*GB/T 223.5-1997 Methods for chemical analysis of iron,steel and alloy The reduced molybdosilicate spectrophotometric method for the determination of acid-soluble silicon content
*GB/T 223.11-1991 Methods for chemical analysis of iron,steel and alloy The ammonium persulfate oxidation volumetric method for the determination of chromium content
*GB/T 223.12-1991 Methods for chemical analysis of iron, steel and alloy The sodium carbonate separation-diphenyl carbazide photometric method for the determination of chromium content
*GB/T 223.16-1991 Methods for chemical analysis of iron, steel and alloy The chromotropic acid photometric method for the determination of titanium content
*GB/T 223.26-1989 Methods for chemical analysis of iron, steel and alloy--The thiocyanate direct photometric method for the determination of molybdenum content
*GB/T 223.54-1987 Methods for chemical analysis of iron, steel and alloy - The flame atomic absorption spectrophotometric method for the determination of nickel content
*GB/T 223.60-1997 Methods for chemical analysis of iron,steel and alloy The perchloric acid dehydration gravimetric method for the determination of silicon content
*GB/T 223.64-1988 Methods for chemical analysis of iron, steel and alloy; The flame atomic absorption spectrometric method for the determination of manganese content
*GB/T 223.69-1997 Methods for chemical analysis of iron,steel and alloy The gas- volumetric method after combustion in the pipe furnace for the determination of carbon content
*GB/T 223.72-1991 Methods for chemical analysis of iron, steel and alloy The alumina chromatographic separation-barium sulfate gravimetric method for the determination of sulphur content
*GB/T 223.75-1991 Methods for chemical analysis of iron, steel and alloy The methanol distillation-curcumin photometric method for the determination of boron content
*GB/T 228-1987
*GB/T 229-1994 Metallic materials-Charpy notch impact test
*GB/T 231-1984 Metallic materials--Brinell hardness test
*GB/T 242-1997 Metallic materials—Tube—Drift expanding test
*GB/T 244-1997 Metallic materials--Tube--Bend test
*GB/T 246-1997 Metallic materials--Tube--Flattening test
*GB/T 699-1999 Quality carbon structural steels
*GB/T 1591-1994 High strength low alloy structural steels
*GB/T 3077-1999 Alloy structure steels
*GB/T 5777-1996 Seamless steel pipe and tubing-Methods for ultrsonic testing
*GB/T 17395-1998 Dimensions,shapes,masses and tolerances of seamless steel tubes
*YB/T 5221-1993 Alloy structure steel blank for making seamless tube
*YB/T 5222-1993 Quality Carbon Steel seamless tube blank

*GB/T 8162-1999 Seamless steel tubes for structural purposes
*GB/T 8162-1999 Seamless steel tubes for structural purposes
*GB/T 8162-1999 Seamless steel tubes for structural purposes
*GB/T 8162-1999 Seamless steel tubes for structural purposes