cation.
hydrotested or air tested (see 11.6)
2. Referenced Documents 4.1.7 Supplementary requirements—Purchaser shall
specify on the purchase order if material is to be eddy current
2.1 ASTM Standards:
tested in accordance with Supplementary Requirements S1 or
A 262 Practices for Detecting Susceptibility to Intergranu-
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S2, and if special test reports are required under Supplementary
lar Attack in Austenitic Stainless Steels
Requirement S3.
A 450/A 450M Specification for General Requirements for
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Carbon, Ferritic Alloy, and Austenitic Alloy Steel Tubes
5. General Requirements
A 480/A 480M Specification for General Requirements for
5.1 Material furnished to this specification shall conform to
Flat-Rolled Stainless and Heat-Resisting Steel Plate,
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the applicable requirements of the latest published edition of
Sheet, and Strip
Specification A 450/A 450M unless otherwise provided herein.
A 941 Terminology Relating to Steel, Stainless Steel, Re-
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lated Alloys, and Ferroalloys
6. Materials and Manufacture
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E 527 Practice for Numbering Metals and Alloys (UNS)
6.1 The tube shall be made from flat-rolled steel by an
2.2 Other Standard:
automatic welding process with no addition of filler metal.
SAE J1086 Practice for Numbering Metals and Alloys
5 6.2 Subsequent to welding and prior to final heat treatment,
(UNS)
the tubes shall be cold worked either in both the weld and base
3. Terminology metal, or in the weld metal only. The method of cold work may
be specified by the purchaser. When cold drawn, the purchaser
3.1 Definitions Of Terms—For definitions of terms used in
may specify the minimum amount of reduction in cross-
sectional area or wall thickness, or both.
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This specification is under the jurisdiction of ASTM Committee A01 on Steel,
6.3 Many surface contaminants may have detrimental ef-
Stainless Steel, and Related Alloys and is the direct responsibility of Subcommittee
fects on high temperature properties or corrosion resistance of
A01.10 on Stainless and Alloy Steel Tubular Products.
tubing. Contamination by copper, lead, mercury, zinc, chlo-
Current edition approved Mar. 10, 2001. Published May 2001. Originally
rides, or sulfur may be detrimental to stainless steels. The
published as A 688 – 73. Last previous edition A 688M – 00.
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For ASME Boiler and Pressure Vessel Code applications see related Specifi-
manufacturer shall employ techniques that minimize surface
cation SA-688 in Section II of that Code.
contamination by these elements.
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Annual Book of ASTM Standards, Vol 01.03.
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Annual Book of ASTM Standards, Vol 01.01.
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Available from Society of Automotive Engineers, 400 Commonwealth Drive,
Warrendale, PA 15096.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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A 688/A 688M
TABLE 1 Chemical Requirements
Grade. TP 304 TP 304L TP 304LN TP 316 T
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