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Product Overview
Introduction To Engineering Steel 4140 / AISI 4140 Steel
MOKSH TUBES & FITTINGS LLP is a trusted supplier, stockist, exporter, importer, and distributor of high-quality EN 4140 / AISI 4140 Alloy Steel products including pipes, tubes, bars, plates, sheets, forgings, and custom-machined components.
EN 4140 (AISI 4140 / 42CrMo4) is a chromium-molybdenum low-alloy steel known for its exceptional combination of high tensile strength, excellent toughness, superior fatigue resistance, and strong wear & abrasion resistance. It can be supplied in annealed, normalized, or quenched & tempered (Q&T) conditions, offering a wide range of mechanical properties suitable for demanding engineering applications.
Thanks to its high hardenability and consistent heat-treat response, EN 4140 is widely used in automotive components, oil & gas equipment, heavy machinery, aerospace parts, and general engineering applications requiring durability under dynamic and high-stress environments.
We supply EN 4140 steel in the following product forms:
- Seamless & welded pipes/tubes
- Round, square & flat bars
- Sheets & plates
- Forged bars & components
- Custom-cut sizes and precision-machined parts
All materials are supplied with EN 10204 3.1 / 3.2 certification for complete traceability and quality assurance.
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Engineering Steel EN 4140 – Material Specifications
| Category | Details |
|---|---|
| Grade | EN 4140 / 42CrMo4 / AISI 4140 |
| Type | Alloy Steel (Chromium–Molybdenum) |
| Typical Conditions | Annealed, Normalized, Hot Rolled, Forged, Quenched & Tempered |
| Heat Treatment | Quenching & Tempering, Stress Relieving |
| Testing | Tensile, Hardness, Chemical, UT / NDT (on request) |
| Certification | EN 10204 3.1 / 3.2 (Mill Test Certificate) |
Chemical Composition of EN 4140 / AISI 4140 Steel
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.38 – 0.43 |
| Manganese (Mn) | 0.75 – 1.00 |
| Chromium (Cr) | 0.80 – 1.10 |
| Molybdenum (Mo) | 0.15 – 0.25 |
| Silicon (Si) | 0.15 – 0.35 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.040 |
Chromium–molybdenum alloying improves strength, hardenability, fatigue life, and wear resistance.
Mechanical Properties of EN 4140 Steel
| Property | Annealed | Hot Finished | Cold Drawn | Hot Rolled | Sheet |
|---|---|---|---|---|---|
| Tensile Strength (MPa) | 620–724 | 655–827 | 690–896 | 620–758 | 586–724 |
| Yield Strength (MPa) | 414–517 | 482–758 | 517–827 | 414–586 | 379–517 |
| Elongation (%) | 20–30 | 15–25 | 12–20 | 20–30 | 20–25 |
| Brinell Hardness (HB) | 150–200 | 180–250 | 200–260 | 150–210 | — |
| Rockwell Hardness | 80–90 B | 85–95 B | 85–95 B | 80–90 B | 80–90 B |
👉 28–36 HRC (Quenched & Tempered)
👉 50–55 HRC (Induction / Flame Hardened Surface)
Uses and Advantages
High strength and toughness
Excellent wear and abrasion resistance
Good fatigue strength
Excellent hardenability and heat treatment response
Applications of Engineering Steel 4140
Engineering Steel 4140 is extensively used in:
Chemical Processing
Oil & Gas
Marine
Pharmaceutical
Heat Exchangers
Power Plants
WHY CHOOSE US?
FAQ's
What is EN 4140 steel and what are its main features?
EN 4140 is a chromium-molybdenum low-alloy steel well-known for its high tensile strength, toughness, and superior wear resistance. It is a highly versatile engineering material that can be heat-treated to achieve a wide range of mechanical properties. Because of its excellent fatigue resistance and ability to perform under high stress, EN 4140 is widely used in automotive, oil and gas, aerospace, and heavy machinery industries.
What are the chemical and mechanical properties of EN 4140 steel?
EN 4140 steel contains 0.38–0.43% carbon, 0.80–1.10% chromium, and 0.15–0.25% molybdenum, along with manganese, silicon, phosphorus, and sulfur in controlled amounts. Its tensile strength ranges from 586–896 MPa and yield strength from 379–827 MPa, depending on the condition and heat treatment. It has elongation values up to 30%, Brinell hardness between 150–260, and Rockwell hardness of 80–95 B. These properties make EN 4140 a strong, tough, and durable alloy steel suitable for high-performance engineering applications.
What EN 4140 steel products are supplied by MOKSH TUBES & FITTINGS LLP?
MOKSH TUBES & FITTINGS LLP manufactures and supplies a complete range of EN 4140 steel products including seamless and welded pipes, tubes, sheets, plates, coils, strips, bars, pipe fittings, flanges, fasteners, and custom-fabricated components. All products are manufactured to international standards and are available in customized sizes, dimensions, and heat treatments to suit diverse industrial needs.
What are the common applications of EN 4140 steel?
EN 4140 steel is extensively used in the automotive industry for axles, crankshafts, gears, and connecting rods that demand high strength and fatigue resistance. In the oil and gas sector, it is applied in pipelines, drilling equipment, and high-pressure tubing exposed to extreme environments. It is also widely used in aerospace for components requiring high tensile strength under dynamic loads, and in mechanical engineering for heavy-duty shafts, bolts, and machinery parts.
Why choose MOKSH TUBES & FITTINGS LLP for EN 4140 steel materials?
MOKSH TUBES & FITTINGS LLP is a trusted supplier and exporter of EN 4140 steel with a comprehensive stock of products in multiple forms. The company provides customized cutting and processing services, technical support for material selection, and ensures reliable global deliveries. With competitive pricing, premium quality materials, and a strong focus on customer satisfaction, MOKSH TUBES & FITTINGS LLP is the preferred choice for industries requiring durable and high-performance EN 4140 steel solutions.
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For detailed information or to request a quote for EN 4140 steel products, contact Moksh Tubes & Fittings LLP — your trusted partner for alloy steels.
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