AMS 5621 is a grade of stainless steel widely used in various industries, including aerospace, defence, and oil and gas. This steel grade is known for its high strength, excellent corrosion resistance, and exceptional thermal and mechanical properties. In this blog post, we will discuss the composition and physical properties of AMS 5621 material, its mechanical properties and hardness, heat treatment and common applications.
What is AMS 5621?
AMS 5621 (also known as 420 Stainless Steel) is a specification of material requirements for corrosion-resistant steel bars, wire, forgings, rings, and extrusions. This specification covers a range of austenitic stainless steels known for their exceptional corrosion resistance, toughness, and durability in high-temperature environments. AMS5621 is used widely in aerospace, automotive, and marine applications, where resistance to corrosion and wear is paramount. This standard sets specific requirements for the chemical composition, mechanical properties, and heat treatment of these corrosion-resistant steels, ensuring that they meet the high performance and quality standards required by the industry. AMS5621 is a vital tool for engineers and manufacturers alike, guaranteeing their products’ reliable and consistent performance.
What Form Is AMS 5621 Available at Piping Mart?
- Nuts
- Bolts
- Fasteners
- Electrodes
- Sheets Plates
- Tubing
AMS 5621 Composition
AMS 5621 bars is a martensitic stainless steel containing carbon, chromium, nickel, manganese, and silicon elements. The carbon content of this steel is less than 0.15%, while the chromium and nickel content is around 17% and 7%, respectively. The manganese and silicon content is lower, at 1% or less. These elements contribute significantly to the strength, corrosion resistance, and other properties of AMS 5621.
| C | Mn | Si | P | S | Cr | |
|---|---|---|---|---|---|---|
| AMS 5621 | 0.15 max |
1.00 max |
1.00 max |
0.04 max |
0.03 max |
min: 12.0 max: 14.0 |
AMS 5621 Physical Properties
AMS 5621 wires possesses high resistance to corrosion and oxidation in a wide range of environments, including saltwater, acidic, and alkaline solutions. It also exhibits toughness and flexibility, making it easy to work with and form under high temperatures. The density of AMS 5621 is around 7.8 g/cm³, which is slightly higher than other austenitic stainless steel grades.
| Density kg/m^3 |
Thermal Conductivity W/mK |
Electrical Resistivity (Microhm/cm) |
Modulus of Elasticity |
Coefficient of Thermal Expansion µm/m/°C |
Specific Heat (J/kg.K) |
|---|---|---|---|---|---|
| 7750 | 24.9 at 212°F | 550 (nΩ.m) at 68°F | 200 GPa | 10.3 at 32 – 212°F | 460 at 32°F to 212°F |
| – at 932 °F | 10.8 at 32 – 599°F | ||||
| 17.7 at 32-1000°F |
AMS 5621 Mechanical Properties
Regarding its mechanical properties, AMS 5621 tubes is known for its high strength and hardness, even at elevated temperatures. Its ultimate tensile strength can reach up to 185ksi, while its yield strength can be as high as 150ksi. This steel grade also exhibits excellent fatigue and corrosion resistance, which makes it ideal for demanding applications that require optimum performance under extreme conditions.
| Tempering Temperature (°C) | Tensile Strength (MPa) | Yield Strength 0.2% Proof (MPa) |
Elongation (% in 50mm) |
Hardness Brinell (HB) |
|---|---|---|---|---|
| Annealed * | 655 | 345 | 25 | 241 max |
| 399°F (204°C) | 1600 | 1360 | 12 | 444 |
| 600°F (316°C) | 1580 | 1365 | 14 | 444 |
| 800°F (427°C) | 1620 | 1420 | 10 | 461 |
| 1000°F (538°C) | 1305 | 1095 | 15 | 375 |
| 1099°F (593°C) | 1035 | 810 | 18 | 302 |
| 1202°F (650°C) | 895 | 680 | 20 | 262 |
AMS 5621 Equivalents
| Grade | UNS No | Old British | Euronorm | Swedish SS | Japanese JIS | ||
| BS | En | No | Name | ||||
| AMS 5621 | S42000 | 420S37 | 56C | 1.4021 | X20Cr13 | 2303 | SUS 420J1 |
AMS 5621 Uses
AMS 5621 ss is widely used in various industries, such as aerospace, defence, and oil and gas. Due to its high strength and excellent corrosion resistance, this steel grade is suitable for manufacturing critical parts, such as aircraft components, engine parts, and bearings. It is also used in medical and marine applications, where resistance to corrosion and biocompatibility are paramount.
AMS 5621 Hardness
The hardness of AMS 5621 material can vary depending on the tempering and heat treatment. Generally, the steel has a hardness level of 45-50 HRC in its annealed state. However, heat treatment processes such as quenching and tempering can increase its hardness to as much as 60 HRC, making it a highly durable and resistant material for various applications.
AMS 5621 Heat treatment
AMS 5621 steel can be heat-treated through several processes, including annealing, quenching, and tempering. The annealing process involves heating the steel to a high temperature, followed by slow cooling to reduce its hardness and improve its elasticity. Quenching involves rapidly cooling the steel to improve its hardness and strength. Finally, tempering involves heating the steel to a moderate temperature to improve its toughness and reduce its brittleness.
Conclusion:
AMS 5621 material is a highly versatile steel grade with numerous exceptional properties, such as high strength, excellent corrosion resistance, and exceptional thermal and mechanical properties. Its uses range from aerospace, defence, medical, and marine applications. Therefore, understanding its physical and mechanical properties and heat-treatment processes is crucial for designing and manufacturing parts of various internal applications that require optimum performance under extreme conditions.
A passionate metal industry expert and blogger. With over 5 years of experience in the field, Palak brings a wealth of knowledge and insight to her writing. Whether discussing the latest trends in the metal industry or sharing tips, she is dedicated to helping others succeed in the metal industry.
