Stainless Steel 17-4 PH CNC Machining Material
Stainless Steel 17-4 PH (Precipitation Hardening), also known as Grade 630, is a chromium-copper precipitation hardening stainless steel used for applications requiring high strength and a moderate level of corrosion resistance. It stands out because its mechanical properties can be adjusted through heat treatment. At JUCHENG, we specialize in machining 17-4 PH in various conditions—from the annealed "Condition A" to fully hardened states like H900. This versatility makes it the premier choice for aerospace structural components, oil & gas valve parts, and high-performance shafts that must endure extreme stress without rusting.
Acciaio Inossidabile 17-4 PH
JUCHENG's 17-4 PH Machining Capabilities
Processing precipitation-hardening steel requires a deep understanding of metallurgy and machining dynamics. We offer:
- Heat Treatment Expertise: We machine parts in the softer annealed state and then perform precise precipitation hardening (aging) processes (e.g., H900, H1025, H1150) to achieve your specific hardness and strength requirements.
- Fresatura dura: For parts requiring extreme precision, we can finish-machine fully hardened 17-4 PH using advanced cermet and ceramic tooling to eliminate post-heat-treat distortion.
- Stabilità dimensionale: 17-4 PH is known for low distortion during heat treatment. We optimize our machining strategy to leverage this, holding tight geometric tolerances.
- Passivazione: We provide chemical passivation to maximize corrosion resistance after machining, ensuring the passive oxide layer is fully restored.
Advantages of CNC Machining 17-4 PH
| Vantaggio | Descrizione dettagliata | Beneficio principale |
| Adjustable Strength | Mechanical properties can be tuned via heat treatment (aging). | Allows customization of hardness vs. toughness for specific applications. |
| Elevato carico di snervamento | Can achieve yield strengths up to 1100-1300 MPa (in H900 condition). | Comparable to high-strength alloy steels, but with stainless properties. |
| Good Corrosion Resistance | Better than 400-series (martensitic) stainless, approaching that of 304. | Suitable for chemical, petrochemical, and food processing environments. |
| Stabilità dimensionale | Minimal distortion during heat treatment compared to quench-and-temper steels. | Ideal for long, slender parts or complex geometries requiring tight tolerances. |
| Resistenza all'usura | Hardened surfaces resist galling and wear. | Excellent for gears, pump shafts, and valve stems. |
Parametri tecnici e norme sui materiali
We process 17-4 PH in various conditions tailored to your needs:
| Categoria del Grado | Condition / Temper | Caratteristiche e usi ideali |
| Condition A | Solution Annealed | Characteristics: The standard supply condition. Softest state (though still hard compared to 304). Used for machining before heat treatment. Uses: General machining stock, parts requiring forming. |
| Condition H900 | Peak Aged (900°F) | Characteristics: Maximum strength and hardness. Lower toughness/ductility. Uses: High-stress gears, aircraft fittings, pump shafts requiring max wear resistance. |
| Condition H1150 | Overaged (1150°F) | Characteristics: Lower strength but significantly improved toughness and ductility. Good for low temperatures. Uses: Valve parts, heavy-duty structural components subjected to shock. |
CNC Machining Guidelines for 17-4 PH
- Lavorabilità: In Condition A, machinability is fair (similar to 304). In hardened states (H900), it becomes much more difficult, requiring rigid setups and slower speeds.
- Utensileria: We use premium micro-grain carbide tools with TiAlN coatings to withstand the heat and abrasion.
- Refrigerante: High-pressure coolant is essential to break chips and extend tool life.
- Post-lavorazione: Allowance must be left if machining is done before heat treatment, although 17-4 PH shrinks very predictably (approx. 0.0004-0.0006 in/in).
Scenari Applicativi
- Aerospaziale: Engine components, structural flap tracks, landing gear parts.
- Petrolio e Gas: Gate valves, downhole tooling, pump shafts exposed to sour gas.
- Medico: Surgical instruments requiring high strength and edge retention.
- Lavorazione alimentare: Mixing blades and drive shafts (where 304 is too weak).
- Marino: Propeller shafts and high-strength fasteners.
Tabella delle Proprietà Fisiche
Comparison: Condition A vs. H900:
| Proprietà | Condition A (Annealed) | Condition H900 (Hardened) | Unità |
| Densità | 7.75 | 7.75 | g/cm³ |
| Resistenza a Trazione | ~ 1035 | 1310 | MPa |
| Carico di Snervamento | ~ 760 | 1170 | MPa |
| Allungamento | - | 10 | % |
| Durezza | 33 HRC (Max) | 44 HRC | Rockwell C |
| Magnetico | Sì | Sì | - |
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