AMS 6346 Alloy Steel – Composition, Properties, and Uses
AMS6346 is a low-alloy steel with exceptional mechanical properties at high temperatures, making it a popular choice for applications requiring strength and durability. It is commonly used in the aerospace industry, as well as in the military and defence sectors. This blog post will explore the composition, physical and mechanical properties, uses, hardness, and heat treatment of AMS 6346 steel.
What is AMS 6346?
AMS 6346 (also known as 4130 Alloy Steel) steel is known for its exceptional strength and durability, making it ideal for critical components like landing gears, wing spars, and engine mounts. AMS6346 sets the standards for the manufacturing and testing this high-performance material, ensuring that it meets the rigorous demands of the aviation industry. With its impressive mechanical properties and strict quality control standards, it’s no wonder why AMS6346 is a vital part of aerospace engineering.
What Form is AMS 6346 Available at Piping Mart?
- Alloy Steel AISI4130 Bars
AMS 6346 Composition
AMS 6346 is a low-alloy steel that contains a blend of nickel, chromium, and molybdenum. Its composition also includes small amounts of carbon, manganese, and other trace elements. Adding these elements gives the steel high strength and exceptional resistance to wear and fatigue.
| Element | Content (%) |
|---|---|
| Iron, Fe | 97.03 – 98.22 |
| Chromium, Cr | 0.80 – 1.10 |
| Manganese, Mn | 0.40 – 0.60 |
| Carbon, C | 0.280 – 0.330 |
| Silicon, Si | 0.15 – 0.30 |
| Molybdenum, Mo | 0.15 – 0.25 |
| Sulfur, S | 0.040 |
| Phosphorous, P | 0.035 |
AMS 6346 Physical Properties
AMS 6346 has a density of 7.85 g/cm3 and a melting point of approximately 1416°C. It exhibits good corrosion resistance, making it suitable for harsh environments. The steel also maintains its strength at high temperatures, making it ideal for applications that require stability and durability.
| Properties | Metric | Imperial |
|---|---|---|
| Density | 7.85 g/cm3 | 0.284 lb/in³ |
| Melting point | 1432°C | 2610°F |
AMS 6346 Mechanical Properties
AMS 6346 is known for its high strength and excellent toughness. It has a tensile strength of 670 MPa and a yield strength of 380 MPa. The steel is also highly resistant to fatigue and can withstand repeated stress and strain without breaking or cracking. Its toughness and resistance to wear make it a suitable choice for applications that require durability, such as aerospace components, military hardware, and oil and gas drilling equipment.
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength, ultimate | 560 MPa | 81200 psi |
| Tensile strength, yield | 460 MPa | 66700 psi |
| Modulus of elasticity | 190-210 GPa | 27557-30458 ksi |
| Bulk modulus (Typical for steel) | 140 GPa | 20300 ksi |
| Shear modulus (Typical for steel) | 80 GPa | 11600 ksi |
| Poissons ratio | 0.27-0.30 | 0.27-0.30 |
| Elongation at break (in 50 mm) | 21.50% | 21.50% |
| Reduction of area | 59.6 | 59.60% |
| Hardness, Brinell | 217 | 217 |
| Hardness, Knoop (Converted from Brinell hardness) | 240 | 240 |
| Hardness, Rockwell B (Converted from Brinell hardness) | 95 | 95 |
| Hardness, Rockwell C (Converted from Brinell hardness, value below normal HRC range, for comparison purposes only.) | 17 | 17 |
| Hardness, Vickers (Converted from Brinell hardness) | 228 | 228 |
| Machinability (Annealed and cold drawn. Based on 100% machinability for AISI 1212 steel.) | 70 | 70 |
AMS 6346 Equivalents
| AMS 6348 | AMS 6371 | ASTM A331 | ASTM A829 | DIN 1.7218 |
| AMS 6350 | AMS 6373 | ASTM A506 | MIL S-18729 | UNI 25 CrMo 4 |
| AMS 6351 | AMS 6374 | ASTM A507 | MIL S-6758 | JIS SCCrM 1 |
| AMS 6360 | AMS 6528 | ASTM A513 | SAE J1397 | JIS SCM 2 |
| AMS 6361 | AMS 7496 | ASTM A519 | SAE J404 | SS 2225 |
| AMS 6362 | ASTM A29 | ASTM A646 | SAE J412 | B.S. CDS 110 |
| AMS 6370 | ASTM A322 | ASTM A752 | AFNOR 25 CD 4 (S) | SAE J770 |
AMS 6346 Uses
AMS 6346 is commonly used in the aerospace industry for structural components, such as engine mounts, landing gear, and turbine blades. It is also used for military and defence applications, including tank armour, missile containers, and weapon enclosures. In addition, AMS 6346 is used for drilling equipment in the oil and gas industry and high-performance racing engines.
AMS 6346 Hardness
AMS 6346 steel has a hardness of approximately 250 HB. This hardness level makes it suitable for applications requiring high strength, toughness, and resistance to fatigue and wear.
AMS 6346 Heat Treatment
AMS 6346 can be heat treated to improve its strength and durability. The steel can be quenched and tempered to achieve a tensile strength of up to 1150 MPa. Heat treatment also enhances the steel’s resistance to wear and fatigue, making it a popular choice for applications that require long-term durability and stability.
Conclusion:
In conclusion, AMS 6346 material is a low-alloy steel with exceptional mechanical properties, making it a popular choice for applications requiring strength, durability, and resistance to wear and fatigue. Its high strength, toughness, and resistance to corrosion make it ideal for use in aerospace, military, and defence applications and in the oil and gas industry. Heat treatment can further strengthen it to meet specific performance requirements. Understanding the composition, physical and mechanical properties, hardness, and heat treatment of AMS 6346 steel can help manufacturers and engineers determine whether it suits their specific applications.
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.
