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AISI 4340 Alloy Steel Angle Channel is a high-strength, low-alloy steel grade known for its excellent toughness, superior fatigue strength, and outstanding wear resistance. This steel is composed primarily of nickel, chromium, and molybdenum, providing a unique combination of hardness and ductility. The material is widely used in critical structural and mechanical applications where superior performance under stress and high load conditions is required. Industries such as aerospace, automotive, oil & gas, and heavy machinery rely heavily on AISI 4340 steel for its consistent mechanical integrity.
The AISI 4340 Alloy Steel Angle Channel offers exceptional versatility due to its high hardenability and impact strength, even in larger cross-sections. It is often heat-treated through processes like quenching and tempering to achieve precise mechanical properties as per application needs. The chromium and molybdenum elements enhance resistance against wear, while nickel provides superior toughness and deep hardenability. This balance of properties makes AISI 4340 one of the most trusted alloy steels for high-stress components, shafts, and heavy-duty structural frameworks.
When manufactured in angle or channel forms, AISI 4340 alloy steel exhibits remarkable dimensional stability and mechanical strength. The angle and channel profiles are ideal for load-bearing frameworks, reinforcement structures, and machine supports. Due to its excellent machinability in both annealed and heat-treated conditions, fabrication and welding operations can be conducted with precision. Furthermore, surface finishing, polishing, and coating are easily achievable, ensuring durability even in aggressive or corrosive environments.
AISI 4340 Alloy Steel Angle Channels are commonly used in industries requiring high tensile and yield strength with good fatigue resistance. Applications include aircraft landing gears, automotive drive shafts, connecting rods, transmission gears, and other critical components subjected to high torque and pressure. Structural engineers prefer 4340 alloy steel channels due to their exceptional rigidity and reliability, particularly where a combination of toughness, hardness, and ductility is crucial. The steel’s ability to retain strength at elevated temperatures also enhances its performance in demanding industrial settings.
In construction and fabrication, AISI 4340 Alloy Steel Angle Channels are employed in frameworks that must sustain dynamic loads and vibration. The precise chemical composition ensures uniform mechanical behavior throughout the cross-section, reducing the risk of failure or fatigue cracks. The steel’s uniform grain structure and refined metallurgy contribute to long service life and reduced maintenance costs. With proper heat treatment, it achieves a fine balance of tensile strength and elasticity, ensuring adaptability across multiple industrial sectors.
Another key advantage of AISI 4340 Alloy Steel Channel is its superior weldability and formability compared to other alloy steels in its category. It can be welded using suitable preheating and post-weld heat treatment methods to avoid cracking and maintain mechanical integrity. The steel also demonstrates high resistance to shock loads, torsional stress, and bending forces, making it a preferred material for load-bearing beams and heavy-duty frames. Engineers value its dependable toughness and long-lasting performance under extreme service conditions.
Overall, AISI 4340 Alloy Steel Angle Channel represents a perfect blend of strength, toughness, and wear resistance, meeting the needs of modern engineering design. Its versatility extends from precision-machined automotive parts to massive structural frameworks in heavy industries. The combination of nickel, chromium, and molybdenum ensures resilience in harsh environments, maintaining stability and mechanical reliability. Whether in manufacturing, aerospace, or infrastructure applications, AISI 4340 channels and angles stand as a benchmark for durability and performance.
Specification Table
| Specification | Details |
|---|---|
| Standard | AISI, ASTM A829, SAE J404 |
| Grade | AISI 4340 / UNS G43400 |
| Product Forms | Angle, Channel, Flat, Round Bar, Forged Block |
| Size Range | 20 mm × 20 mm to 200 mm × 200 mm (Angle) / Custom Sizes Available |
| Surface Finish | Black, Bright, Polished, Hot Rolled, Cold Drawn |
| Heat Treatment | Annealed, Normalized, Quenched & Tempered |
| Delivery Condition | Hot Rolled, Heat Treated, or as per Customer Requirement |
| Manufacturing Process | Hot Rolled / Forged / Machined / Precision Cut |
| Applications | Automotive Components, Gears, Shafts, Aircraft Parts, Heavy Machinery |
Chemical Composition (Typical ranges for SSIS)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.38 – 0.43 |
| Manganese (Mn) | 0.60 – 0.80 |
| Silicon (Si) | 0.15 – 0.35 |
| Chromium (Cr) | 0.70 – 0.90 |
| Nickel (Ni) | 1.65 – 2.00 |
| Molybdenum (Mo) | 0.20 – 0.30 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.040 |
Mechanical Properties (Typical)
| Property | Metric | Imperial |
|---|---|---|
| Tensile Strength, Ultimate | 930 – 1080 MPa | 135,000 – 157,000 psi |
| Yield Strength | 740 – 850 MPa | 107,000 – 123,000 psi |
| Elongation at Break (in 50 mm) | 17 – 20% | 17 – 20% |
| Reduction of Area | 45 – 50% | 45 – 50% |
| Hardness, Brinell (HB) | 217 – 255 HB | 217 – 255 HB |
| Impact Strength (Charpy V-Notch) | 63 J | 46 ft-lb |
| Modulus of Elasticity | 205 GPa | 29,700 ksi |
| Poisson’s Ratio | 0.27 – 0.30 | 0.27 – 0.30 |
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| USA (AISI / SAE) | AISI 4340 / SAE 4340 |
| UNS | G43400 |
| Europe (EN) | 34CrNiMo6 |
| Germany (DIN) | 1.6582 |
| Britain (BS) | EN24 |
| France (AFNOR) | 35NCD6 |
| Japan (JIS) | SNCM439 |
| China (GB) | 40CrNiMoA |
| Russia (GOST) | 40KHN2MA |
Dimension & Weight Chart (Selected common sizes)
Below is a representative chart showing outside diameter, wall thickness, inside diameter, cross-sectional area of metal and calculated weight per metre (kg/m). Values are calculated using density = 7.93 g/cm³ and are for guidance — use actual MTC values for procurement & engineering.
| Size (mm) | Thickness (mm) | Weight (kg/m) | Sectional Area (cm²) |
|---|---|---|---|
| 25 × 25 | 3 | 1.12 | 1.43 |
| 40 × 40 | 4 | 2.35 | 2.99 |
| 50 × 50 | 5 | 3.65 | 4.65 |
| 65 × 65 | 6 | 5.45 | 6.94 |
| 75 × 75 | 6 | 6.20 | 7.89 |
| 90 × 90 | 8 | 9.80 | 12.48 |
| 100 × 100 | 8 | 10.90 | 13.89 |
| 130 × 130 | 10 | 17.00 | 21.63 |
| 150 × 150 | 12 | 23.90 | 30.35 |
| 200 × 200 | 12 | 32.00 | 40.77 |
Types Of AISI 4340 Alloy Steel Angle & Channel
Stainless Steel Angle & Channel
Monel 400 Angle & Channel
Inconel 600 Angle & Channel
Hastelloy Angle & Channel
Super Duplex Angle & Channel
Duplex Angle & Channel
Nickel Angle & Channel
Monel K500 Angle & Channel
Frequently Asked Questions (FAQ)
What is AISI 4340 Alloy Steel Angle Channel?
AISI 4340 Alloy Steel Angle Channel is a high-strength, nickel-chromium-molybdenum steel product designed for demanding structural and mechanical applications. It offers excellent toughness, wear resistance, and fatigue strength, making it ideal for heavy-duty and high-stress environments.
What are the main advantages of using AISI 4340 Alloy Steel?
The main advantages include superior toughness, high tensile and yield strength, excellent fatigue resistance, and good ductility. It also maintains strength at elevated temperatures and has good machinability and heat treatment response.
Where is AISI 4340 Alloy Steel Angle Channel commonly used?
This material is widely used in aerospace, automotive, oil & gas, power generation, and heavy machinery industries. Typical applications include shafts, gears, axles, aircraft landing gear, and structural frameworks that require high load-bearing capacity.
Can AISI 4340 Alloy Steel Angle Channel be welded?
Yes, AISI 4340 steel can be welded using proper preheating and post-weld heat treatment to prevent cracking. It is essential to control temperature and select suitable filler materials to maintain structural integrity after welding.
What heat treatments can be applied to AISI 4340 Alloy Steel?
Common heat treatments include annealing, normalizing, quenching, and tempering. These processes help achieve the desired mechanical properties such as improved hardness, strength, and toughness depending on the end-use requirements.
Is AISI 4340 Alloy Steel Angle Channel corrosion resistant?
While AISI 4340 offers moderate corrosion resistance, it is not a stainless steel. To enhance corrosion resistance, protective coatings or surface treatments like galvanizing, painting, or plating are often applied.
What are the available sizes and forms of AISI 4340 Alloy Steel Channel?
AISI 4340 channels and angles are available in a range of sizes from 20 mm × 20 mm up to 200 mm × 200 mm, with thicknesses from 3 mm to 12 mm or more. Custom sizes and surface finishes such as black, bright, or polished are available on request.
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