Yield Strength | ≥275 MPA |
Tensile Strength | ≥485MPA |
Elongation | ≥22MPA |
NO | Item | structural features | processing measure | Test content |
1 | cylinder | (1) massive structure (2) L flange (3) finite element analysis (4) Surrounding the manhole mechanical processing | (1)union melt welding (2) Whole annealing after welding (3) polishing treatment (4) Processing and ensure that both ends of the positioning alignment | (1) Material certificate, review material machinery performance and chemical composition (2) Cutting edge around the ultrasonic flaw detection (3) Weld ultrasonic testing |
2 | End cap and Hollow shaft | (1) High quality cast steel (2) R rounded corners (3) High strength bolts connected to the cylinder | (1) Molten steel refining outside the furnace (argon blowing and R - H vacuum processing) (2) Modelling using special sand, strict control of pouring temperature and casting speed (3) Shaft processing, assurance and coaxial degree and the roughness of the face | (1) Mechanical properties and chemical composition of casting billet (internal control standard) (2) Ultrasonic testing after rough machining (3) Ultrasonic testing and magnetic particle inspection after finishing |