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.
Stainless Steel 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.
- Hard Milling: 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.
- Dimensional Stability: 17-4 PH is known for low distortion during heat treatment. We optimize our machining strategy to leverage this, holding tight geometric tolerances.
- Passivation: 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
| Advantage | Detailed Description | Key Benefit |
| Adjustable Strength | Mechanical properties can be tuned via heat treatment (aging). | Allows customization of hardness vs. toughness for specific applications. |
| High Yield Strength | 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. |
| Dimensional Stability | Minimal distortion during heat treatment compared to quench-and-temper steels. | Ideal for long, slender parts or complex geometries requiring tight tolerances. |
| Wear Resistance | Hardened surfaces resist galling and wear. | Excellent for gears, pump shafts, and valve stems. |
Technical Parameters & Material Standards
We process 17-4 PH in various conditions tailored to your needs:
| Grade Category | Condition / Temper | Characteristics & Ideal Uses |
| 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
- Machinability: In Condition A, machinability is fair (similar to 304). In hardened states (H900), it becomes much more difficult, requiring rigid setups and slower speeds.
- Tooling: We use premium micro-grain carbide tools with TiAlN coatings to withstand the heat and abrasion.
- Coolant: High-pressure coolant is essential to break chips and extend tool life.
- Post-Machining: 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).
Application Scenarios
- Aerospace: Engine components, structural flap tracks, landing gear parts.
- Oil & Gas: Gate valves, downhole tooling, pump shafts exposed to sour gas.
- Medical: Surgical instruments requiring high strength and edge retention.
- Food Processing: Mixing blades and drive shafts (where 304 is too weak).
- Marine: Propeller shafts and high-strength fasteners.
Physical Properties Table
Comparison: Condition A vs. H900:
| Property | Condition A (Annealed) | Condition H900 (Hardened) | Unit |
| Density | 7.75 | 7.75 | g/cm³ |
| Tensile Strength | ~ 1035 | 1310 | MPa |
| Yield Strength | ~ 760 | 1170 | MPa |
| Elongation | - | 10 | % |
| Hardness | 33 HRC (Max) | 44 HRC | Rockwell C |
| Magnetic | Yes | Yes | - |
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ㆍConfidentialité : Nous respectons votre vie privée. Vous trouverez ici un exemple d' accord de non-divulgation. En soumettant ce formulaire, vous acceptez nos conditions générales et notre politique de confidentialité.
