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AISI 4140 Steel Supplier in India | Your Partner for High-Strength Alloy Steel
Introduction to AISI 4140 Steel
AISI 4140 steel is a popular and versatile chromium-molybdenum alloy steel widely recognized for its excellent balance of high tensile strength, toughness, and fatigue resistance. It is a medium carbon steel that can be heat-treated to achieve a wide range of hardness and strength properties, making it a workhorse in various engineering and structural applications. At Jupiter Steels, based in Delhi, we are a trusted stockist and supplier of AISI 4140 steel, providing certified material to customers throughout India, including key industrial regions like Manesar, Haryana, and beyond.
Chemical Composition of AISI 4140 Steel
The reliable performance of 4140 steel is a direct result of its carefully controlled chemical composition. The key alloying elements and their typical weight percentages are:
- Carbon (C): 0.38 – 0.43%
- Chromium (Cr): 0.80 – 1.10%
- Manganese (Mn): 0.75 – 1.00%
- Molybdenum (Mo): 0.15 – 0.25%
- Silicon (Si): 0.15 – 0.30%
Functioning and Reasoning of Chemical Elements
- Chromium (Cr) & Molybdenum (Mo): This combination is the core of AISI 4140 steel. Chromium enhances the steel’s hardenability and corrosion resistance. Molybdenum adds to its strength, toughness, and resistance to wear. Together, these elements give the steel the ability to be hardened uniformly through large sections.
- Manganese (Mn): Manganese increases the steel’s hardenability and tensile strength. It also helps to prevent hot shortness during hot working, ensuring the material can be easily formed.
Hardness, Properties, and Applications of 4140
Hardness
In its normalized or as-rolled condition, AISI 4140 steel typically has a hardness of around 217 HB. It can be hardened and tempered to achieve a working hardness in the range of 28-32 HRC, or even higher depending on the application.
Properties
- High Strength & Toughness: It provides an excellent balance of these two properties, making it ideal for components that must withstand both high stress and impact.
- Good Fatigue Resistance: It holds up well under repeated stress cycles, which is critical for dynamic components.
- Excellent Machinability: In its annealed condition, it can be easily machined into complex shapes.
- Good Weldability: It can be welded using standard procedures, but pre- and post-weld heat treatments are recommended for critical applications to prevent cracking.
Applications
4140 alloy steel is a versatile grade used for a wide range of engineering and structural components. Key applications include:
- Shafts and Axles
- Gears and Pinions
- Connecting Rods
- Drill Collars
- Couplings and Spindles
- Bolts and Nuts for high-stress applications
Why Choose Jupiter Steels for AISI 4140?
As a premier steel stockist in India, Jupiter Steels is your reliable partner. We are committed to providing you with top-notch materials and service.
- Certified Quality: We supply high-quality, genuine AISI 4140 steel that meets international standards. Our reputation for excellence is a promise to our customers.
- Nationwide Supply Chain: While based in Delhi, our robust logistics network allows us to provide high-quality steel to customers across India, including Haryana, Manesar, Rajasthan, and other industrial areas.
- Expert Guidance: Our team has extensive knowledge of different steel grades. We don’t just sell steel; we provide expert advice to help you select the right material for your specific application.
AISI 4140 Steel FAQ Section
Q1: Is AISI 4140 considered a tool steel?
A: No, AISI 4140 is a medium carbon alloy steel, not a tool steel. While it can be used for some tooling applications, it lacks the high wear resistance of dedicated tool steels like 1.2379.
Q2: Can 4140 steel be used in high-temperature applications?
A: 4140 steel is primarily used for ambient and moderately elevated temperature applications. For hot work, a specific hot work steel like 1.2344 would be required.
Q3: Is 4140 steel easy to weld?
A: 4140 steel can be welded, but due to its high hardenability, it is susceptible to cracking, so preheating and post-weld heat treatment are often necessary for best results.
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