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Product Overview
Introduction To Engineering Steel 4340 / AISI 4340 Steel
Moksh Tubes & Fittings LLP is a reliable supplier, exporter, importer, and stockist of EN 4130 Alloy Steel (AISI 4130 / Cr-Mo Steel), offering a wide range of pipes, tubes, bars, plates, and fittings for various engineering and industrial applications. 4130 alloy steel is a highly versatile low-alloy grade valued for its high strength, excellent toughness, superior weldability, and strong fatigue resistance. With an exceptional strength-to-weight ratio, it is widely used in aerospace structures, motorsport chassis and roll cages, high-pressure tubing, oilfield tools, and critical mechanical components operating under demanding service conditions.
Whether used in aircraft components, racing frames, drill pipes, hydraulic assemblies, or other high-stress engineering applications, 4130 alloy steel delivers consistent and dependable performance under heavy loads, vibration, pressure, and extreme environments. We supply EN 4130 in multiple forms including round bars, flat bars, hex bars, square bars, plates, sheets, coils, strips, seamless pipes, welded tubes, forged blocks, rings, and custom-machined components. Material is available in annealed, normalized, quenched & tempered, hot-rolled, and cold-drawn conditions. All products are sourced from certified mills and supplied with EN 10204 3.1 / 3.2 certification, ensuring complete traceability, reliability, and quality for industrial and engineering use.
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4340 Alloy Steel Specifications
| Category | Details |
|---|---|
| Grade | AISI 4340 / UNS G43400 / EN 24 / 1.6511 |
| Type | High-Strength Low Alloy Steel (Ni-Cr-Mo Alloy) |
| Typical Chemical Composition | Ni 1.65–2.00%, Cr 0.70–0.90%, Mo 0.20–0.30%, C 0.38–0.43%, Mn 0.60–0.80%, Si 0.15–0.30% |
| Conditions | Annealed, Normalized, Hardened & Tempered, Hot Rolled, Forged |
| Heat Treatment | Hardening, Tempering, Stress Relieving |
| Testing | Tensile, Hardness, Impact, Chemical Analysis, UT (Optional) |
| Certification | EN 10204 3.1 / 3.2 |
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 |
4340 alloy steel gets its unique toughness from the combined Ni-Cr-Mo alloying.
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 | — |
Heat Treatment of 4340 Steel
| Heat Treatment Process | Temperature Range | Cooling / Procedure |
|---|---|---|
| Annealing | 790–870°C | Furnace cool |
| Normalizing | 830–900°C | Air cool |
| Hardening | 830–860°C | Oil or polymer quench |
| Tempering | 400–650°C | Depends on required hardness |
| Stress Relieving | 540–650°C | Hold 1–2 hours |
Mechanical Properties of 4340 Alloy Steel (Quenched & Tempered)
| Property | Annealed | Hot Finished | Cold Drawn | Hot Rolled | Sheet |
|---|---|---|---|---|---|
| Tensile Strength | 930–1080 MPa | — | — | — | — |
| Yield Strength | 745–930 MPa | — | — | — | — |
| Elongation (%) | 12–16% | — | — | — | — |
| Hardness | 28–34 HRC | — | — | — | — |
| Impact Toughness | Excellent | — | — | — | — |
4340 steel shows excellent toughness and high strength after quenching & tempering.
International Standards & Equivalent Grades — Alloy Steel 4340
| Standard | Equivalent Grade |
|---|---|
| AISI / SAE | 4340 |
| EN | 34CrNiMo6 / 1.6582 |
| DIN | 34CrNiMo6 |
| BS (British) | 817M40 |
| AFNOR (France) | 35NCD16 |
| JIS (Japan) | SNCM439 |
| GB (China) | 40CrNiMoA |
| ISO | 34CrNiMo6 |
| GOST (Russia) | 30ХГСА / 30KhGSA |
Products in Engineering Steel 4340
Engineering Steel 4340 is typically available in:
✔
Seamless Pipes
✔
Welded Pipes (ERW & EFW)
✔
Tubes (Capillary, U-Bend)
✔
Sheets & Plates
✔
Coils & Strips
✔
Round Bars, Flat Bars, Hex Bars, Square Bars
✔
Pipe Fittings (Elbows, Tees, Reducers, Caps, Stub Ends)
✔
Flanges (Weld Neck, Slip-On, Blind, Socket Weld, Threaded)
✔
Fasteners (Bolts, Nuts, Screws, Washers, Studs)
✔
Custom Fabricated Components
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.
Export Destinations
We export Alloy Steel 4340 to:
UAE, Saudi Arabia, Qatar, Oman, Kuwait, Bahrain, Turkey, Europe, USA, Canada, Singapore, Malaysia, Indonesia, South Africa, Nigeria.
WHY CHOOSE US?
4340 Steel Price per kg in India
Price varies based on size, OD, thickness, and heat-treatment condition.
Typical Range: ₹160 – ₹260 per kg (Indicative only)
Contact us for exact quotation based on size and quantity.
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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