ThePipingMart Blog Grades AMS 5646 Stainless Steel – Composition, Properties, and Uses

AMS 5646 Stainless Steel – Composition, Properties, and Uses

AMS 5646

AMS5646 is a type of stainless steel widely used in various industries. It is a popular material in manufacturing because of its superior strength, corrosion resistance, and durability. Many industries rely on AMS 5646 because of its versatility and reliability. This blog post will discuss the composition, physical properties, mechanical properties, uses, hardness, and heat treatment of AMS5646. This information will give you a better understanding of this stainless steel and help you make informed decisions about its use in your industry.

What is AMS 5646?

AMS 5646 (also known as 347 Stainless Steel) is a type of stainless steel designed for high-temperature environments. Its ability to withstand extreme heat and maintain its strength and durability makes it a highly sought-after material in the aerospace, automotive, and energy industries. But what sets AMS5646 apart from other types of stainless steel is its superior corrosion resistance, making it ideal for use in harsh chemical environments. Whether you’re building a jet engine, a nuclear reactor, or a chemical processing plant, AMS5646 is a reliable and versatile material that can help you achieve your goals.

AMS 5646 Composition

AMS5646 bar is an austenitic stainless steel that contains chromium, nickel, and molybdenum. The chromium content provides AMS 5646 with excellent corrosion resistance properties, while the nickel content makes it non-magnetic and enhances the material’s flexibility. The molybdenum content further improves the material’s strength and endurance. The chemical composition of AMS 5646 is as follows: Carbon (max 0.08%), Manganese (max 2.00%), Silicon (max 1.00%), Phosphorus (max 0.045%), Sulfur (max 0.030%), Chromium (17.00%-19.00%), Nickel (9.00%-13.00%), Molybdenum (0.50%-0.65%).

Element 347
Carbon 0.08
Chromium 17.0-19.0
Nickel 9.0-13.0
Manganese 2.00
Silicon 0.75
Phosphorus 0.045
Sulfur 0.030
Niobium 10 x C min / 1.00 max

AMS 5646 Physical Properties

AMS 5646 has a density of 7.93 g/cm³ at room temperature. The material has a melting point of 1399°C and a boiling point of 2800°C. AMS 5646 also has a relatively low thermal and high electrical conductivity, making it ideal for electrical applications. Additionally, AMS 5646 has a coefficient of thermal expansion of 17.2 µm/m°C at 20°C.

Physical Properties
Density ( ) 7.93
Melting point (°C ) 1400-1425

AMS 5646 Mechanical Properties

AMS 5646 bars has excellent mechanical properties, including high tensile and yield strength. Its ultimate tensile strength is around 690 MPa, while its yield strength is typically 295 MPa. The material also has good elongation and area reduction, indicating its ductility. The modulus of elasticity for AMS 5646 is 200 GPa.

Mechanical Properties
Elongation at break ( % ) <60
Hardness – Brinell 160-190
Izod impact strength ( J.m-1 ) 20-136
Modulus of elasticity ( GPa ) 190-210
Tensile strength ( MPa ) 520-1100

AMS 5646 Uses

AMS 5646 is used in various industries, such as aerospace, chemical processing, and medical equipment. In aerospace, AMS 5646 is commonly used to make components for jet engines and aircraft structures. In chemical processing, it is used in equipment that has to withstand a corrosive environment. AMS 5646 is also used in medical equipment such as surgical instruments and implants.

AMS 5646 Hardness

AMS 5646 has a hardness range of 28-32 HRC (Rockwell hardness scale). This value indicates that it is a relatively hard material, making it suitable for applications that require resistance to wear and tear, such as cutting tools and bearings.

AMS 5646 Heat Treatment

AMS 5646 can be heat-treated to improve its mechanical properties. Annealing can be done at 1010-1120 °C, followed by quenching in water, where hardness can be increased by 100-200% by cooling in oil or air.


AMS 5646 material is a highly versatile and reliable stainless steel widely used in various industries. Its excellent properties, strength, flexibility, and corrosion resistance, make it a popular choice for many applications. Understanding the composition, physical and mechanical properties use, hardness, and heat treatment of AMS 5646 can help you choose the right material for your industry. If you have any questions or need assistance selecting the right material for your application, please contact us; we will be happy to help.

Related Post