English 
| Quantity: | |
|---|---|
High voltage and high-frequency switch: high strength+high fatigue life, long-term opening and closing without bending, continuous, and failure.
Corrosive medium (water/oil/acid alkali/chloride ions): Forging dense+15-5PH corrosion resistance, reducing pitting corrosion, stress corrosion cracking.
Precision sealing requirements: stable size, good surface quality, easy precision machining to ensure sealing fit with valve seat/packing.
Long lifespan and high reliability: Its comprehensive performance is superior to that of cast/ordinary stainless steel, reducing replacement and maintenance costs.
International grade: 15-5PH (UNS S15500)
Chinese grade: 05Cr15Ni5Cu4Nb (GB/T 1220-2019)
European grade: X5CrNiCuNb15-5 (1.4545)
Execution standards: ASTM A564/A693, AMS 5659, JB 4728 (pressure vessel forgings)
Element | C | Si | Mn | P | S | Cr | Ni | Cu | Nb | Fe |
Content | ≤0.07 | ≤1.00 | ≤1.00 | ≤0.03 | ≤0.03 | 14.0-15.5 | 3.5-5.5 | 2.5-4.5 | 0.15-0.45 | margin |
Heat treatment state | Tensile strength (MPa) | Yield strength (MPa) | Elongation (%) | Hardness (HRC) | Impact energy (J) |
Solid solution (A) | ≤965 | ≤725 | ≥20 | ≤27 | |
H900 | 1310-1450 | ≥1170 | ≥4 | 40-45 | ≥27 |
H1025 | ≥1030 | ≥860 | ≥14 | 32-38 | ≥34 |
H1150 | ≥860 | ≥725 | ≥18 | 27-33 | ≥40 |
Cutting: 15-5PH forged rod/electric slag remelted steel ingot
Forging: billet making → pre forging → precision forging (ensuring coaxiality and streamline)
Rough machining: leaving a margin for precision machining
Solid solution treatment
Precision machining: outer circle, thread, square head, sealing groove (soft and easy to machine in solid solution state)
Time hardening (aging after precision machining to avoid deformation)
Surface treatment: Grinding/polishing (Ra ≤ 0.8), hard chromium plating, nitriding (optional)
Testing: Hardness, Non destructive Testing (UT/PT), Dimensions, Mechanical Properties
Oil/natural gas: high-pressure wellhead, gathering and transportation, sulfur-containing/chlorinated oil and gas, subsea/deep-sea valves.
Chemical/Petrochemical: acid, alkali, salt, solvent, high temperature and high pressure process pipelines.
Ocean/Ship: seawater, chloride, salt spray, deck/bilge/platform valves.
Energy and electricity: thermal power (high-temperature steam), nuclear power (nuclear grade/radiation resistant), geothermal power.
Aerospace: Onboard hydraulic, fuel, and pneumatic systems (high stress/fatigue resistance).
High end equipment: precision hydraulic, high-pressure instruments, pharmaceutical/food hygiene grade, semiconductor high-purity systems.
