Forged Steel Valves vs. Cast Steel Valves
Forged steel valves are superior to cast steel valves in terms of quality, as they can withstand greater impact forces and have higher mechanical properties such as plasticity, toughness, and other aspects. However, their nominal pipe size is generally smaller, typically below DN50. Cast steel valves usually have lower pressure ratings, with common nominal pressures being PN16, PN25, PN40, and 150LB-900LB. Forged steel valves come in grades such as PN100, PN160, PN320, and 1500LB-3500LB. Cast steel is primarily used for manufacturing parts that are complex in shape, difficult to forge or machine, yet require high strength and plasticity.
Casting is a liquid forming process, while forging is a plastic deformation process. Forging shapes can improve the internal structure, offering good mechanical properties and uniform grain structure. Critical and heavily loaded parts must be forged, as casting can lead to segregation and structural defects. Of course, casting has its advantages as well. For complex shapes, forging is difficult to mold, making casting a more feasible option.
