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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 SpecificationASTM DesignationSeamless Carbon-Molybdenum Alloy-Steel Boiler and Superheater Tubes A 209/A 209MSeamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger TubesA 213/A 213MWelded Austenitic Steel Boiler, Superheater, Heat-Exchanger, and Condenser TubesA 249/A 249MElectric-Resistance-Welded Ferritic Alloy-Steel Boiler and Superheater TubesA 250/A 250MSeamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General ServiceA 268/A 268MSeamless and Welded Austenitic Stainless Steel Tubing for General Service A 269Seamless and Welded Austenitic Stainless Steel Sanitary TubingA 270Seamless and Welded Carbon and Alloy-Steel Tubes for Low-Temperature Service A 334/A 334MSeamless and Electric-Welded Low-Alloy Steel TubesA 423/A 423MWelded Austenitic Stainless Steel Feedwater Heater TubesA 688/A 688MAustenitic Stainless Steel Tubing for Breeder Reactor Core Components A 771Seamless and Welded Ferritic/Austenitic Stainless Steel Tubing for General ServiceA 789/A 789MWelded Ferritic Stainless Steel Feedwater Heater TubesA 803/A 803MAustenitic and Ferritic Stainless Steel Duct Tubes for Breeder Reactor Core ComponentsA 826High-Frequency Induction Welded, Unannealed Austenitic Steel Condenser Tubes A 851 These designations refer to the latest issue of the respective specifications.

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 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 (SI) of the product specification is specified in the order.