*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 223.12-1991 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 223.19-1989 Methods for chemical analysis of iron, steel and alloy. The neocuproine-chloroform extraction photometric method for the determination of copper content
*GB/T 223.23-1994 Methods for chemical analysis of iron, steel and alloy.The dimethylglyoxime spectrophotometric method for the determination of nickel content
*GB/T 223.63-1988 Methods for chemical analysis of iron, steel and alloy - The sodium (potassium) periodate photometric 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 228-1987
*GB/T 242-1997 Metallic materials—Tube—Drift expanding test
*GB/T 244-1997 Metallic materials--Tube--Bend test
*GB/T 245-1997 Metallic materials--Tube--Flanging test
*GB/T 246-1997 Metallic materials--Tube--Flattening test
*GB/T 699-1999 Quality carbon structural steels
*GB/T 5777-1996 Seamless steel pipe and tubing-Methods for ultrsonic testing
*GB/T 7735-1995 Steel tubes--The inspection method on eddy current test
*GB/T 12606-1999 Steel tubes--The testing method of magnetic flux leakage
*GB/T 17395-1998 Dimensions,shapes,masses and tolerances of seamless steel tubes
*YB/T 5222-1993 Quality Carbon Steel seamless tube blank

*GB 3087-1999 Seamless steel tubes for low and medium pressure
*GB 3087-1999 Seamless steel tubes for low and medium pressure