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ASTM A688/A688M-18(2022)

Historical Reaffirmation

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

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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.


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.


SDO ASTM: ASTM International
Document Number A688
Publication Date Sept. 1, 2022
Language en - English
Page Count 8
Revision Level 18(2022)
Supercedes
Committee A01.10
Publish Date Document Id Type View
March 1, 2024 A0688_A0688M-24 Revision
Sept. 1, 2018 A0688_A0688M-18 Revision
March 1, 2015 A0688_A0688M-15 Revision
March 1, 2012 A0688_A0688M-12 Revision
April 1, 2011 A0688_A0688M-11 Revision
May 1, 2010 A0688_A0688M-10 Revision
March 1, 2008 A0688_A0688M-08 Revision
Nov. 1, 2007 A0688_A0688M-07 Revision
Sept. 1, 2004 A0688_A0688M-04 Revision
Sept. 10, 2003 A0688_A0688M-03 Revision
July 10, 2002 A0688_A0688M-02 Revision
Sept. 10, 2001 A0688_A0688M-01 Revision
Sept. 10, 2001 A0688_A0688M-00 Revision
Sept. 1, 2022 A0688_A0688M-18R22 Reaffirmation