This national standard specifies order content, size, shape, weight, technical requirements, test methods, test rules, packaging, marking and quality certificate of seamless steel tubes for structural purposes.
This Standard is applicable to seamless steel tubes for mechanical and general engineering structural purposes.
Contents
Forwards I
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
