EN24 Round Bars are high-strength alloy steel bars widely selected for components that require a strong combination of tensile strength, toughness, hardenability, wear resistance and dependable dimensional performance. Also identified with 817M40, EN24 is a nickel-chromium-molybdenum alloy steel traditionally used for demanding engineering applications such as shafts, gears, spindles, pinions, studs, couplings and other highly stressed machine components. Jineshwar Steels supplies EN24 Round Bars in a range of sizes, surface finishes and delivery conditions to suit engineering, manufacturing, automotive, power transmission and heavy industrial requirements. The grade is particularly valued because its alloying system provides good through-hardening characteristics and allows engineers to select suitable heat-treatment conditions according to the required strength and toughness. EN24 is also commonly associated with DIN 34CrNiMo6 and material number 1.6582, while AISI 4340 is frequently referenced as a comparable grade rather than an automatic one-to-one specification replacement.

As an experienced EN24 Round Bars manufacturer, Jineshwar Steels focuses on supplying material according to the purchaser's specified grade, size, condition and inspection requirements. EN24 Round Bars can be supplied in annealed, normalized or hardened-and-tempered conditions depending on the intended application and procurement specification. The hardened-and-tempered T condition is particularly important for applications where high strength and toughness are required. Published technical references commonly show EN24T tensile strength in the approximate range of 850–1000 MPa, with representative yield-strength, elongation and hardness values depending on the applicable section and specification. Because mechanical properties are affected by heat treatment and ruling section, buyers should always specify the required condition and obtain the applicable material test certificate before final acceptance.

Table of Contents

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EN24 Round Bars Specifications

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EN24 Round Bars Chemical Composition

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EN24 Round Bars Mechanical Properties

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EN24 Round Bars Applications

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EN24 Round Bars Latest Price List

The chemical composition of EN24 provides the metallurgical foundation for its performance. Carbon contributes to strength and hardenability, while chromium supports hardenability and wear resistance. Nickel contributes to toughness and strength, and molybdenum improves hardenability and supports performance during heat treatment. A typical EN24/817M40 chemistry contains approximately 0.36–0.44% carbon, 0.10–0.35% silicon, 0.45–0.70% manganese, 1.00–1.40% chromium, 1.30–1.70% nickel and 0.20–0.35% molybdenum, with phosphorus and sulphur controlled to specified maximum levels. These values are presented as a commonly referenced EN24 composition range; the applicable purchase specification and MTC should be used for contractual acceptance.

For customers looking to buy EN24 Round Bars, Jineshwar Steels can support both standard procurement and project-specific requirements. Material may be supplied as hot-finished or bright bars depending on availability and specification, with cut lengths available for machining and fabrication requirements. Surface conditions, dimensional tolerances, straightness, ultrasonic testing and other inspection requirements can be discussed before order confirmation. As a trusted supplier, the objective is to match the material documentation with the physical product so that purchasing, quality-control and production teams have clear traceability. Customers can also request EN24 material with third-party inspection or additional testing when required by project specifications.

EN24 Round Bars are especially useful where ordinary carbon steel does not provide sufficient strength or hardenability. Their applications include power-transmission shafts, gears, pinions, spindles, axles, studs, bolts, couplings, machine components, rolls and other components exposed to high mechanical loads. The material's combination of strength and toughness makes it suitable for components subjected to impact, torsional or cyclic loading when correctly designed and heat treated. For example, EN24 is widely referenced for shafts, gears, journals and spindles because these components can require both surface durability and adequate core toughness. The final selection, however, should be based on actual service loads, component geometry, operating temperature, fatigue requirements and applicable engineering standards rather than grade name alone.

Specification	Details
Product Name	EN24 Round Bars
Material Grade	EN24 / 817M40
Material Number	1.6582
Material Type	Nickel Chromium Molybdenum Alloy Steel
Shape	Round Bar
Standards / References	BS 970 / EN24 / 817M40 / Comparable international grades as per customer specification
Supply Condition	Annealed / Hardened & Tempered / Normalized as required
Surface Finish	Hot Rolled / Black / Bright / Peeled / Ground as per requirement
Size Range	Available as per customer requirement
Length	Standard Length / Fixed Length / Cut Length
Heat Treatment	Annealing / Hardening / Tempering according to application requirement
Inspection	Dimensional Inspection, Hardness Testing, Mechanical Testing, Chemical Analysis
Documentation	Material Test Certificate (MTC) and inspection documents as agreed

Element	C	Si	Mn	P	S	Cr	Mo	Ni
Composition (%)	0.36–0.44	0.10–0.35	0.45–0.70	≤ 0.035	≤ 0.040	1.00–1.40	0.20–0.35	1.30–1.70

Property	Tensile Strength	Yield Strength	Elongation	Reduction of Area	Brinell Hardness	Impact Strength
Hardened & Tempered Condition (Typical)	850–1000 MPa	650 MPa Minimum (Typical Reference)	12% Minimum (Typical Reference)	Approx. 45% Minimum	248–302 HB	Dependent on section size, heat treatment and applicable specification