Depends upon the application & whether codes (e.g., Boiler & Pressure Vessels) apply.
UNS S30400 is just a composition of a very common stainless steel.
ASME SA213, ASTM A213 & A511 are product specifications [SA indicates the ASME adaptation of an ASTM A specification].
A213 Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes contains performance test requirements, including flattening & flaring, not in A511.
A511-04 Standard Specification for Seamless Stainless Steel Mechanical Tubing includes some dimensional tolerance requirements (& even square tubing] not found in A213.