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When searching for “17-4PH Plate Suppliers”, buyers are usually looking for a high-strength stainless steel material that combines excellent mechanical strength, corrosion resistance, and heat-treatable properties. 17-4PH is widely used in aerospace, marine, chemical, and precision engineering industries.
What Is 17-4PH Stainless Steel?
17-4PH stainless steel is a precipitation-hardening (PH) martensitic stainless steel. It is one of the most important high-strength stainless steel grades in industrial applications.
The name “17-4PH” comes from its typical composition:
- Approximately 17% chromium
- Approximately 4% nickel
Chemical Composition of 17-4PH
| Element | Typical Content | Function |
|---|---|---|
| Chromium (Cr) | ~15–17.5% | Corrosion resistance |
| Nickel (Ni) | ~3–5% | Toughness and stability |
| Copper (Cu) | ~3–5% | Precipitation strengthening |
| Niobium (Nb) | Small amount | Strengthening phase formation |
| Carbon (C) | Low level | Improves hardness control |
This combination allows the material to achieve high strength through controlled heat treatment.
Key Performance Characteristics
1. High Strength After Heat Treatment
17-4PH can reach very high tensile strength after aging treatment, making it suitable for load-bearing applications.
2. Good Corrosion Resistance
It provides corrosion resistance close to standard stainless steels in many environments, especially in atmospheric and mild chemical conditions.
3. Excellent Mechanical Stability
The material maintains stable mechanical properties after heat treatment, with good fatigue resistance.
4. Good Machinability (in Solution Annealed Condition)
It can be easily machined before final heat treatment.
Why Many 17-4PH Plates Require Custom Production
Unlike common stainless steel grades such as 304 or 316, 17-4PH stainless steel often requires customization due to its special processing characteristics.
1. Heat Treatment Requirement
The final properties of 17-4PH depend heavily on heat treatment conditions:
- Solution treatment (Condition A)
- Aging treatments (H900, H1025, H1150, etc.)
Each condition produces different strength and hardness levels, so customers often need specific requirements.
2. Different Strength Levels for Different Applications
| Condition | Strength Level | Typical Use |
|---|---|---|
| H900 | Very high strength | Aerospace components |
| H1025 | Balanced strength and toughness | Industrial shafts |
| H1150 | Better toughness | Marine and structural parts |
Because performance varies significantly, many projects require custom heat treatment specifications.
3. Precision Engineering Requirements
Industries such as aerospace, oil & gas, and medical equipment require:
- Tight thickness tolerance
- Specific mechanical properties
- Certified material traceability
- Customized cutting and machining
4. Limited Standard Stock Availability
Compared with common stainless steels, 17-4PH is:
- Less commonly stocked in large volumes
- Often produced based on order specifications
- Frequently supplied in semi-finished condition for further processing
Applications of 17-4PH Stainless Steel Plate
- Aerospace structural components
- Pump shafts and valve parts
- Marine engineering equipment
- Chemical processing equipment
- High-strength mechanical parts
- Precision industrial components
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TIANJIN TEDA GANGHUA
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