GB/T 222-2006 steel finished product chemical composition tolerance

GB/T 223.X series Steel and alloys Determination of X content

GB/T 4336—2002 Carbon steel and medium-low alloy steel spark source atomic emission spectrometry method (conventional method)

GB/T 4698.X series Chemical analysis methods for titanium, titanium and titanium alloys - Determination of X

GB/T 5121.X series - Methods for chemical analysis of copper and copper alloys - Part X: Determination of X content

GB/T 5678-1985 casting alloy spectral analysis sampling method

GBT 6987.X series Chemical analysis methods for aluminum and aluminum alloys......

GB/T 7999-2007 Aluminum and aluminum alloy photoelectric direct reading emission spectrum analysis method

GB/T 11170—2008 Determination of multi-element content of sparks by spark discharge atomic emission spectrometry (conventional method)

GB/T 11261—2006 Determination of oxygen content of pulsed heating inert gas fusion-infrared method

GB/T 13748.X series Chemical analysis methods for magnesium and magnesium alloys - Part X