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Product Overview
Introduction To Engineering Steel 4340 / AISI 4340 Steel
MOKSH TUBES & FITTINGS LLP is a trusted supplier, exporter, importer, and stockist of 4340 alloy steel products such as bars, plates, sheets, and forgings.
EN 4340, is a high-strength, low-alloy steel known for its excellent toughness, fatigue strength, and resistance to impact and wear. It contains nickel, chromium, and molybdenum as alloying elements, providing enhanced hardenability and mechanical properties. 4340 is commonly used in aerospace, automotive, and heavy machinery applications where high strength and durability under stress are critical.
Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon | 0.38 – 0.43 |
| Manganese | 0.60 – 0.80 |
| Phosphorus | 0.035 |
| Silicon | 0.15 – 0.35 |
| Nickel | 1.65 – 2.00 |
| Chromium | 0.70 – 0.90 |
| Molybdenum | 0.20 – 0.30 |
| Sulfur | 0.040 |
Technical Composition
Physical Properties
| Property | Imperial | Metric |
|---|---|---|
| Density | 0.284 lb/in³ | 7.85 g/cm³ |
| Melting Point | 2600 °F | 1427 °C |
| Elastic Modulus | 29.7 ×10³ ksi | 205 GPa |
| Bulk Modulus | 20.3 ×10³ ksi | 140 GPa |
| Shear Modulus | 11.6 ×10³ ksi | 80 GPa |
| Thermal Conductivity | 309 BTU·in/hr·ft²·°F | 44.5 W/m·K |
| Poisson’s Ratio | 0.27–0.30 | — |
| Thermal Expansion | 6.8 µin/in·°F | 12.3 µm/m·°C |
| Specific Heat | 0.114 BTU/lb·°F | 0.475 J/g·°C |
| Electrical Resistivity | 0.0000248 Ω·cm | — |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 930 – 1080 MPa |
| Yield Strength | 745 – 930 MPa |
| Elongation at Break | 12 – 16 % |
| Hardness | 28 – 34 HRC |
| Impact Toughness | Excellent |
Products in Engineering Steel 4340
Engineering Steel 4340 is typically available in:
Engineering Steel 4340 products are produced to the following global standards:
Uses and Advantages
High strength and toughness with good fatigue resistance
Excellent wear and impact resistance
Good hardenability and ability to maintain mechanical properties after heat treatment
Versatile and widely used in critical structural and mechanical parts
Applications of Engineering Steel 4340
Engineering Steel 4340 is widely used in: in:
Aerospace & Defense
Aircraft landing gear, structural components, and fasteners requiring high strength and toughness.
Automotive Industry
Crankshafts, gears, axles, and drive shafts subjected to high stress.
Heavy Machinery & Industrial Equipment
Shafts, bolts, and connecting rods requiring fatigue resistance and impact strength.
Oil & Gas
Components for high-pressure and high-temperature applications such as drill collars and valve parts.
WHY CHOOSE US?
FAQ's
What is EN 4340 steel and why is it used in industries?
EN 4340 is a high strength, low-alloy steel containing nickel, chromium, and molybdenum, which provide superior toughness, hardenability, and wear resistance. Known for its excellent fatigue strength and ability to perform under high stress, 4340 is widely used in aerospace, automotive, oil and gas, and heavy machinery industries where strength, impact resistance, and durability are critical.
What are the key chemical and mechanical properties of EN 4340 steel?
EN 4340 steel has a chemical composition that includes 0.38–0.43% carbon, 1.65–2.00% nickel, 0.70–0.90% chromium, and 0.20–0.30% molybdenum, along with manganese, silicon, phosphorus, and sulfur in controlled amounts. It exhibits tensile strength between 930–1080 MPa, yield strength of 745–930 MPa, elongation of 12–16%, and hardness of 28–34 HRC. With excellent impact toughness and fatigue resistance, EN 4340 provides outstanding performance in demanding environments.
What EN 4340 steel products are supplied by MOKSH TUBES & FITTINGS LLP?
MOKSH TUBES & FITTINGS LLP offers a wide range of EN 4340 steel products including seamless and welded pipes, tubes, sheets, plates, coils, strips, round bars, hex bars, flat bars, square bars, pipe fittings, flanges, fasteners, and custom-fabricated components. All products are manufactured to meet international quality standards and can be supplied in both standard and customized dimensions to suit industry-specific requirements.
What are the major applications of EN 4340 steel?
EN 4340 steel is extensively used in aerospace and defense for aircraft landing gear, structural parts, and high-strength fasteners. In the automotive industry, it is applied in crankshafts, axles, gears, and drive shafts exposed to heavy loads. Heavy machinery and industrial equipment use EN 4340 for shafts, bolts, and connecting rods requiring durability and fatigue resistance, while the oil and gas industry applies it in drill collars, valve components, and high-pressure equipment.
Why choose MOKSH TUBES & FITTINGS LLP for EN 4340 steel materials?
MOKSH TUBES & FITTINGS LLP is a trusted global supplier and exporter of EN 4340 alloy steel with a comprehensive stock in multiple forms and sizes. The company provides customized cutting, forging, and processing services backed by expert technical support. With stringent quality control, international certifications, reliable worldwide deliveries, and competitive pricing, MOKSH TUBES & FITTINGS LLP ensures superior EN 4340 steel solutions tailored to diverse industrial needs.
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For inquiries or to request a quote for 4340 alloy steel products, contact Moksh Tubes & Fittings LLP — your reliable partner for premium engineering steels.
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