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SAE AISI 8640 Alloy Steel Bars 8640 Round Bar 8640 Rods
70.0 INR/Kilograms
Product Details:
- Processing Forged, Rolled, Annealed, Heat Treated
- Standard ASTM A29, DIN 1.6527, JIS SNCM 439
- Technique Hot Rolled, Cold Drawn
- Finish Bright, Black, Peeled, Turned or Polished
- Length 2m to 6m or as per requirement
- Grade 8640
- Diameter 6 mm to 350 mm
- Click to view more
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SAE AISI 8640 Alloy Steel Bars 8640 Round Bar 8640 Rods Price And Quantity
- 70.0 INR/Kilograms
- 1 Kilograms
SAE AISI 8640 Alloy Steel Bars 8640 Round Bar 8640 Rods Product Specifications
- Bright, Black, Peeled, Turned or Polished
- 2m to 6m or as per requirement
- Hot Rolled, Cold Drawn
- ASTM A29, DIN 1.6527, JIS SNCM 439
- Forged, Rolled, Annealed, Heat Treated
- SAE AISI 8640 Alloy Steel
- H9, H10, H11, or as specified
- Automotive Components, Shafts, Gears, Forged Parts
- Engineering, Construction, Machinery Manufacturing
- Round Bar, Rods
- 6 mm to 350 mm
- 8640
- 1 Ton
- Up to 250 HBW (as per heat treatment)
- 7.85 g/cm3
- 11-15% (as heat treated)
- Moderate, generally not used in corrosive environments
- Annealed, Normalized, Quenched and Tempered
- Straight Length, Cut Length as required
- 550-950 MPa (as heat treated)
- Standard export seaworthy packing or as requested
- 850-1150 MPa (as heat treated)
- Good
Product Description
AISI 8640 is a low-alloy, medium-carbon nickel-chromium-molybdenum steel (often referred to as a "triple-alloy" steel). It is widely known for its excellent balance of strength, toughness, and wear resistance when heat-treated. Because it contains a moderate amount of carbon, it response incredibly well to quenching and tempering.
Here is a comprehensive breakdown of SAE AISI 8640 round bars and rods, covering their chemical makeup, mechanical properties, and typical industrial applications.
1. Chemical Composition
The "triple-alloy" design relies on a precise mix of nickel, chromium, and molybdenum to enhance hardenability and fatigue strength over standard carbon steels.
| Element | Weight Percentage (%) |
| Carbon (C) | 0.38% -0.43% |
| Chromium (Cr) | 0.40% - 0.60% |
| Nickel (Ni) | 0.40% - 0.70% |
| Molybdenum (Mo) | 0.15% -0.25% |
| Manganese (Mn) | 0.75% - 1.00% |
| Silicon (Si) | 0.15% - 0.35% |
| Phosphorus (P) | 0.035% |
| Sulfur (S) | 0.040% |
2. Key Mechanical Properties (Typical)
Note: Exact properties depend heavily on the heat-treatment condition (e.g., annealed vs. quenched and tempered).
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Tensile Strength: 650 to 950 MPa (approx. 94,000 - 138,000 psi) depending on tempering temperature.
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Yield Strength: 415 to 700 MPa (approx. 60,000 -101,000 psi).
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Elongation at Break: 15% - 22% (in 50 mm).
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Hardness: Typically ranges from 200 to 300 HBW (Brinell) in commercial supply conditions, but can be hardened significantly higher via direct quenching.
3. Global Equivalents
If you are sourcing or cross-referencing material across international standards, AISI 8640 corresponds closely to:
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UNS: G86400
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DIN / WNr: 1.6546 (specifically matching the core Ni-Cr-Mo chemistry)
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EN / BS: 817M40 / En24 (Note: En24 has slightly higher alloy content but serves similar high-strength rod applications)
4. Supply Configurations for Round Bars & Rods
8640 round bars are typically manufactured and ordered in the following finishes and conditions:
Delivery States
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As Rolled / Forged: Hot-rolled or hot-forged bars, usually requiring subsequent machining or heat treatment.
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Annealed: Softened for optimal machinability.
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QT (Quenched & Tempered): Pre-hardened to a specific tensile range so components can be used immediately after final machining.
Surface Finishes
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Black Bar: As-rolled surface with tight mill scale.
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Peeled / Turned: Outer scale removed, offering better concentricity and diameter tolerances.
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Cold Drawn / Centerless Ground: Highly precise dimensional tolerances and smooth surface finish, ideal for automatic lathe machining into fasteners or small shafts.
5. Common Applications
Because of its deep hardenability and resistance to shock loading, 8640 rods and round bars are standard choices for heavy-duty mechanical engineering components:
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Fasteners & Clamping: High-tensile bolts, studs, heavy-duty J-bolts, connecting rod bolts, and specialized clamping hardware.
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Drivetrain Components: Gears, pinions, splined shafts, axles, and crankshafts.
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Machine Construction: Piston rods, guide rods, knuckles, and high-stress structural pins.
Versatile Steel for Demanding Applications
SAE AISI 8640 Alloy Steel Bars are designed to meet the rigorous demands of engineering, construction, and machinery manufacturing. This material offers excellent mechanical properties and consistent quality for use in automotive components, gears, shafts, and other critical parts. Its versatile supply forms and range of dimensions allow tailoring to your project's exact requirements.
High-Performance Mechanical Properties
With surface hardness levels up to 250 HBW (subject to heat treatment) and impressive yield and tensile strengths, 8640 alloy steel provides robust performance in high-load applications. Its good machinability and range of available processing techniques, such as forging, rolling, annealing, and heat treating, ensure optimal fabrication outcomes and component reliability.
FAQ's of SAE AISI 8640 Alloy Steel Bars 8640 Round Bar 8640 Rods:
Q: How are SAE AISI 8640 Alloy Steel Bars typically delivered?
A: SAE AISI 8640 Alloy Steel Bars are shipped in annealed, normalized, quenched, or tempered conditions, depending on the application requirements. They can be supplied as straight lengths or cut to your required dimensions, generally ranging from 2m to 6m. Standard export seaworthy packaging or custom packing options are available upon request.Q: What benefits does 8640 alloy steel offer for engineering applications?
A: 8640 alloy steel offers a combination of good strength, toughness, and machinability. It features yield strengths between 550-950 MPa and tensile strengths up to 1150 MPa after heat treatment, making it ideal for shafts, gears, automotive parts, and forged components subjected to significant stress and wear.Q: Where are SAE AISI 8640 Round Bars commonly used?
A: These bars are widely used in engineering, automotive manufacturing, construction, and machinery production. Typical applications include making automotive shafts, gears, and other forged or machined components that require excellent mechanical properties and consistent quality.Q: What is the standard order quantity and available size range for 8640 bars?
A: The minimum order quantity for SAE AISI 8640 Alloy Steel Bars is 1 ton. Diameters are available from 6 mm to 350 mm, with lengths typically between 2 m and 6 m. Custom cut lengths and tolerances (H9, H10, H11) can also be accommodated as specified.Q: How is SAE AISI 8640 Alloy Steel processed to achieve its properties?
A: 8640 alloy steel can be processed by hot rolling, cold drawing, forging, and heat treating (annealing, normalizing, quenching, tempering) to achieve the required mechanical properties and hardness. Finishes such as bright, black, peeled, turned, or polished are also available to meet different project needs.Q: What is the corrosion resistance level of 8640 steel, and are there precautions for use?
A: SAE AISI 8640 Alloy Steel offers moderate corrosion resistance and is generally not intended for corrosive environments. It is best suited for applications in dry or lightly corrosive conditions, and additional protective coatings may be recommended for enhanced durability in aggressive settings.Tell us about your requirement
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