ThePipingMart Blog Grades AMS 6444 – Composition, Properties, and Uses

AMS 6444 – Composition, Properties, and Uses

AMS 6444

Have you ever heard of AMS 6444? It is a popular alloy widely used in industrial and mechanical applications. This special alloy boasts excellent strength, wear resistance, and machinability, making it a popular choice for various applications. This blog post will delve deeper into what makes AMS 6444 special. We will explore its composition, physical and mechanical properties, uses, and heat treatment.

What is AMS 6444?

AMS 6444 (also known as Alloy Steel 52100) is a low-alloy steel primarily composed of carbon, manganese, nickel, and chromium. It is a high-strength alloy that can be heat-treated to achieve different properties, depending on the intended application. AMS6444 also has excellent resistance to wear and abrasion, making it an ideal material for cutting tools, gears, and other components constantly subjected to frictional forces.

What Form is AMS 6444 Available at Piping Mart?

  • Bars

AMS 6444 Composition

As previously mentioned, AMS 6444 primarily comprises carbon, manganese, nickel, and chromium. The exact composition can vary depending on the manufacturer’s specifications. Typically, AMS 6444 has carbon levels between 0.33% and 0.38%, manganese levels between 0.60% and 0.90%, nickel levels between 1.65% and 2.00%, and chromium levels between 0.70% and 0.95%. The absence of other alloying elements, such as molybdenum and vanadium, makes AMS 6444 an affordable alternative to other high-strength alloys.

Element Content (%)
Iron, Fe 96.5 – 97.32
Chromium, Cr 1.30 – 1.60
Carbon, C 0.980 – 1.10
Manganese, Mn 0.250 – 0.450
Silicon, Si 0.150 – 0.300
Sulfur, S ≤ 0.0250
Phosphorous, P ≤ 0.0250

AMS 6444 Physical Properties

AMS 6444 has a density of 7.85 g/cm³ and a melting point of 1420-1465°C. This alloy also has a relatively high thermal conductivity of 46.6 W/mK, making it an ideal material for applications that require efficient heat transfer. The coefficient of thermal expansion (CTE) for AMS 6444 is 11.8 µm/m°C. The high CTE ensures that the material can expand and contract uniformly when subjected to temperature changes, minimizing the risk of thermal stress and deformation.

Properties Metric Imperial
Density 7.81 g/cm3 0.282 lb/in³
Melting point 1424°C 2595°F

AMS 6444 Mechanical Properties

The mechanical properties of AMS 6444 can vary depending on the heat treatment employed. Typically, the minimum tensile strength of this alloy is 1379 MPa, and its minimum yield strength is 1207 MPa. The elongation at break for AMS 6444 is 13%, indicating that this alloy can withstand significant deformation before failure. The Rockwell hardness of AMS 6444 can range from RC 38 to RC 43, making it a reasonably hard and durable alloy that can withstand significant wear and tear.

Properties Metric Imperial
Bulk modulus (typical for steel) 140 GPa 20300 ksi
Shear modulus (typical for steel) 80 GPa 11600 ksi
Elastic modulus 190-210 GPa 27557-30458 ksi
Poisson’s ratio 0.27-0.30 0.27-0.30
Hardness, Brinell
Hardness, Knoop (converted from Rockwell C hardness) 875 875
Hardness, Rockwell C (quenched in oil from 150°C tempered) 62 62
Hardness, Rockwell C (quenched in water from 150°C tempered) 64 64
Hardness, Rockwell C (quenched in oil) 64 64
Hardness, Rockwell C (quenched in water) 66 66
Hardness, Vickers (converted from Rockwell C hardness) 848 848
Machinability (spheroidized annealed and cold drawn. Based on 100 machinability for AISI 1212 steel) 40 40

AMS 6444 Thermal Properties

Properties Metric Imperial
Thermal expansion co-efficient (@ 23-280°C/73.4- 36°F, annealed) 11.9 µm/m°C 6.61 µin/in°F
Thermal conductivity (typical steel) 46.6 W/mK 323 BTU in/hr.ft².°F

AMS 6444 Uses

AMS 6444 is an alloy widely used in industrial and mechanical applications. This alloy’s excellent strength, wear resistance, and machinability make it suitable for cutting tools, gears, and other components constantly subjected to frictional forces. AMS 6444 is also ideal for manufacturing components that must withstand high loads and pressures, such as hydraulic pistons, pump shafts, and landing gear struts. Additionally, the high thermal conductivity of AMS 6444 makes it ideal for manufacturing heat exchangers, boilers, and other components that require efficient heat transfer.

AMS 6444 Heat Treatment

Depending on the application’s requirements, AMS 6444 can be heat-treated to achieve different properties. Quenching and tempering are the two most common heat treatment processes employed for AMS 6444. Quenching involves rapidly cooling the alloy after heating it to a high temperature. This process enhances the steel’s hardness and strength but reduces its flexibility. Tempering, on the other hand, involves reheating the quenched steel to a lower temperature to improve its flexibility and toughness. The heat treatment process used for AMS 6444 can vary depending on the application’s requirements.

AMS 6444 Hardness

AMS 6444 steel is renowned for its impressive hardness and durability. Whether you’re working on aerospace components or industrial machinery, AMS 6444 is a reliable and effective choice. With its exceptional resistance to wear and tear, you can be confident that this material will stand the test of time in even the most demanding applications. So if you’re looking for a high-performance material that won’t disappoint, consider the benefits of AMS 6444.

Conclusion

In conclusion, AMS 6444 material is an alloy with excellent strength, wear resistance, and machinability, making it a popular choice for various industrial and mechanical applications. Its unique composition of carbon, manganese, nickel, and chromium ensures that this alloy can withstand significant wear and tear, making it ideal for cutting tools, gears, and components constantly subjected to frictional forces. The alloy’s physical and mechanical properties, combined with the various heat treatment options, make AMS 6444 an incredibly versatile alloy that can be tailored to meet specific application requirements. Whether you’re manufacturing hydraulic pistons, heat exchangers, or landing gear struts, AMS 6444 is an ideal material to consider.

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