Nu toate supapele din oțel forjat sunt negre, cum ar fi supapele din oțel forjat din oțel inoxidabil nu vor fi negre. Vă puteți referi la o supapă din oțel forjat din material A105, care este fosfatizat și înnegrit pentru prevenirea ruginii. În general, supapa din oțel forjat din materialul A105 este în general negru de fosfatare.
When selecting valves for industrial applications, the manufacturing method—forging vs. casting—plays a crucial role in performance, durability, and cost. Both supape din oțel forjat și cast steel valves are widely used in oil & gas, chemical, power plants, and water systems, but they differ significantly in strength, pressure handling, and application suitability.
In this blog, we’ll compare:
✔ Manufacturing Process Differences
✔ Mechanical Properties & Performance
✔ Common Applications & Selection Criteria
Process: Heated steel billets are mechanically pressed or hammered into shape under high pressure.
Structure: Grain flow follows the valve’s contours, enhancing strength.
Common Materials: ASTM A105, A182 F22/F91, F304/F316 stainless steel.
Process: Molten steel is poured into a mold and cooled into the desired shape.
Structure: Random grain structure, potentially leading to porosity or inclusions.
Common Materials: ASTM A216 WCB, WCC, A351 CF8/CF8M (stainless).
| Property | Forged Steel Valves | Cast Steel Valves |
|---|---|---|
| Strength | Higher tensile & impact strength | Lower strength, more brittle |
| Pressure Rating | Better for high-pressure (ASME 2500+ psi) | Typically for medium pressure (ASME 600-1500 psi) |
| Durability | More resistant to fatigue & vibration | Prone to cracks under cyclic stress |
| Internal Defects | Fewer defects (denser structure) | Possible porosity/shrinkage voids |
| Size Range | Smaller (usually ≤ 24″) | Larger sizes (up to 80″) available |
| Cost | Higher (labor-intensive forging) | Lower (economical for bulk orders) |
✔ High-pressure systems (e.g., steam lines, hydraulic systems).
✔ Critical safety applications (oil refineries, power plants).
✔ Smaller, high-strength valves (gate, globe, check valves under 24″).
✔ Larger pipe diameters (e.g., water mains, low-pressure pipelines).
✔ Less critical, low/medium-pressure services (cooling systems, drainage).
✔ Cost-sensitive projects where extreme durability isn’t required.
Consider these factors:
Pressure & Temperature: Forged for extreme conditions; cast for moderate.
Size Needed: Cast for large diameters; forged for compact, high-strength needs.
Budget: Cast is cheaper for non-critical uses.
Safety Standards: Forged valves comply with stricter API/ASME specs.
While both forged and cast steel valves have their place in industry, the choice depends on pressure requirements, size, and budget.
Forged valves excel in high-pressure, high-stress environments.
Cast valves are economical for larger, low-pressure systems.
Need help selecting the right valve? Consult an engineer to match your application’s demands with the best manufacturing method!
Did you find this comparison helpful? Let us know if you’d like a deeper dive into material grades (WCB vs. A105) or industry-specific valve standards!
Today we finish this Forged steel gate valve order to Customer order,many thanks for our customer’s support,we are looking forward to next cooperation.
Should you be in need of customized valves and based on our 48 years of experience in this field solely, would you consider working with us?please send sales@stvalves.com to get the drawing and price.
