- Sự miêu tả
17-7Tấm thép không gỉ PH is a precipitation-hardening (PH) stainless steel known for its cường độ cao, chống ăn mòn tốt, and excellent fatigue performance. It is widely used in aerospace, lò xo, thành phần chính xác, and high-stress engineering applications.
Chemical Composition of 17-7PH Stainless Steel
17-7PH is an austenitic–martensitic precipitation-hardening stainless steel.
Typical Composition Range
| Yếu tố | Nội dung (%) | Chức năng |
|---|---|---|
| crom (Cr) | 16–18% | Chống ăn mòn |
| Niken (TRONG) | 6–8% | Stabilizes structure |
| Aluminum (Al) | 0.75–1.5% | Lượng mưa cứng lại |
| Cacbon (C) | ≤0.09% | Controls hardness |
| Mangan (Mn) | ≤1.0% | Improves toughness |
| Silicon (Và) | ≤1.0% | Strength and oxidation resistance |
Key Performance Characteristics of 17-7PH
1. High Strength After Heat Treatment
17-7PH achieves very high strength through precipitation hardening.
- Solution treated state: moderate strength
- Condition CH900: very high tensile strength
2. Chống ăn mòn tốt
- Comparable to 304 stainless steel in many environments
- Suitable for mild atmospheric and industrial conditions
3. Excellent Fatigue Resistance
- Ideal for cyclic loading applications
- Used in springs and flexible components
4. Good Formability in Annealed Condition
- Can be formed before final heat treatment
- Hardened afterward for final performance
Heat Treatment Behavior
17-7PH stainless steel gains properties through controlled heat treatment:
- Giải pháp xử lý
- Conditioning (A or C condition)
- Lượng mưa cứng lại (aging)
This process allows adjustment of:
- Sức mạnh
- độ cứng
- Elastic performance
17-7PH vs 15-7PH Stainless Steel
17-7PH and 15-7PH are both precipitation-hardening stainless steels, but they differ in composition and performance balance.
Sự khác biệt chính
| Tài sản | 17-7PH | 15-7PH |
|---|---|---|
| Nội dung crom | Cao hơn (16–18%) | Thấp hơn (14–15%) |
| Nickel content | Cao hơn | Thấp hơn |
| Strength potential | Rất cao | Cao |
| Chống ăn mòn | Tốt hơn | Thấp hơn một chút |
| độ dẻo dai | Tốt | Vừa phải |
| Fatigue resistance | Xuất sắc | Tốt |
Performance Comparison Summary
17-7PH Advantages
- Chống ăn mòn tốt hơn
- Higher fatigue strength
- More stable performance under cyclic stress
- Better for aerospace-grade applications
15-7PH Advantages
- Slightly easier to process
- Good balance of strength and cost efficiency
- Suitable for general industrial use
Ứng dụng điển hình
17-7PH Stainless Steel Sheet
- Linh kiện hàng không vũ trụ
- High-performance springs
- Diaphragms and bellows
- Precision mechanical parts
- High-stress structural elements
15-7PH Stainless Steel Sheet
- Industrial springs
- Fasteners and clips
- Thành phần kỹ thuật chung
- Medium-stress structural parts
