1.1This 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
Seamless and Welded Austenitic Stainless Steel Sanitary Tubing	A270
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
Welded Ferritic Stainless Steel Feedwater Heater Tubes	A803/A803M
Austenitic and Ferritic Stainless Steel Duct Tubes for Breeder Reactor Core Components	A826/A826M
High-Frequency Induction Welded, Unannealed Austenitic Steel Condenser Tubes	A851

(A)These designations refer to the latest issue of the respective specifications.

1.2In 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.

1.3The 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.