This standard specifies the type, structure, size, marking and technical requirements for plate parts sag. This standard applies to materials such as aluminum alloy (2A12, 3A21, 5A02, 5A06, 5A90, 7A04, 2B06, 7B04, 2D12, 2D70), titanium alloy (TC1, TC2, TA1, TA15), magnesium alloy (MB8) and steel ( 0Cr17Ni5Mo3, 1Cr17Mn9Ni4N, 1Cr18Ni9, 1Cr18Ni9Ti, 30CrMnSiA) plate parts sink.