1、chemical composition test

1.according to the chemical composition and mechanical properties of domestic seamless pipe, such as 10, 15, 20, 25, 30, 35, 40, 45 and 50 steel chemical composition should comply with the provisions of GB/T699-88.Imported seamless pipes shall be inspected according to relevant standards stipulated in the contract.The chemical composition of 09MnV, 16Mn, 15MNV steel should comply with the provisions of GB1591-79.

2. Refer to gb223-84 “Methods for Chemical Analysis of Steel and Alloy” for specific analysis methods.

3. the analysis of deviation according to GB222-84 “steel chemical analysis with samples and finished product chemical composition deviation”.

2、physical performance test

1.according to the performance of the domestic seamless pipe supply, ordinary carbon steel according to GB/T700-88 class A steel manufacturing (but must ensure that the sulfur content does not exceed 0.050% and phosphorus content does not exceed 0.045%), its mechanical properties should meet the value specified in the GB8162-87 table.

2.according to the water pressure test supply of domestic seamless pipe must ensure the standard of water pressure test.

3. Physical performance inspection of imported seamless pipe shall be carried out according to relevant standards stipulated in the contract.