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AISI 4140 Alloy Steel Angle Channel is a chromium-molybdenum steel grade known for its exceptional combination of strength, toughness, and hardness. It provides outstanding fatigue resistance and can be heat-treated to achieve a wide range of mechanical properties depending on the application. This alloy is widely used for manufacturing machinery parts, structural components, and tools that demand high performance under stress. Due to its superior hardenability and high tensile strength, AISI 4140 has become one of the most versatile alloy steels available. It performs well in demanding environments and can be used for both static and dynamic load-bearing structures. The material’s excellent balance of mechanical properties makes it suitable for forging, machining, and fabrication applications. Available in various dimensions and finishes, it is an excellent choice for precision engineering and industrial use.
AISI 4140 steel channels and angles are primarily used in sectors where reliability and toughness are essential. These structural shapes are utilized in oil and gas equipment, automotive components, construction machinery, and heavy fabrication projects. Their inherent strength allows them to resist deformation under heavy load conditions, providing long-lasting structural support. AISI 4140 can be heat-treated through quenching and tempering processes to improve mechanical properties and surface hardness. It exhibits good machinability in the annealed condition and maintains its integrity after welding with appropriate preheating and post-weld treatment. The combination of chromium and molybdenum provides strong resistance against oxidation and scaling at elevated temperatures. This makes it ideal for components operating in high-temperature and pressure environments where durability is critical.
The chemical composition of AISI 4140 includes approximately 0.38–0.43% carbon, 0.75–1.00% chromium, 0.15–0.25% molybdenum, and 0.60–0.80% manganese. These elements enhance its strength, toughness, and hardenability, making it highly adaptable to thermal treatments. Carbon contributes to hardness and strength, while chromium enhances corrosion and wear resistance. Molybdenum improves creep strength and high-temperature performance, ensuring stability during long-term use. Manganese assists in deoxidizing the steel and enhances its toughness under impact loading. The controlled alloying ensures a fine-grained microstructure that supports improved fatigue performance. Such composition allows manufacturers to meet a wide range of engineering specifications without compromising on machinability or durability.
Mechanically, AISI 4140 Alloy Steel Angle Channel exhibits a tensile strength ranging from 655 to 950 MPa depending on the heat-treatment condition. It offers a yield strength between 415 and 850 MPa, with elongation percentages of 12–22%. The Brinell hardness typically varies between 197 and 255 HB in the annealed state, but can reach over 500 HB after quenching and tempering. These properties make it an excellent choice for load-bearing applications where high performance is required. Its impact resistance remains high even at subzero temperatures, which ensures structural integrity in outdoor and harsh conditions. The steel can be easily machined to close tolerances, making it ideal for shafts, gears, connecting rods, and tool holders. Additionally, its thermal stability and resistance to wear make it suitable for precision engineering and die-making industries.
AISI 4140 alloy steel channels and angles are available in a wide range of sizes, thicknesses, and surface finishes. Standard supply conditions include hot rolled, normalized, quenched, and tempered forms depending on user requirements. Angles are typically available in equal or unequal leg configurations ranging from 25 mm × 25 mm up to 200 mm × 200 mm. Channels are supplied in C, U, and custom shapes for industrial and construction applications. Lengths generally range from 3 meters to 12 meters, with custom cutting available on request. Each product undergoes strict quality inspection to ensure compliance with international standards such as ASTM A829 and SAE J404. Manufacturers can also offer custom heat treatment, machining, and coating options for specialized applications.
In terms of applications, AISI 4140 Alloy Steel Angle Channel is widely used in the automotive, aerospace, and mechanical engineering sectors. It is commonly employed for producing crankshafts, axles, bolts, couplings, and drive shafts due to its strength and shock resistance. In construction and structural engineering, it serves as a reliable material for supporting heavy frameworks and machinery bases. Its ability to withstand stress and fatigue makes it ideal for bridges, pressure vessels, and mechanical linkages. The material’s weldability and machinability allow engineers to fabricate complex designs without compromising performance. It also finds application in oilfield equipment, mining machinery, and tool manufacturing due to its exceptional toughness. The versatility of AISI 4140 makes it one of the most preferred alloy steels across multiple industries.
Overall, AISI 4140 Alloy Steel Angle Channel represents the perfect combination of strength, durability, and machinability. Its adaptability to different thermal and mechanical conditions makes it suitable for a wide range of industrial purposes. Engineers prefer AISI 4140 for critical load-bearing structures where safety and longevity are priorities. The alloy’s performance under high stress and temperature ensures reliability in challenging working environments. It provides a superior alternative to carbon steels when greater hardness and tensile strength are required. Regular maintenance and appropriate heat treatment can further enhance its lifespan and performance efficiency. Choosing AISI 4140 steel channels and angles ensures long-term stability, precision, and cost-effectiveness in every application.
Specification Table
| Specification | Details |
|---|---|
| Grade | AISI 4140 Alloy Steel |
| Standard | ASTM A29 / A322 / SAE J404 / DIN 1.7225 / EN 42CrMo4 |
| Product Forms | Angle, Channel, Round Bar, Flat Bar, Forged Block, and Custom Profiles |
| Size Range | Angles: 25 mm × 25 mm to 200 mm × 200 mm Channels: 25 mm to 300 mm (width) × up to 12 m (length) |
| Thickness | 3 mm to 25 mm (custom thicknesses on request) |
| Condition | Hot Rolled, Normalized, Annealed, Quenched & Tempered |
| Surface Finish | Black, Bright, Polished, Shot Blasted, or as required |
| Heat Treatment | Annealed / Hardened / Quenched and Tempered (as per requirement) |
| End Finish | Plain End, Beveled End, or Custom Cut Length |
| Country of Origin | Made in India |
| Applications | Automotive parts, Machinery components, Structural frames, Shafts, Tools, Oilfield equipment |
Chemical Composition (Typical ranges for SSIS)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.38 – 0.43 |
| Manganese (Mn) | 0.60 – 0.80 |
| Silicon (Si) | 0.15 – 0.30 |
| Chromium (Cr) | 0.75 – 1.00 |
| Molybdenum (Mo) | 0.15 – 0.25 |
| Phosphorus (P) | ≤ 0.035 |
| Sulphur (S) | ≤ 0.040 |
| Iron (Fe) | Balance |
Mechanical Properties (Typical)
| Property | Metric Value | Imperial Value | Condition |
|---|---|---|---|
| Tensile Strength | 655 – 950 MPa | 95 – 138 ksi | Quenched & Tempered |
| Yield Strength | 415 – 850 MPa | 60 – 123 ksi | Heat Treated |
| Elongation | 12 – 22% | 12 – 22% | In 50 mm gauge length |
| Reduction of Area | 45 – 60% | 45 – 60% | Typical |
| Impact Energy (Charpy V-Notch) | 35 – 45 J | 26 – 33 ft-lb | Normalized |
| Hardness, Brinell (HB) | 197 – 255 HB (Annealed) | 197 – 255 HB | Annealed Condition |
| Hardness, Rockwell C (HRC) | 20 – 55 HRC | 20 – 55 HRC | Quenched & Tempered |
| Modulus of Elasticity | 205 GPa | 29,700 ksi | Room Temperature |
Equivalent Grades
| Standard | Grade | Country / Specification |
|---|---|---|
| AISI / SAE | 4140 | United States |
| ASTM | A29 / A322 Grade 4140 | American Standard |
| UNS | G41400 | Unified Numbering System |
| EN | 42CrMo4 | European Standard |
| DIN | 1.7225 | German Standard |
| BS | 708M40 | British Standard |
| JIS | SCM440 | Japanese Standard |
| GOST | 38HM | Russian Standard |
| ISO | 42CrMo4 | International Standard |
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) | Leg x Leg x Thickness (mm) | Length (m) | Weight (kg/m) | Section Modulus (cm³) | Moment of Inertia (cm⁴) |
|---|---|---|---|---|---|
| 25 x 25 x 3 | 25 × 25 × 3 | 6 | 1.10 | 1.23 | 2.65 |
| 40 x 40 x 4 | 40 × 40 × 4 | 6 | 2.40 | 2.98 | 7.12 |
| 50 x 50 x 5 | 50 × 50 × 5 | 6 | 3.65 | 5.25 | 14.1 |
| 65 x 65 x 6 | 65 × 65 × 6 | 6 | 5.75 | 9.85 | 33.8 |
| 75 x 75 x 8 | 75 × 75 × 8 | 6 | 8.60 | 14.2 | 52.4 |
| 90 x 90 x 10 | 90 × 90 × 10 | 6 | 12.10 | 20.8 | 84.9 |
| 100 x 100 x 12 | 100 × 100 × 12 | 6 | 15.80 | 27.4 | 126.4 |
| 130 x 130 x 12 | 130 × 130 × 12 | 6 | 20.80 | 46.8 | 235.6 |
| 150 x 150 x 15 | 150 × 150 × 15 | 6 | 28.20 | 65.2 | 376.5 |
Types Of AISI 4140 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 4140 Alloy Steel Angle Channel?
AISI 4140 Alloy Steel Angle Channel is a chromium-molybdenum low alloy steel product that offers high tensile strength, toughness, and wear resistance. It is widely used in mechanical, structural, and industrial applications where high performance is essential. This steel type can be heat-treated to achieve excellent hardness and durability for heavy-duty use.
What are the key properties of AISI 4140 Alloy Steel?
AISI 4140 offers high tensile strength (up to 950 MPa), good fatigue resistance, excellent machinability, and strong impact toughness. It performs well in both high- and low-temperature environments, and it can be quenched and tempered for additional hardness. Its chromium and molybdenum content also enhances corrosion and wear resistance.
Where is AISI 4140 Alloy Steel Angle Channel commonly used?
This alloy steel channel is widely used in industries such as automotive, oil & gas, heavy machinery, and construction. Common applications include shafts, gears, axles, bolts, couplings, machine frames, and supporting structures. It’s ideal for components exposed to heavy loads and dynamic stress.
What are the available sizes and thicknesses for AISI 4140 Angle Channel?
AISI 4140 angles and channels are typically available in sizes ranging from 25 mm × 25 mm up to 200 mm × 200 mm, with thicknesses from 3 mm to 25 mm. Standard lengths are 6 meters or 12 meters, but custom cut-to-length options are also available based on client requirements.
Can AISI 4140 Alloy Steel be welded or machined easily?
Yes, AISI 4140 can be machined and welded using proper procedures. Preheating before welding and post-weld heat treatment are recommended to reduce cracking risks. It also offers excellent machinability in the annealed state, allowing precise fabrication for engineering components.
What is the difference between AISI 4140 and AISI 4130 Alloy Steel?
AISI 4140 contains slightly higher carbon and chromium content compared to AISI 4130, which provides better strength and hardness. While both are chromium-molybdenum steels, 4140 is preferred for applications requiring greater load-bearing capacity and wear resistance.
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