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Sae 4340 Alloy Steel Bars / AISI 4340 Round Flat Bars / 4340 Rods / Rings
100.0 INR/Kilograms
Product Details:
- Application Engineering, aerospace, automotive, die, tooling, shafts, axles
- Tolerance H9, H11, H13 or as required
- Diameter 10 mm to 600 mm
- Technique Hot Rolled / Cold Drawn / Forged
- Specific Use High tensile & strength parts, gear components, heavy-duty structural components
- Material SAE 4340 Alloy Steel / AISI 4340
- Processing Machined, Peeled, Turned, Ground
- Click to view more
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Sae 4340 Alloy Steel Bars / AISI 4340 Round Flat Bars / 4340 Rods / Rings Price And Quantity
- 100 Kilograms
- 100.0 INR/Kilograms
Sae 4340 Alloy Steel Bars / AISI 4340 Round Flat Bars / 4340 Rods / Rings Product Specifications
- Hot Rolled / Cold Drawn / Forged
- Machined, Peeled, Turned, Ground
- ASTM, AISI, SAE, EN, DIN, JIS
- SAE 4340 Alloy Steel / AISI 4340
- H9, H11, H13 or as required
- Engineering, aerospace, automotive, die, tooling, shafts, axles
- 10 mm to 600 mm
- High tensile & strength parts, gear components, heavy-duty structural components
- Round Bars, Flat Bars, Rods, Forged Rings
- Black, Bright, Peeled, Polished
- 4340
- 100 mm to 6000 mm (custom length available)
- Moderate (not stainless, needs coating for best performance)
- Nickel, Chromium, Molybdenum
- 930 MPa min (varies as per heat treatment)
- Smooth, Scale-Free
- 16% min
- 7.85 g/cm3
- 28-34 HRC (Annealed), may be heat treated
- 785 MPa min (can vary by treatment)
- As rolled / As forged / Heat treated
- > 35 Joules (at -20C)
- Round, Flat, Square, Forged Rings
- Normalized, Annealed, Quenched & Tempered
Product Description
AISI 4340 is a Nickel-Chromium-Molybdenum alloy steel known for its superior toughness and high strength in the heat-treated condition. It is a highly sought-after grade for applications where high fatigue strength and deep hardenability are required, as it maintains its mechanical properties even in large sections.
Key Specifications & Properties
| Feature | Details |
| Standard | ASTM A29 / SAE J404 |
| Material Type | Ni-Cr-Mo (Nickel-Chromium-Molybdenum) Steel |
| Chemical Composition | Nickel (1.65% 2.00%), Chromium (0.70% 0.90%), Molybdenum (0.20% 0.30%) |
| Tensile Strength | $900 - 1200 text{ MPa}$ (Quenched & Tempered) |
| Yield Strength | $ge 850 text{ MPa}$ |
| Hardness (Typical) | $217 - 248 text{ HBW}$ (Annealed) |
Common Applications
Because of its extreme durability and strength, 4340 round bars and rings are used in:
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Aerospace: Landing gear components, structural airframe parts, and engine mounts.
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Oil & Gas: High-strength drill collars, tool joints, and heavy-duty shafting.
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Automotive: Heavy-duty crankshafts, axles, steering knuckles, and transmission gears.
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General Engineering: High-tensile bolts, forged rings, and power transmission components.
Features to Highlight in Your Listing
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Deep Hardenability: The nickel content ensures uniform strength and hardness through the entire thickness of the bar or ring.
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Exceptional Fatigue Resistance: Ideal for parts subjected to high-stress cycles and heavy impact.
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Excellent Ductility: Offers a rare combination of high strength and good ductility at low temperatures.
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Versatile Forms: Available as Round Bars, Flat Bars, and Seamless Rolled Rings.
Exceptional Mechanical Strength
SAE 4340 Alloy Steel Bars are engineered for demanding environments that require high strength and durability. The alloy's impressive yield and tensile strength, combined with good elongation and impact values, make it a preferred choice for critical load-bearing applications in engineering, aerospace, and automotive sectors.
Versatile Applications and Custom Shapes
Available in round, flat, and square bars, as well as forged rings, SAE 4340 adapts to a variety of uses. It suits everything from gears and shafts to structural parts. Manufacturers can provide custom lengths, tolerances (H9, H11, H13), and finishing options, ensuring the right fit for specialized components or mass production.
Tailored Heat Treatment and Surface Quality
These steel bars can be supplied in as-rolled, as-forged, or heat-treated conditions. Customers may choose smooth, scale-free surfaces or opt for additional finishes like peeling, polishing, or grinding to optimize the product for machining or end-use performance. Heat treatment further enhances mechanical traits for specific applications.
FAQ's of Sae 4340 Alloy Steel Bars / AISI 4340 Round Flat Bars / 4340 Rods / Rings:
Q: How is SAE 4340 Alloy Steel typically heat treated for optimal properties?
A: SAE 4340 Alloy Steel can be normalized, annealed, or quenched and tempered, depending on the application. Heat treatment processes are selected to achieve targeted levels of hardness, tensile strength, and toughness required for high-performance components such as gears and shafts.Q: What are the primary applications for AISI 4340 round bars and rods?
A: AISI 4340 bars and rods are widely used in manufacturing engineering parts exposed to heavy loads and stress. Common applications include high-strength gears, shafts, axles, die and tooling components, as well as critical aerospace and automotive structural elements.Q: When should I choose a specific surface condition or finish for 4340 steel bars?
A: The appropriate surface finish-smooth, scale-free, black, bright, peeled, or polished-depends on the end use. For machining or visible applications, peeled or polished bars offer enhanced aesthetics and precision. For general structural use, black or as-rolled finishes may be sufficient.Q: Where can SAE 4340 Alloy Steel bars be sourced in India?
A: SAE 4340 Alloy Steel bars are available across India from various producers, manufacturers, suppliers, traders, and exporters who cater to domestic and international engineering, automotive, and aerospace industries.Q: What is the process for customizing diameter, length, or tolerance for 4340 round bars?
A: Customization is possible via hot rolling, cold drawing, or forging, followed by machining or grinding to achieve required diameters (10 mm to 600 mm), lengths (up to 6000 mm), and specific tolerances (H9, H11, H13). Discuss your precise requirements with the steel supplier or manufacturer.Q: How does the alloy composition of 4340 steel influence its performance?
A: The addition of nickel, chromium, and molybdenum in 4340 steel enhances its hardenability, strength, and toughness. This makes it suitable for high-tensile applications and ensures consistent performance even after heat treatment processes.Q: What are the key benefits of using SAE 4340 for high-stress engineering parts?
A: SAE 4340 offers a balanced combination of high strength, ductility, impact resistance, and fatigue performance. These features enable its use in components subject to extreme loads and dynamic stresses, which is vital in sectors like aerospace, automotive, and heavy engineering.Tell us about your requirement
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