What is the difference between forged steel and cast steel valves?
Forged steel valves are made from forged billets (A105, F304, F316, F51) that have been heated and hammered/squeezed into shape, resulting in finer grain structure, higher strength, and better resistance to thermal fatigue and pressure shocks. Cast steel valves (WCB, CF8, CF8M) are made by pouring molten steel into molds. Forged valves are used for high-pressure (Class 800+), high-temperature, and cyclic service. Cast valves are more economical for low-to-medium pressure and larger sizes.
What pressure ratings are forged steel valves available in?
TANGGONG forged steel valves are available in Class 800 (PN130), Class 1500 (PN260), Class 2500 (PN420), and occasionally Class 3000 for specialty needle valves. The most common rating for forged steel valves is Class 800 to Class 1500. For sizes above DN100 (4"), cast steel valves are typically used instead due to forging size limitations.
What materials are TANGGONG forged steel valves made from?
TANGGONG forged steel valves are manufactured from: (1) A105 — carbon steel for general high-pressure service; (2) LF2 — low-temperature carbon steel for sub-zero service down to -46°C; (3) F304/F304L — austenitic stainless steel for corrosive media; (4) F316/F316L — Mo-containing stainless steel for chloride environments; (5) F51/F53 — duplex stainless steel for seawater and aggressive corrosion. Material test reports (MTRs) are provided with every valve.
What are forged steel valves used for?
Forged steel valves are used in: (1) Power station boiler feedwater and steam systems (up to 650°C); (2) Oil & gas wellhead and production lines; (3) Refinery high-pressure process units; (4) Chemical high-pressure reactors and heat exchangers; (5) Instrumentation and sampling lines; (6) Hydraulic and high-pressure utility systems. Their compact size and high-pressure capability make them ideal for these demanding applications.
How to select between forged and cast valve body material?
Selection criteria: (1) Pressure rating — Class 800+ requires forged body; (2) Size — DN6 to DN100 (1/4" to 4") typically forged, DN125+ typically cast; (3) Temperature — cyclic high-temperature (steam) favors forged; (4) Cost — cast is more economical for low-pressure large sizes; (5) Lead time — forged valves often have shorter lead times for standard materials. TANGGONG engineers provide free material selection consultation based on your line conditions.
