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AISI 4340 Steel Supplier in India | High-Strength Alloy Steel for Critical Applications
Introduction to AISI 4340 Steel
AISI 4340 steel is a premium, low-alloy steel known for its exceptional strength, toughness, and fatigue resistance. It is a nickel-chromium-molybdenum alloy that is highly valued in industries requiring materials for critical, high-stress applications. This steel exhibits excellent hardenability and can be heat-treated to achieve very high strength levels. At Jupiter Steels, based in Delhi, we are a trusted stockist and supplier of AISI 4340 steel, providing certified material to customers throughout India, including key industrial regions like Manesar, Haryana, and beyond.
Chemical Composition of AISI 4340 Steel
The outstanding properties of 4340 steel are 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%
- Manganese (Mn): 0.60 – 0.80%
- Chromium (Cr): 0.70 – 0.90%
- Nickel (Ni): 1.65 – 2.00%
- Molybdenum (Mo): 0.20 – 0.30%
- Silicon (Si): 0.15 – 0.35%
Functioning and Reasoning of Chemical Elements
- Nickel (Ni): The high nickel content in AISI 4340 is the primary reason for its superior toughness and impact strength, especially at high hardness levels. Nickel helps to improve the steel’s ability to resist cracking and fatigue.
- Chromium (Cr) & Molybdenum (Mo): This combination provides the steel with excellent hardenability. It allows the material to achieve high, uniform hardness throughout large sections after heat treatment. Molybdenum also helps prevent temper brittleness, ensuring ductility.
Hardness, Properties, and Applications of 4340
Hardness
In its annealed condition, AISI 4340 steel typically has a hardness of around 217 HB. It can be hardened and tempered to achieve a high working hardness in the range of 30-50 HRC, or even higher depending on the application.
Properties
- High Tensile Strength: It is known for its very high tensile and yield strength, making it ideal for components under extreme stress.
- Excellent Toughness: It provides a great balance of strength and toughness, allowing it to withstand heavy impact and shock loads.
- Superior Fatigue Resistance: This is a critical property, as it allows components to endure repeated stress cycles without failing.
- Good Machinability: In its annealed state, it can be easily machined into complex shapes.
Applications
4340 alloy steel is a critical material for high-stress applications in various industries. Key applications include:
- Aircraft landing gear and structural parts
- Heavy-duty shafts and gears
- Connecting rods and crankshafts
- High-strength bolts and fasteners
- Tooling for forging and extrusion dies
Why Choose Jupiter Steels for AISI 4340?
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 4340 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 4340 Steel FAQ Section
Q1: What is AISI 4340 steel used for?
A: AISI 4340 is primarily used for high-strength engineering components that require exceptional toughness and fatigue resistance, such as aircraft parts, heavy-duty shafts, and gears.
Q2: How does 4340 steel differ from 4140 steel?
A: 4340 steel has a higher nickel content, which gives it superior toughness, particularly in large sections, compared to 4140 steel. This makes 4340 suitable for more critical, high-stress applications.
Q3: Is 4340 steel easy to weld?
A: 4340 steel can be welded, but due to its high hardenability, it is susceptible to cracking. It requires specific preheating and post-weld heat treatments to achieve sound welds.
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