40CrNiMoA AISI 4340 AMS 6415 Round Hollow Bar Alloy Seamless Steel Pipe For Mechanical
40CrNiMoA AISI 4340 AMS 6415 Round Hollow Bar Alloy Seamless Steel Pipe For Mechanical
Material
40CrNiMoA, also known as AISI 4340 or AMS 6415, is a high-strength, low-alloy steel known for its toughness and ability to withstand high stress. This steel is commonly used in the production of round hollow bars and seamless steel pipes, which are essential components in various mechanical applications.
Specification
The 40CrNiMoA alloy is characterized by its excellent mechanical properties, making it suitable for demanding applications. It is typically supplied in a quenched and tempered condition, which enhances its strength and toughness.
Key Features
- High Strength: Offers excellent tensile and yield strength.
- Toughness: Maintains toughness even at low temperatures.
- Wear Resistance: Good resistance to wear and fatigue.
- Machinability: Can be machined with relative ease.
- Weldability: Can be welded with appropriate techniques.
Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.38 - 0.43 |
| Silicon (Si) | 0.17 - 0.37 |
| Manganese (Mn) | 0.50 - 0.80 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.035 |
| Chromium (Cr) | 0.70 - 0.90 |
| Nickel (Ni) | 1.65 - 2.00 |
| Molybdenum (Mo) | 0.20 - 0.30 |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 930 - 1080 MPa |
| Yield Strength | ≥ 835 MPa |
| Elongation | ≥ 12% |
| Reduction of Area | ≥ 50% |
| Impact Toughness | ≥ 63 J |
Similar Standards and Steel Grades
- ASTM: AISI 4340
- EN: 34CrNiMo6
- GOST: 36ChN3MFA
- JIS: SNCM439
- GB: 40CrNiMoA
Application
The 40CrNiMoA alloy is widely used in various industries due to its robust mechanical properties. Common applications include:
- Automotive: Manufacturing of crankshafts, gears, and axles.
- Aerospace: Components requiring high strength and toughness.
- Oil and Gas: Drill collars and other high-stress components.
- Construction: Heavy-duty machinery and equipment.
- Military: Armored vehicles and other defense applications.
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