Table of content
Introduction
AMS 5643 is a type of 17-4PH stainless steel, which is mostly used in some high-strength and corrosion-resistant applications. These include aviation, aerospace and precision parts. Because AMS 5643 has strong performance, and its hardness can be further enhanced after heat treatment, it is also highly corrosion-resistant.
If you need to know more about this material, I hope this article can help you. This article will introduce AMS 5643 in detail and its applications.
What Does AMS 5643 Stand For?
AMS is mostly used for aerospace material specifications. It is a standard issued and formulated by SAE International (American Society of Automotive Engineers). This standard material has good regulations on its chemical properties, composition and mechanical properties.
Therefore, this material is usually a specific grade of stainless steel. It is mainly 17-4PH (precipitation hardening) stainless steel. The properties of this steel are all specific.
What Is 17-4PH Stainless Steel?
17-4PH is a type of martensitic precipitation hardening stainless steel. Its composition contains 17% chromium, 4% nickel and some copper, manganese, silicon and niobium. After heat treatment, steel containing these metals will have stronger long-term strength, hardness and corrosion resistance.
Key Properties of 17-4PH (AMS 5643):
- High strength (tensile strength and yield strength)
- Corrosion resistance
- Higher performance after heat treatment
- Mostly used for high-precision parts
Typical Heat Treatments for AMS 5643
| Condition | Aging Temp (°F) | Tensile Strength (ksi) | Hardness (HRC) |
|---|---|---|---|
| H900 | 900 | ~200 ksi | 44–47 |
| H1025 | 1025 | ~170 ksi | 38–42 |
| H1150 | 1150 | ~140 ksi | 28–32 |
The heat treatment states of AMS 5643 are: H900, H1025, H1150, etc. Different numbers represent different aging temperatures after solution treatment. The higher the heat treatment temperature, the lower the strength, but the toughness will become better and better.
Forms Covered by AMS 5643
Usually includes:
- Bars
- Wire
- Forgings
- Mechanical tubing
- Flash welded rings
- Stock for forging
Applications of AMS 5643 Material
Due to its high strength and high corrosion resistance, it is widely used:
Aerospace direction:
- Landing gear
- Turbine engine parts
- Actuator pins and shafts
Medical device direction:
- Surgical supplies
- Medical implants
Industrial machinery direction:
- Fasteners
- Mechanical seals
- Pump shafts
Oil and gas direction:
- Drilling equipment
- Valve controllers
AMS 5643 vs. Other Stainless Steels
| Grade | Type | Key Feature |
|---|---|---|
| AMS 5643 | 17-4PH (Precipitation-hardening) | Heat-treatable, high strength |
| 304 | Austenitic | Good corrosion resistance |
| 316 | Austenitic | Best for marine environments |
| 440C | Martensitic | Very hard, less corrosion-resistant |
AMS 5643 has high performance, so it is not common in daily life. It is used in some high-precision products.
Summary
AMS 5643 is a high-strength stainless steel, mostly used in some high-precision products, such as aviation and medical. Because AMS 5643 has high strength and corrosion resistance. Because of its high performance, the price will also be higher, so it is not often used in daily life. It is mostly used in some high-demand industries.
One thing to note is that the material state you need is H900 or H1025. The two different heat treatment states have a certain impact on its mechanical properties.
If you need high precision and high pressure, and still have high performance in a humid or chemical environment, then choose AMS 5643.
