Seamless tube composition

2.1. The chemical composition of domestic seamless pipes supplied according to their chemical composition and mechanical properties, such as steel grades 10, 15, 20, 25, 30, 35, 40, 45, and 50, shall comply with the provisions of GB/T699-88. Imported seamless pipes shall be inspected according to the relevant standards specified in the contract. The chemical composition of 09MnV, 16Mn, and 15MnV steels should comply with the provisions of GB1591-79.
2.2. The specific analysis method shall refer to the relevant parts of GB223-84 "Chemical Analysis Methods for Steel and Alloys".
2.3. Analysis deviation shall refer to GB222-84 "Permissible deviations in chemical composition of samples and finished products for chemical analysis of steel".
application
Fluid conveying pipes, boiler factories, engineering, and mechanical processing factories.