目录简介 | Contents Forwards 1. Scope 2. Normative References 3. order content 4. Dimension, shape and weight 4.1 Outside diameter and wall thickness 4.2 Allowable deviation of outside diameter and wall thickness 4.3 Length 4.4 Tortuosity factor 4.5 Noncircularity and wall unevenness 4.6 Terminal shape 4.7 Weight 5. Technical requirements 5.1 Grade of steel and chemical composition 5.2 Manufacturing method 5.3 Delivery state 5.4 Mechanical properties 5.5 Technical properties 5.6 Surface quality 5.7 Nondestructive test 6. Test method 7. Inspection rules 8. Packaging, marking and quality certification |