Subscribe to our Newsletter
Model No: 300M (4340 MOD)
AMS 6417 / AMS 6419/ UNS K44220 / 300M (4340 MOD) Alloy Steel
Alloy 4340 MOD (Modified) is a high-strength, low-alloy steel known for its toughness and heat treatment capabilities. It is typically used in applications where high strength and toughness are required, along with good fatigue resistance.
Delivery :
FOB
minimum order :
100 kilograms
Supply Ability :
5000Tonkilograms / Month
Stock Time :
7-10Day
Country of Origin :
CHINA
Quantity :
Alloy 4340 MOD (Modified) is a high-strength, low-alloy steel known for its toughness and heat treatment capabilities. It is typically used in applications where high strength and toughness are required, along with good fatigue resistance. Carbon Content in AMS 6417 Carbon content is 0.37% to 0.43”. Specifications AMS 6419 requires 0.40” – 0.45% C and AMS 6256 0.40% - 0.44%C. Service Steel Aerospace stocks material with restricted carbon content to certify chemistry to these various specifications.
300M (4340 Mod) Chemical Composition
| Symbol | Element | Min % | Max % |
|---|---|---|---|
| C | Carbon | 0.38% | 0.43% |
| Mn | Manganese | 0.65%% | 0.90% |
| Si | Silicon | 1.45% | 1.80% |
| P | Phosphorus | 0.010% | |
| S | Sulfur | 0.008% | |
| Cr | Chromium | 0.70% | 0.95% |
| Ni | Nickel | 1.65% | 2.00% |
| Mo | Molybdenum | 0.30% | 0.50% |
| V | Vanadium | 0.05% | 0.10% |
| Cu | Copper | 0.35% |
Carbon Content Note:
Both AMS 6257 and AMS 6419 require minimum 0.40% Carbon content
SSA material is stocked with minimum 0.40% Carbon content to meet multiple specifications
AMS 6417 Macrostructure standards
| Class | Condition | Severity |
|---|---|---|
| 1 | Freckles | A |
| 2 | White Spots | A |
| 3 | Radial Segregation | B |
| 4 | Ring Pattern | B |
Minimum Longitudinal Tensile Properties per AMS 6417
| Property | Value |
|---|---|
| Tensile Strength | 270 ksi |
| Yield Strength 0.2% offset | 220 ksi |
| Elongation | 8% |
| Reduction of Area | 30% |
After heat treating specimens per paragraph 3.4.4
300M (4340 Mod) Alloy Steel Applications
- Aerospace and Aircraft Components: Alloy 4340 MOD is used in aerospace applications due to its high strength-to-weight ratio, toughness, and ability to withstand high stresses. It can be found in components such as landing gear, engine parts, gears, and structural elements of aircraft.
- Oil and Gas Industry: In the oil and gas sector, Alloy 4340 MOD is used for components that require high strength, toughness, and resistance to fatigue and corrosion. It is used in downhole drilling tools, wellhead components, and shafts.
- Automotive and Racing Industry: Alloy 4340 MOD is used in high-performance automotive applications where strength, durability, and fatigue resistance are critical. It can be found in crankshafts, connecting rods, gears, and other engine components.
- Defense and Military Equipment: Due to its toughness and strength properties, Alloy 4340 MOD is used in the defense industry for applications such as armor plates, vehicle components, and military vehicle suspension systems.
- Industrial Equipment: Alloy 4340 MOD is utilized in various industrial equipment and machinery where high strength and durability are required. It can be found in gears, shafts, fasteners, and other critical components.
- Tooling and Die Making: In tool and die manufacturing, Alloy 4340 MOD is used for making dies, molds, and tooling that require high strength and toughness to withstand the stresses of forming and shaping operations.
- Marine Applications: In marine environments, Alloy 4340 MOD is used for components such as shafts, propeller shafts, and other critical marine equipment that require high strength, toughness, and resistance to corrosion.
Overall, Alloy 4340 MOD is chosen for its excellent mechanical properties after heat treatment, including high tensile strength, good ductility, and impact resistance. Its versatility and performance characteristics make it suitable for a wide range of demanding applications across multiple industries.
