What are the advantages of forgings and why should they be selected?
Forgings are widely used in building materials industry. Conceptually, a forging is a metal that exerts pressure to create the desired shape or appropriate compression through plastic deformation.
Forgings are bars forged with forging equipment. Generally, more complex workpieces cannot be forged, which requires a lot of processing. However, the forgings have dense organizational structure and are not prone to internal defects. They are widely used in valve seats, valve cores, valve stems and other valve seats, valve cores, valve stems, etc. In high-pressure and strongly corrosive alloy valves, forged valve bodies are also widely used.
Compared with castings, forged valves have more uniform valve body structure, better density, better strength integrity, better size characteristics and smaller size error. Directional structures (pipes) have higher performance than castings in terms of overall strength and stress.
High strength hot forging promotes crystallization and grain refinement, achieves strength and consistency of materials, and reduces variation between parts. The particle flow flows along the valve body contour, which is conducive to reducing the occurrence of fatigue or common faults.
Structural integrity - forging eliminates internal defects, produces a consistent metallographic structure, and ensures excellent performance. In places where stress and crystal corrosion are serious, forgings can ensure long service life and trouble free service.
Reliability structural integrity forging eliminates internal defects, produces a consistent metallographic structure, and ensures excellent performance. In places where stress and crystal corrosion are serious, forgings can ensure long service life and trouble free service.
Quality assurance - Through the use of forgings, their consistency and high quality, the X-ray demand for Class 1 castings disappeared. The United States Navy has the same attitude when using forgings for nuclear weapons. For finished forgings, all ASME Code requirements are ultrasonic inspection (U.T.), magnetic particle (M.T.) or liquid penetrant test (P.T.). Scrap forgings found by U.T., M.T., or P.T. methods are very rare. The delivery date of parts procurement can be controlled, so the delivery of valves is more reliable.
Directional structure of valve body - the fatigue strength of creep is more than three times that of casting under the environment of large temperature change.
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