ASTM A688/A688M-24

Standard Specification for Seamless and Welded Austenitic Stainless Steel Feedwater Heater Tubes

ABSTRACT
This specification covers standard requirements for welded austenitic stainless steel feedforward heater tubes including those bent, if specified, into the form of U-tubes for application in tubular feed-water heaters. All finished straight tubing or straight tubing ready for U-bending shall be furnished in the solution-annealed condition. The steel shall conform to the required chemical composition for carbon, phosphorus, chromium, molybdenum, nitrogen, and copper. The material shall also conform to tensile properties such as tensile strength, yield strength, and elongation. The steel shall undergo mechanical tests such as tension test, hardness test, reverse bend test, flattening test, flange test, pressure test, hydrostatic test, and air underwater test. Nondestructive test (electric test) shall be performed and corrosion resisting properties shall be determined for each sample tube.
SCOPE
1.1 This specification2 covers seamless and 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 SI units or inch-pound units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. 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.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 29-Feb-2024
• ICS: 23.040.10 - Iron and steel pipes
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.10 - Stainless and Alloy Steel Tubular Products

Relations

• Replaces: ASTM A688/A688M-18(2022) - Standard Specification for Seamless and Welded Austenitic Stainless Steel Feedwater Heater Tubes
• Effective Date: 01-Mar-2024
• Referred By: ASTM A1016/A1016M-23 - Standard Specification for General Requirements for Ferritic Alloy Steel, Austenitic Alloy Steel, and Stainless Steel Tubes
• Effective Date: 01-Mar-2024
• Referred By: ASTM A1012-10(2021) - Standard Specification for Seamless and Welded Ferritic, Austenitic and Duplex Alloy Steel Condenser and Heat Exchanger Tubes With Integral Fins
• Effective Date: 01-Mar-2024

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: A688/A688M − 24
Standard Specification for
Seamless and Welded Austenitic Stainless Steel Feedwater
1
Heater Tubes
This standard is issued under the fixed designation A688/A688M; 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* Alloys, and Ferroalloys
2 A1016/A1016M Specification for General Requirements for
1.1 This specification covers seamless and welded auste-
Ferritic Alloy Steel, Austenitic Alloy Steel, and Stainless
nitic stainless steel feedwater heater tubes including those bent,
Steel Tubes
if specified, into the form of U-tubes for application in tubular
E112 Test Methods for Determining Average Grain Size
feed-water heaters.
E527 Practice for Numbering Metals and Alloys in the
5
1.2 The tubing sizes covered shall be ⁄8 to 1 in. [15.9 to
Unified Numbering System (UNS)
25.4 mm] inclusive outside diameter, and average or minimum
2.2 Other Standard:
wall thicknesses of 0.028 in. [0.7 mm] and heavier.
SAE J1086 Practice for Numbering Metals and Alloys
4
1.3 The values stated in either SI units or inch-pound units
(UNS)
are to be regarded separately as standard. Within the text, the
SI units are shown in brackets. The values stated in each
3. Terminology
system may not be exact equivalents; therefore, each system
3.1 Definitions Of Terms—For definitions of terms used in
shall be used independently of the other. Combining values
this specification, refer to Terminology A941.
from the two systems may result in non-conformance with the
standard.
4. Ordering Information
1.4 This international standard was developed in accor-
dance with internationally recognized principles on standard-
4.1 It is the responsibility of the purchaser to specify all
ization established in the Decision on Principles for the
requirements that are necessary for material under this speci-
Development of International Standards, Guides and Recom-
fication. Such requirements may include, but are not limited to,
mendations issued by the World Trade Organization Technical
the following:
Barriers to Trade (TBT) Committee.
4.1.1 Quantity (length or number of pieces),
4.1.2 Material description (seamless or welded),
2. Referenced Documents
4.1.3 Dimensions—Outside diameter, wall thickness (mini-
3
2.1 ASTM Standards:
mum or average wall), and length,
A262 Practices for Detecting Susceptibility to Intergranular
4.1.4 Grade (chemical composition) (Table 1),
Attack in Austenitic Stainless Steels
4.1.5 U-bend requirements, if order specifies bending,
A480/A480M Specification for General Requirements for
U-bend schedules or drawings shall accompany the order,
Flat-Rolled Stainless and Heat-Resisting Steel Plate,
4.1.6 Optional requirements—Purchaser shall specify if an-
Sheet, and Strip
nealing of the U-bends is required or whether tubes are to be
A941 Terminology Relating to Steel, Stainless Steel, Related
hydrotested or air tested (see 11.8)
4.1.7 Supplementary requirements—Purchaser shall
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
specify on the purchase order if material is to be eddy current
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
tested in accordance with Supplementary Requirements S1 or
A01.10 on Stainless and Alloy Steel Tubular Products.
S2, and if special test reports are required under Supplementary
Current edition approved March 1, 2024. Published April 2024. Originally
approved in 1973. Last previous edition approved in 2022 as A688/A688M – 18
Requirement S3, and,
(2022). DOI: 10.1520/A0688_A0688M-24.
4.1.8 Any additional special requirements.
2
For ASME Boiler and Pressure Vessel Code applications see related Specifi-
cation SA-688 in Section II of that Code.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
4
Standards volume information, refer to the standard’s Document Summary page on Available from Society of Automotive Engineers (SAE), 400 Commonwealth
the ASTM website. Dr., Warrendale, PA 15096-0001, http://www.sae.org.
*A Summary 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
1

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A688/A688M − 24
2
TABLE 1 Chemical Requirements
Grade. TP 304 TP 304L . . . TP 304LN TP 316 TP 316L TP 31
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: A688/A688M − 18 (Reapproved 2022) A688/A688M − 24
Standard Specification for
Seamless and Welded Austenitic Stainless Steel Feedwater
1
Heater Tubes
This standard is issued under the fixed designation A688/A688M; 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 Scope*
2
1.1 This specification covers seamless and 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.
5
1.2 The tubing sizes covered shall be ⁄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 SI units or inch-pound units are to be regarded separately as standard. Within the text, the SI units
are shown in brackets. 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.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
3
2.1 ASTM Standards:
A262 Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels
A480/A480M Specification for General Requirements for Flat-Rolled Stainless and Heat-Resisting Steel Plate, Sheet, and Strip
A941 Terminology Relating to Steel, Stainless Steel, Related Alloys, and Ferroalloys
A1016/A1016M Specification for General Requirements for Ferritic Alloy Steel, Austenitic Alloy Steel, and Stainless Steel
Tubes
E112 Test Methods for Determining Average Grain Size
E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)
2.2 Other Standard:
4
SAE J1086 Practice for Numbering Metals and Alloys (UNS)
3. Terminology
3.1 Definitions Of Terms—For definitions of terms used in this specification, refer to Terminology A941.
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 A01.10
on Stainless and Alloy Steel Tubular Products.
Current edition approved Sept. 1, 2022March 1, 2024. Published October 2022April 2024. Originally approved in 1973. Last previous edition approved in 20182022 as
A688/A688M – 18.A688/A688M – 18 (2022). DOI: 10.1520/A0688_A0688M-18R22.10.1520/A0688_A0688M-24.
2
For ASME Boiler and Pressure Vessel Code applications see related Specification SA-688 in Section II of that Code.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
4
Available from Society of Automotive Engineers (SAE), 400 Commonwealth Dr., Warrendale, PA 15096-0001, http://www.sae.org.
*A Summary 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
1

---------------------- Page: 1 ----------------------
A688/A688M − 24
4. Ordering Information
4.1 It is the responsibility of the purchaser to specify all requirements that are necessary for material under this specification. Such
requirements may include, but are not limited to, the following:
4.1.1 Quantity (length or number of pieces),
4.1.2 Material description (seamless or welded),
4.1.3 Dimensions—Outside diameter, wall thickness (minimum or average wall), and length,
4.1.4 Grade (chemical composition) (Table 1),
4.1.5 U-bend requirements, if order specifies bending, U-bend schedules or drawings shall accompany the order,
4.1.6 Optional requirements—Purchaser shall specify if annealing of the U-bends is required or whether tubes are to be
hydrotested or air tested (see 11.8)
4.1.7 Supplementary requirements—Purchaser shall specify on the purchase order if material is to be eddy current tested in
accordance with Supplementary Requirements S1 or S2, and if spe
...