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Model No: 4340 VAR Alloy Steel
AMS 6414M / 36CrNiMo4 / 4340 VAR Alloy Steel
AMS 6414M covers 4340 VAR (Vacuum Arc Remelted) alloy steel, a high-strength steel with exceptional toughness and fatigue resistance, making it ideal for applications in aerospace, defense, and heavy-duty industrial sectors.
Delivery :
FOB
minimum order :
50 kilograms
Supply Ability :
5000Tonkilograms / Month
Stock Time :
7-10Day
Country of Origin :
CHINA
Quantity :
AMS 6414M （36CrNiMo4）covers 4340 VAR (Vacuum Arc Remelted) alloy steel, a high-strength steel with exceptional toughness and fatigue resistance, making it ideal for applications in aerospace, defense, and heavy-duty industrial sectors. This specification is for a premium aircraft-quality, low-alloy steel in the form of bars, forgings, mechanical tubing, and forging stock.
Known for its superior cleanliness and reduced impurities due to the vacuum remelting process, 4340 VAR is commonly used in critical components that require enhanced strength and durability.This results in a much cleaner steel meeting the magnetic particle test requirements of AMS-2300. It is a steel of the highest quality with excellent transverse ductility and toughness at high strength levels. It has good shock and impact resistance as well as wear and abrasion resistance in the hardened condition. Standard Aircraft Quality air-melted AMS 6414 Air Melt material is available on request. 4340 ESR, or Electroslag Remelted material is also available on request.
Under AMS 6414M, 4340 VAR alloy steel is highly suitable for parts that must withstand heavy loads, high stresses, and challenging environments. This specification ensures that the alloy meets strict requirements for performance, particularly in structural components where long-term reliability is crucial.
Chemical Composition
| Symbol | Element | Min % | Max % |
|---|---|---|---|
| C | Carbon | 0.38% | 0.43% |
| Mn | Manganese | 0.65% | 0.90% |
| Si | Silicon | 0.15% | 0.35% |
| P | Phosphorus | 0.01% | |
| S | Sulfur | 0.01% | |
| Cr | Chromium | 0.70% | 0.90% |
| Ni | Nickel | 1.65% | 2.00% |
| Mo | Molybdenum | 0.20% | 0.30% |
| Cu | Copper | 0.35% |
Mechanical Properties
| Bar Size | Temperature * | Tensile Strength | Yield Strength | Elongation in 2" | Reduction of Area |
|---|---|---|---|---|---|
| 3.5"Dia. | 400° F (204° C) | 276 ksi | 222 ksi | 11.0% | 35.0% |
| 7.5"Dia. | 500° F (260° C) | 265 ksi | 222 ksi | 8% | 25.0% |
| 10.5"Dia. | 1100° F (593° C) | 165 ksi | 150 ksi | 18% | 60.0% |
* After Normalized 1650°/1700° F, Austenized 1500°/1525° F, Oil quenched
Heat Treatment
| Type | Process |
|---|---|
| Normalize | 1600° - 1700° F (871° – 927° C), then air cool |
| Auestenitize | 1475° – 1575° F (802° – 857° C), then quench in oil |
| Temper | 400° – 1200° F (204° – 649° C) depending on desired strength. For Ultimate Tensile Strength above 260ksi, temper between 400° – 500° F (204° – 260° C) |
Applications
AMS 6414M alloy steel, particularly 4340 VAR in round bar and flat bar forms, is widely used in industries where strength and reliability are critical. Common applications include:
- Aerospace structural components such as landing gear and fasteners
- Transmission and drivetrain parts in high-performance vehicles
- Defense hardware like missile systems and armored vehicles
- Heavy-duty industrial equipment parts and tooling
- Powertrain components exposed to extreme stress
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