1.1 This specification covers six grades of zirconium ingots.1.2 The values stated in either inch-pound or SI units are to be regarded separately as standard. The values stated in each system are not exact equivalents; therefore, each system mus This specification covers the six grades of zirconium and zirconium alloy ingots: Grade R60700, Grade R60702, Grade R60703, Grade R60704, Grade R60705, and Grade R60706. These materials shall be manufactured by electron beam, vacuum, or inert atmospher