EN24 Round Bar Supplier Mumbai for High-Strength Shafts, Gears and Heavy Engineering
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Meta Description: EN24 Round Bar Supplier Mumbai supplying 817M40 alloy steel round bars for shafts, gears, axles, studs, automotive parts and heavy engineering applications.
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Table of Contents
- What Is EN24 Round Bar?
- EN24 817M40 Steel Grade
- EN24 Chemical Composition
- EN24 Round Bar Mechanical Properties
- Why EN24 Is Used for Heavy Engineering
- EN24 Round Bar Applications
- EN24 Heat Treatment
- EN24 Machining and Welding
- EN24 Round Bar Sizes and Finishes
- EN24 Round Bar Price Factors
- How to Buy EN24 Round Bar
- EN24 Round Bar Supplier in Mumbai
- Frequently Asked Questions
- Request a Quote
What Is EN24 Round Bar?
EN24 Round Bar is a nickel-chromium-molybdenum alloy steel used for components where high strength, toughness and hardenability are required.
EN24 is commonly associated with the historical 817M40 designation. It is used for demanding engineering components where a higher-performance alloy steel is preferred over plain carbon steel.
The grade is particularly relevant to shafts, gears, axles, studs, spindles, crankshafts and heavy-duty machinery components.
EN24 is also commonly encountered in the market under the designation 4340-type alloy steel, although an exact grade substitution should always be confirmed against the applicable specification, chemistry and mechanical requirements.
For procurement, a clear enquiry should identify the grade as:
EN24 / 817M40 Alloy Steel Round Bar
EN24 817M40 Steel Grade
EN24 belongs to the nickel-chromium-molybdenum family of alloy steels.
The historical BS designation 817M40 is still widely used commercially, particularly in the Indian engineering-steel market. Because the older BS specifications have been withdrawn, buyers should verify the exact specification required by the engineering drawing or customer purchase order.
A typical enquiry can include:
Material: EN24
Designation: 817M40
Product: Round Bar
Diameter: Required size
Length: Required length
Condition: As specified
Heat Treatment: As required
Finish: As required
Quantity: Required quantity
For high-strength components, the heat-treatment condition should be clearly stated because EN24’s final mechanical properties depend heavily on processing.
EN24 Chemical Composition
EN24 contains nickel, chromium and molybdenum in addition to carbon and manganese.
A commonly published composition range for EN24 / 817M40 is:
| Element | Typical Range |
|---|---|
| Carbon (C) | 0.35–0.45% |
| Silicon (Si) | 0.10–0.35% |
| Manganese (Mn) | 0.45–0.70% |
| Nickel (Ni) | 1.30–1.80% |
| Chromium (Cr) | 0.90–1.40% |
| Molybdenum (Mo) | 0.20–0.35% |
| Sulphur (S) | Controlled to specification |
| Phosphorus (P) | Controlled to specification |
| Iron (Fe) | Balance |
The exact chemical limits depend on the applicable material specification.
Nickel, chromium and molybdenum work together to give EN24 its useful combination of hardenability, strength and toughness.
For production procurement, the Mill Test Certificate (MTC) should be used to verify the actual heat chemistry.
EN24 Round Bar Mechanical Properties
EN24 can achieve high mechanical strength after appropriate heat treatment.
Its final properties depend on factors such as:
- Bar diameter
- Heat-treatment cycle
- Quenching method
- Tempering temperature
- Material condition
- Section size
Because of this, there is no single tensile-strength value that applies to every EN24 Round Bar.
The main engineering characteristics buyers should consider are:
| Property | Importance |
|---|---|
| Tensile Strength | Load-bearing capability |
| Yield Strength | Resistance to permanent deformation |
| Toughness | Resistance to impact and fracture |
| Hardness | Wear and surface-performance considerations |
| Hardenability | Ability to develop hardness through the section |
| Fatigue Resistance | Important for rotating and cyclically loaded parts |
EN24 is particularly valuable when a component needs a combination of high strength and useful toughness, rather than maximum hardness alone.
For critical applications, the required mechanical values should be specified for the actual bar diameter and heat-treatment condition.
Why EN24 Is Used for Heavy Engineering
EN24 is designed for demanding engineering applications where ordinary medium-carbon steel may not provide the required performance.
The alloying elements improve hardenability, allowing appropriate heat treatment to produce high strength across useful section sizes.
This makes EN24 particularly attractive for:
- Heavy-duty shafts
- Power-transmission components
- Gears
- Axles
- Spindles
- High-strength studs
- Automotive components
- Heavy machinery
Its combination of toughness and strength is especially useful for components subjected to repeated mechanical loading.
EN24 Round Bar Applications
Shafts
EN24 Round Bar is widely used for high-strength shafts exposed to bending, torsional and cyclic loads.
The available round-bar form also makes it convenient for machining cylindrical components.
Gears
EN24 can be used for selected gears and gear-related components where high strength and toughness are required.
Axles
The material is suitable for selected heavy-duty axles and rotating components.
Spindles
EN24 is used for various spindle applications where dimensional accuracy and mechanical strength are important.
Crankshafts
The grade can be considered for selected crankshaft and power-transmission applications where high-strength alloy steel is required.
Studs and Fasteners
EN24 can be used for selected high-strength studs and specialized fastener components when the required heat-treated properties are achieved.
Heavy Machinery Components
Industrial machinery manufacturers use alloy steels such as EN24 for components subjected to substantial mechanical loads and repeated service.
EN24 Heat Treatment
Heat treatment is a critical part of EN24 material selection.
Annealing
Annealing can be used to soften the material and improve machinability before subsequent manufacturing operations.
Normalizing
Normalizing can be used to establish a more uniform microstructure and suitable mechanical condition.
Hardening
EN24 can be hardened by heating to the appropriate austenitizing temperature followed by controlled quenching.
This can substantially increase strength and hardness.
Tempering
Tempering after hardening is used to establish the required balance between hardness, strength and toughness.
Surface Hardening
Selected EN24 components may also undergo induction or other surface-hardening processes where increased surface wear resistance is required.
The exact heat-treatment cycle must be selected according to the diameter, required properties and component design.
For a procurement specification, it is better to state the required hardness or mechanical-property range than simply asking for “heat-treated EN24.”
EN24 Machining and Welding
EN24 is machinable in suitable delivery conditions.
Common operations include:
- Turning
- Milling
- Drilling
- Boring
- Threading
- Grinding
Machinability depends strongly on hardness and delivery condition.
Annealed or normalized material is generally more suitable for machining than heavily hardened EN24.
For production components, machining allowances should also be considered because heat treatment can cause dimensional changes or distortion.
Welding EN24
EN24 is more demanding to weld than low-carbon steel.
Its carbon and alloy content increase hardenability, meaning the heat-affected zone can develop hard microstructures when welding conditions are not controlled.
For welded applications, the procedure should consider:
- Preheating
- Interpass temperature
- Heat input
- Cooling rate
- Suitable filler material
- Post-weld heat treatment where required
For critical components, the welding procedure should be established by a qualified welding engineer according to the relevant project requirements.
EN24 Round Bar Sizes and Finishes
EN24 Round Bar can be required in different diameters, lengths and surface finishes.
Common supply conditions include:
Hot Rolled / Black Round Bar
Suitable where machining allowance is acceptable.
Bright Round Bar
Used where improved surface finish and dimensional control are required.
Turned or Peeled Round Bar
Useful where a controlled starting diameter is required before further machining.
Ground Round Bar
Suitable for precision components requiring tighter dimensional and surface control.
Forged Round Bar
Relevant for selected large-diameter or heavy-engineering requirements.
Manan Steel & Metals’ published round-bar range includes various forms such as hot-rolled, cold-drawn, bright, forged, peeled, turned and centre-ground bars. Explore the Manan Steel & Metals round-bar range.
EN24 Round Bar Price Factors
The EN24 Round Bar price depends on the full technical requirement.
Diameter
Larger diameters require greater material weight and can involve different processing requirements.
Length
Standard lengths and cut-to-length requirements can have different costs.
Heat Treatment
Annealed, normalized or hardened-and-tempered material can require different processing.
Surface Finish
Bright, peeled, turned and ground finishes require additional processing compared with basic hot-rolled material.
Quantity
Production quantities and small orders may have different commercial pricing.
Testing
MTC, hardness testing, mechanical testing, ultrasonic testing and third-party inspection can affect the quotation depending on the application.
Availability
The availability of the required EN24 diameter and condition can influence both price and delivery time.
For an accurate EN24 Round Bar price in Mumbai, buyers should provide the complete specification rather than requesting only a generic price per kilogram.
How to Buy EN24 Round Bar
A useful purchase enquiry should include:
Material: EN24 / 817M40
Product: Round Bar
Diameter: ___ mm
Length: ___ mm
Condition: Annealed / Normalized / As required
Heat Treatment: Hardened & Tempered / Surface Hardened / As specified
Finish: Black / Bright / Ground / Turned
Quantity: ___ kg / pieces
Testing: MTC / Hardness / UT / Third Party / Other
Application: Shaft / Gear / Axle / Spindle / Machinery Component / Other
If the requirement originates from an engineering drawing, send the material designation, heat-treatment condition and mechanical-property requirements exactly as shown on the drawing.
This helps prevent confusion between EN24 and other nickel-chromium-molybdenum alloy steels.
EN24 Round Bar Supplier in Mumbai
For companies searching for an EN24 Round Bar Supplier Mumbai, Manan Steel & Metals supplies engineering round bars and specialty metal products for industrial requirements.
Manan’s published round-bar range includes multiple engineering materials and bar forms, with options for applications across automotive, machinery, aerospace and other industrial sectors. View the Manan Steel & Metals round-bar range.
For an EN24 enquiry, provide:
EN24 / 817M40
Diameter
Length
Condition
Heat Treatment
Finish
Quantity
Testing Requirement
Application
A complete enquiry helps the supplier understand the actual component requirement and prepare a more relevant quotation.
Frequently Asked Questions
What is EN24 Round Bar?
EN24 Round Bar is a nickel-chromium-molybdenum alloy steel round bar used for high-strength engineering components such as shafts, gears, axles, spindles and heavy machinery parts.
What is the designation of EN24 steel?
EN24 is commonly associated with 817M40 in the historical BS designation system. The exact specification should be confirmed against the project requirement.
Is EN24 the same as 4340 steel?
EN24 and AISI/SAE 4340 are often considered similar nickel-chromium-molybdenum alloy steels, but they should not automatically be treated as identical. Chemical limits, standards and mechanical-property requirements must be checked before substitution.
Is EN24 suitable for shafts?
Yes. EN24 is widely considered for high-strength shafts and power-transmission components where strength and toughness are important.
Can EN24 Round Bar be heat treated?
Yes. EN24 can be annealed, normalized, hardened and tempered and may also be surface hardened for selected applications.
Is EN24 suitable for welding?
EN24 requires controlled welding procedures because its alloy and carbon content increase hardenability. Preheating and other precautions may be required depending on the component and welding procedure.
What affects EN24 Round Bar price?
Diameter, length, heat-treatment condition, surface finish, quantity, testing, documentation, availability and market conditions can influence the final price.
How can I get an EN24 Round Bar quotation in Mumbai?
Send the EN24/817M40 grade, required diameter, length, heat-treatment condition, finish, quantity and testing requirements to Manan Steel & Metals.
Request a Quote for EN24 Round Bar
Manan Steel & Metals
Shop No. 2, Hira Building, 97 Khetwadi Main Road (Nanubhai Desai Road), Girgaon, Mumbai – 400004, Maharashtra, India
Phone: 7977369869
Email: manansteel@gmail.com
Website: www.manansteel.com
For a faster quotation, send:
Material: EN24 / 817M40
Diameter: ___ mm
Length: ___ mm
Condition: ___
Heat Treatment: ___
Finish: ___
Quantity: ___ kg / pieces
Testing: ___
Application: ___
For industrial procurement, complete specification details help ensure that the quoted EN24 Round Bar matches the required engineering condition.
EN24 is commonly associated with the historical 817M40 designation. The older BS 970 specifications have been withdrawn, so buyers should confirm the specification required by their engineering drawing or purchase order. Read the BSI reference for BS 970 steel specifications.