1.1 This specification covers a group of requirements that, unless otherwise specified in an individual specification, shall apply to the ASTM product specifications noted below.

Title of Specification ASTM
Designation^A Seamless Carbon-Molybdenum Alloy-Steel Boiler and
Superheater Tubes A209/A209M Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater,
and Heat-Exchanger Tubes A213/A213M Welded Austenitic Steel Boiler, Superheater, Heat-Exchanger,
and Condenser Tubes A249/A249M Electric-Resistance-Welded Ferritic Alloy-Steel Boiler and
Superheater Tubes A250/A250M Seamless and Welded Ferritic and Martensitic Stainless Steel
Tubing for General Service A268/A268M Seamless and Welded Austenitic Stainless Steel Tubing for
General Service A269/A269M Seamless and Welded Austenitic and Ferritic/Austenitic
Stainless Steel Sanitary Tubing A270/A270M Seamless and Welded Carbon and Alloy-Steel Tubes for
Low-Temperature Service A334/A334M Welded Austenitic Stainless Steel Feedwater Heater Tubes A688/A688M Austenitic Stainless Steel Tubing for Breeder Reactor Core
Components A771/A771M Seamless and Welded Ferritic/Austenitic Stainless Steel Tubing
for General Service A789/A789M Seamless and Welded Ferritic Stainless Steel Feedwater Heater
Tubes A803/A803M Seamless Austenitic and Martensitic Stainless Steel Duct
Tubes for Liquid Metal-Cooled Reactor Core Components A826/A826M High-Frequency Induction Welded, Unannealed, Austenitic
Steel Condenser Tubes A851 Welded Austenitic Alloy Steel Boiler, Superheater, Condenser,
and Heat Exchanger Tubes with Textured Surface(s) A1098/A1098M

1.2 In the case of conflict between a requirement of a product specification and a requirement of this general requirements specification, the product specification shall prevail. In the case of conflict between a requirement of the product specification or a requirement of this general requirements specification and a more stringent requirement of the purchase order, the purchase order shall prevail.

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. The inch-pound units shall apply unless the "M" designation (SI) of the product specification is specified in the order.

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.