Chrome Moly SAE AISI 4130 Alloy Steel Bars

Chrome Moly SAE AISI 4130 Alloy Steel Bars

95.0 INR/Kilograms

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Product Details:

Type Round Bar
Processing Quenched and Tempered, Normalized, Annealed
Tolerance H9, H10, H11 or as specified
Material Chrome Moly SAE AISI 4130 Alloy Steel
Grade 4130
Length 2 to 6 meters or as required
Technique Hot Rolled / Forged
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Chrome Moly SAE AISI 4130 Alloy Steel Bars Price And Quantity

Minimum Order Quantity 1000 Kilograms
Price 95.0 INR/Kilograms

Chrome Moly SAE AISI 4130 Alloy Steel Bars Product Specifications

Tolerance H9, H10, H11 or as specified
Processing Quenched and Tempered, Normalized, Annealed
Type Round Bar
Grade 4130
Material Chrome Moly SAE AISI 4130 Alloy Steel
Technique Hot Rolled / Forged
Length 2 to 6 meters or as required
Application Aerospace, Oil and Gas, Automotive, Structural, Mechanical Parts
Specific Use High strength components, welded structures, shafts, machine parts
Standard ASTM A29/A29M, AISI 4130, SAE J404
Diameter 10 mm to 300 mm
Finish Bright, Polished, Black, Peeled

Heat Treatment Suitable for quenching and tempering
Machinability Good
Impact Strength High, suitable for critical applications
Surface Condition Free from cracks, scales, and other surface defects
Elongation 20% minimum in 50mm
Hardness Hardness typically 200-250 HB (annealed)
Density 7.85 g/cm3
Section Shape Round
Tensile Strength 560-670 MPa (as rolled/normalized)
Yield Strength 460 MPa minimum (as rolled/normalized)
Weldability Excellent, pre and post weld heat treatment recommended

Product Description

SAE AISI 4130 is perhaps the most famous and widely used "Chrome-Moly" alloy steel in the world. Unlike the high-heat pressure vessel grades weve discussed (like 1.7380 or F9), 4130 is a structural grade prized for its exceptional strength-to-weight ratio and versatility.

1. Key Characteristics

High Strength-to-Weight Ratio: Allows for thinner, lighter components without sacrificing structural integrity.
Toughness: Excellent fatigue strength and impact resistance.
Weldability: Unlike many high-alloy steels, 4130 is easily weldable (via TIG or MIG) because of its lower carbon content, making it a favorite for frame builders.
Hardenability: It responds excellently to heat treatment (Quench and Temper) to reach very high strength levels.

2. Chemical Composition (%)

The "41" indicates it is a Chromium-Molybdenum steel, and "30" indicates a nominal carbon content of 0.30%.

Element	Carbon (C)	Manganese (Mn)	Chromium (Cr)	Molybdenum (Mo)	Silicon (Si)
Value	0.28 0.33	0.40 0.60	0.80 1.10	0.15 0.25	0.15 0.35

3. Mechanical Properties

Properties vary significantly depending on the heat treatment. Below are typical values for Normalized 4130:

Tensile Strength: 97,000 psi (670 MPa)
Yield Strength: 63,000 psi (435 MPa)
Elongation: 25% (in 50mm)
Hardness: 200 HBW (approx. 90-95 Rockwell B)

Note: When Quenched and Tempered, the Tensile Strength can exceed 150,000 psi.

4. Common Forms of 4130 Bars

Round Bars: Used for shafts, pins, and heavy-duty bolts.
Hex Bars: Common for specialized fasteners.
Conditions: * Normalized: Most common; offers a good balance of strength and ductility.
- Annealed: Softest state; best for heavy machining.
- Quenched & Tempered (Q&T): Maximum strength; ready for high-load applications.

5. Primary Applications

If 1.7380 is for power plants, 4130 is for motion and impact:

Aerospace: Engine mounts, welded tubing frames, and structural supports.
Motorsports: Roll cages, suspension components, and chassis for race cars/mountain bikes.
Oil & Gas: "Mud motors," tool joints, and drill collars (often specified under API 6A).
Machine Tools: Arbors, spindles, and chucks.

6. Welding and Fabrication Tips

Preheating: For thin-walled tubing (under 3mm), preheating is often not required. For thick round bars, preheating to 150C200C is recommended to prevent hydrogen cracking.
Filler Metal: ER80S-D2 is the standard filler wire used to match the strength and properties of 4130.
Machinability: In the annealed state, it has a machinability rating of about 70% (relative to 1212 carbon steel). It machines cleanly but requires more power than standard low-carbon steels.

4130 vs. 4140: Which do you need?

4130: Better for welding and structural frames (Lower carbon).
4140: Better for high-strength machinery parts and wear resistance (Higher carbon, but harder to weld).

Exceptional Mechanical Performance

SAE AISI 4130 alloy steel bars deliver a reliable combination of high impact strength, toughness, and ductility. The 4130 grade exhibits outstanding yield and tensile strength, with elongation suitable for engineering applications that demand superior mechanical properties under stress. This makes them ideal for critical engineering components and welded structures requiring both durability and resilience.

Versatility in Processing and Applications

These alloy steel round bars can be processed through quenching, tempering, normalization, or annealing to achieve specific mechanical attributes. With excellent machinability and weldability-when correct heat treatments are applied-they find extensive use in aerospace, automotive, oil and gas, and structural mechanical parts. The bright, polished, black, and peeled finishes suit diverse application requirements and enhance their performance in various environments.

FAQ's of Chrome Moly SAE AISI 4130 Alloy Steel Bars:

Q: How is Chrome Moly SAE AISI 4130 Alloy Steel Bar processed to achieve its mechanical properties?

A: The 4130 steel bar achieves its mechanical properties through heat treatments such as quenching, tempering, normalization, or annealing. These processes enhance hardness, strength, and toughness, making the material suitable for critical engineering and structural applications.

Q: What industries commonly use SAE AISI 4130 Alloy Steel Bars, and why?

A: Industries such as aerospace, oil and gas, automotive, and mechanical engineering use 4130 alloy steel bars due to their high strength, good machinability, and excellent weldability. These features are especially valued in high-strength components and welded structures.

Q: When is pre and post weld heat treatment recommended for 4130 steel bars?

A: Pre and post weld heat treatment is recommended for 4130 steel bars during fabrication to alleviate residual stresses and maintain toughness at the weld joint. This practice enhances weld integrity, particularly in critical applications or where high structural reliability is required.

Q: Where can the Chrome Moly SAE AISI 4130 Alloy Steel Bars be sourced from in India?

A: These steel bars are available across India through authorized dealers, exporters, fabricators, manufacturers, producers, retailers, suppliers, and traders specializing in alloy steel products, offering various sizes, finishes, and lengths as needed for industrial use.

Q: How does the surface condition of 4130 alloy steel bars contribute to their usage?

A: The bars are manufactured to be free from cracks, scales, and surface defects, ensuring high durability and reducing the risk of failure in service. Their polished, bright, black, or peeled finishes enhance corrosion resistance, making them suitable for demanding environments.

Q: What are the benefits of using AISI 4130 alloy steel bars for high-strength components?

A: Using 4130 alloy steel provides benefits such as high strength-to-weight ratio, excellent impact resistance, and adaptability to various heat treatments and machining processes, ensuring reliable performance in safety-critical and high-stress environments.

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