If you are in the aerospace industry, you are familiar with AMS-DTL-22499 stainless steel. But if you are not, you might wonder what it is and why it is essential. AMS-DTL-22499 is a specification for stainless steel bars, wire, forgings, and extrusions used in aircraft engine and airframe components. This specification outlines the stainless steel’s composition, physical and mechanical properties, and heat treatment. This blog post will discuss everything you need to know about AMS-DTL-22499.
AMS-DTL-22499 stainless steel is martensitic stainless steel that contains chromium, nickel, and molybdenum. The chromium content is high, which provides excellent corrosion resistance. The nickel content gives the steel high toughness and ductility. The molybdenum content improves the strength and hardness of the steel. The maximum carbon content is 0.12%, which makes the steel easier to form and machine.
AMS-DTL-22499 Physical Properties
The physical properties of AMS-DTL-22499 stainless steel are as follows
- Density: 7.85 g/cm3
- Electrical resistivity: 0.73 × 10-6 Ωm
- Thermal conductivity: 24.9 W/mK
- Specific heat capacity: 477 J/kgK
- Thermal expansion coefficient: 11.7 × 10-6/K
AMS-DTL-22499 Mechanical Properties
The mechanical properties of AMS-DTL-22499 stainless steel depending on the heat treatment. In the annealed condition, the steel has the following properties:
- Tensile strength: 690 MPa
- Yield strength: 415 MPa
- Elongation: 20%
- Hardness: 207 Brinell
AMS-DTL-22499 stainless steel is used in many aircraft engines and airframe components such as turbine blades, compressor disks, turbine vanes, and fasteners. It is also used in high-performance racing engine components and medical instruments.
AMS-DTL-22499 stainless steel can be hardened by heat treatment. The hardness can reach up to 50 HRC (Rockwell hardness). The hardness of the steel depends on the heat treatment, so it is important to follow the specifications.
AMS-DTL-22499 Heat Treatment
The heat treatment of AMS-DTL-22499 stainless steel involves the following steps:
Heating the steel to 760-820°C, holding it for one hour, then slowly cooling it in the furnace or air.
Heating the steel to 1010-1060°C and quenching it in oil or air to achieve the desired hardness.
Reheating the hardened steel to 500-650°C and holding it for one hour, then cooling it in air.
AMS-DTL-22499 stainless steel is a high-performance martensitic stainless steel used in aircraft engines and airframe components. It has excellent corrosion resistance, toughness, and flexibility. The steel can be heat-treated to achieve high hardnesses, which makes it useful in many applications. If you work in the aerospace industry, it is important to know the specifications of AMS-DTL-22499 and how to heat-treat it properly.
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