EN25 Alloy Steel Round Bar Supplier Mumbai for Heavy-Duty Shafts and Industrial Components
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Table of Contents
- What Is EN25 Alloy Steel Round Bar?
- Why EN25 Is Used for Heavy-Duty Components
- EN25 826M31 and Material Designations
- EN25 Chemical Composition
- EN25 Mechanical Properties
- EN25 Heat Treatment and Hardening
- EN25 Round Bar Applications
- EN25 Round Bar for Shafts and High-Load Components
- EN25 Machining and Welding Considerations
- EN25 Round Bar Sizes and Supply Requirements
- What Affects EN25 Round Bar Price?
- How to Buy EN25 Round Bar
- EN25 Alloy Steel Round Bar Supplier in Mumbai
- Frequently Asked Questions
- Request a Quote
What Is EN25 Alloy Steel Round Bar?
EN25 Alloy Steel Round Bar is a nickel-chromium-molybdenum alloy steel used for components where high strength, toughness and hardenability are important.
EN25 is commonly associated with 826M31 under the British steel designation system. Technical references describe the grade as a high-hardenability, high-tensile steel intended particularly for heavily stressed components and large sections.
Its alloying system includes nickel, chromium and molybdenum. These additions help the steel achieve useful hardenability and mechanical performance after appropriate heat treatment.
This makes EN25 Round Bar particularly relevant for engineering components that need to carry substantial mechanical loads.
Unlike a generic mild-steel bar, EN25 is normally selected because the component needs a higher level of mechanical performance.
Why EN25 Is Used for Heavy-Duty Components
The main commercial attraction of EN25 is its combination of strength, toughness and hardenability.
Technical references describe EN25 as suitable for large sections where high strength is required. It is also used for components such as shafts, axles, connecting rods, pump shafts and gears.
This makes the grade relevant for applications where a component may experience:
- High tensile loading
- Bending loads
- Torsional loading
- Shock loading
- Repeated loading
- Wear at selected surfaces
- High mechanical stresses
Hardenability is particularly useful when a component has a relatively large cross-section. The engineering requirement is not simply to have a hard surface; the desired mechanical properties need to be achieved throughout the relevant section.
For this reason, EN25 alloy steel for shafts remains a useful search and procurement category for heavy engineering.
EN25 826M31 and Material Designations
Buyers may encounter several designations when sourcing EN25.
| Designation | Material Reference |
|---|---|
| EN25 | Traditional British grade designation |
| 826M31 | British designation |
| W. Nr. 1.6743 | Common European/German material reference |
| 32NiCrMo10-4 | DIN/European designation found in technical references |
| BS 970 | Historical British specification reference |
Published technical references associate EN25 with 826M31, 1.6743 and 32NiCrMo10-4.
When buying material, however, the designation alone should not be treated as sufficient.
The purchase order should also state the applicable specification, dimensions, condition, testing requirements and documentation.
For example:
EN25 / 826M31 / Round Bar / 75 mm diameter / Hardened & Tempered / MTC required
This is much more precise than simply asking for “EN25 steel.”
EN25 Chemical Composition
EN25 is a nickel-chromium-molybdenum alloy steel.
A commonly published composition range is:
| Element | Typical Range |
|---|---|
| Carbon (C) | 0.27–0.35% |
| Silicon (Si) | 0.10–0.40% |
| Manganese (Mn) | 0.45–0.70% |
| Nickel (Ni) | 2.30–2.80% |
| Chromium (Cr) | 0.50–0.80% |
| Molybdenum (Mo) | 0.45–0.65% |
| Phosphorus (P) | 0.04% max |
| Sulfur (S) | 0.04% max |
These ranges are published in technical EN25 references and may vary according to the particular specification or standard edition.
The nickel-chromium-molybdenum combination is important to the alloy’s hardenability and strength characteristics.
For an actual purchase, the supplied Mill Test Certificate should be checked against the applicable material specification.
EN25 Mechanical Properties
EN25 is commonly supplied in a hardened-and-tempered condition for engineering applications.
One Mumbai-based EN25 supplier reference describes the grade as generally supplied hardened and tempered in the approximate tensile range of 930–1080 MPa, with a hardness range around 28–36 HRC in the cited condition.
However, mechanical properties should not be treated as one universal number for every EN25 bar.
The actual values depend on factors including:
- Heat-treatment condition
- Bar diameter
- Product specification
- Sampling location
- Manufacturing route
- Required inspection standard
A useful procurement table is therefore:
| Property | Why It Matters |
|---|---|
| Tensile Strength | Overall load-bearing capability |
| Yield Strength | Resistance to permanent deformation |
| Hardness | Wear and machining considerations |
| Toughness | Resistance to shock and fracture |
| Hardenability | Important for larger sections |
| Elongation | Indicates ductility |
For critical components, use the certified values supplied with the actual heat rather than relying on generic online property tables.
EN25 Heat Treatment and Hardening
Heat treatment is an important part of achieving the required performance from EN25.
The grade is frequently supplied in a hardened and tempered condition. Technical references also indicate that pre-hardened and tempered EN25 can be further surface hardened by methods such as flame or induction hardening, and by nitriding, where appropriate to the application and specification.
The exact process should be selected according to:
- Component size
- Required hardness
- Required core properties
- Surface-wear requirement
- Distortion limits
- Applicable engineering specification
For large shafts or heavily loaded components, controlling the heat-treatment process is particularly important because the final properties must satisfy the actual component design.
EN25 Round Bar Applications
EN25 Shaft Material
One of the strongest commercial applications for the grade is shaft manufacturing.
EN25 is used for various shaft applications where higher strength and toughness are required.
Potential examples include:
- Motor shafts
- Pump shafts
- Line shafts
- Jack shafts
- Piston rods
- Spindles
- Torsion bars
Technical references specifically identify pump shafts, line shafts, motor shafts and other shafts among EN25 applications.
Axles and Connecting Rods
The combination of strength and toughness makes EN25 relevant to selected axles and connecting rods.
Gears
EN25 can be used for selected gear and winch-gear applications where the required mechanical and heat-treatment properties can be achieved.
Hydraulic Components
The grade is also used in selected hydraulic components such as rams, clamps and other heavily loaded parts.
Drill Shanks and Die Holders
EN25 is used for selected drill shanks, die holders and other engineered components requiring high strength.
Heavy Forgings
Large-section components and heavy forgings are an important application category because EN25 is valued for its hardenability in substantial sections.
EN25 Round Bar for Shafts and High-Load Components
When a buyer searches for EN25 shaft material, the requirement is normally driven by the mechanical duty of the finished component.
For a shaft, the engineering team may need to consider:
Diameter: Determines section size and material quantity.
Torsional load: Important for rotating shafts.
Bending load: Important where shaft geometry creates bending stresses.
Shock loading: Relevant for heavy machinery.
Surface hardness: May be important where wear occurs.
Core toughness: Important when the component experiences impact or cyclic loading.
Heat treatment: Determines the final balance of strength, hardness and toughness.
A supplier should therefore be given the actual shaft drawing or, at minimum, the diameter, length, condition and expected service requirement.
EN25 Machining and Welding Considerations
EN25 machining behaviour depends strongly on its supplied condition.
A hardened-and-tempered bar should be machined using tooling and cutting parameters suitable for its actual hardness.
Machining considerations include:
- Stable workholding
- Correct cutting-tool selection
- Suitable cutting speed
- Controlled feed rate
- Adequate coolant where required
- Avoiding excessive heat
- Monitoring tool wear
- Maintaining dimensional control
Welding requires additional attention because EN25 is a high-strength alloy steel rather than a simple low-carbon steel.
The welding procedure should be developed around the actual material condition and component thickness, with appropriate preheating, interpass control and post-weld treatment where required by the project specification.
For critical structural or pressure-related applications, welding should be performed according to an approved procedure rather than a generic steel-welding setting.
EN25 Round Bar Sizes and Supply Requirements
EN25 Round Bar can be purchased in different diameters, lengths and finishes depending on the application.
For procurement, specify:
| Requirement | Example |
|---|---|
| Grade | EN25 |
| Designation | 826M31 |
| Diameter | 50 mm |
| Length | 3 m / 6 m |
| Condition | Hardened & Tempered |
| Finish | Black / Bright / Turned |
| Tolerance | As per drawing |
| Quantity | ___ kg |
| Testing | Hardness / MTC |
| Application | Shaft / Gear / Pump Component |
Manan Steel & Metals currently lists EN25 Alloy Steel Round Bar among its products. Its published EN25 listing includes forged material, approximately 40–100 mm sizes, and industrial/automotive applications.
What Affects EN25 Round Bar Price?
The EN25 Round Bar price depends on the actual specification.
Diameter
Larger sections require more alloy steel and can involve different production requirements.
Heat-Treatment Condition
Hardened-and-tempered material may have different processing costs from untreated stock.
Finish
Black, bright, turned, peeled or precision-finished material can have different prices.
Length
Standard stock and cut-to-length material may have different preparation costs.
Testing
Hardness testing, chemical analysis, MTC and additional inspection can affect the final quotation.
Quantity
Industrial quantities can receive different pricing from small maintenance requirements.
Market Conditions
Alloying elements such as nickel, chromium and molybdenum influence the cost of EN25 steel.
For a current EN25 Alloy Steel Round Bar price in Mumbai, provide the complete grade, size, condition and quantity rather than relying on a generic price per kilogram.
How to Buy EN25 Round Bar
For a useful quotation, send the supplier:
Material: EN25 Alloy Steel Round Bar
Designation: 826M31
Diameter: ___ mm
Length: ___ mm
Condition: Hardened & Tempered / As Required
Finish: ___
Quantity: ___ kg / pieces
Testing: ___
MTC: Required / Not Required
Application: Shaft / Gear / Pump / Automotive / Heavy Engineering
Providing the application is especially useful when you are unsure about the appropriate delivery condition.
EN25 Alloy Steel Round Bar Supplier in Mumbai
For buyers searching for an EN25 Alloy Steel Round Bar Supplier Mumbai, Manan Steel & Metals lists EN25 Alloy Steel Round Bar among its EN Series and round-bar products. The company’s published product information identifies EN25 for industrial and automotive applications.
You can visit the EN25 Alloy Steel Round Bar product section on the Manan Steel & Metals website before sending your enquiry.
For a quotation, specify:
EN25 / 826M31
Required diameter
Required length
Heat-treatment condition
Finish
Quantity
Testing/documentation
Application
The more complete the requirement, the easier it is to quote the correct EN25 bar rather than a generic alloy-steel product.
Frequently Asked Questions
What is EN25 Alloy Steel?
EN25 is a nickel-chromium-molybdenum alloy steel used for high-strength and highly stressed engineering components, especially larger sections requiring useful hardenability and toughness.
What is the designation of EN25?
EN25 is commonly associated with 826M31 in the British designation system. Technical references also associate it with material number 1.6743 and 32NiCrMo10-4.
What is EN25 used for?
Typical applications include shafts, axles, connecting rods, pump shafts, motor shafts, gears, piston rods, spindles, hydraulic components and heavy forgings.
Is EN25 suitable for shaft manufacturing?
Yes. EN25 is commonly used for selected shaft applications where high strength and toughness are required.
Is EN25 supplied hardened and tempered?
EN25 is commonly supplied in hardened-and-tempered conditions for engineering applications. The exact delivery condition should be stated in the purchase requirement.
Can EN25 be surface hardened?
Technical references indicate that EN25 can be further surface hardened using processes such as flame or induction hardening and nitriding, subject to the application and appropriate procedure.
Is EN25 easy to weld?
EN25 requires more controlled welding procedures than ordinary low-carbon steel because of its alloy content and hardenability. The actual welding procedure should be selected according to material condition, thickness and project requirements.
What information is required to buy EN25 Round Bar?
Provide EN25/826M31 designation, diameter, length, heat-treatment condition, finish, quantity, testing requirements and intended application.
Request a Quote for EN25 Alloy Steel 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
Send your requirement in this format:
Material: EN25 Alloy Steel Round Bar
Designation: 826M31
Diameter: ___ mm
Length: ___ mm
Condition: ___
Finish: ___
Quantity: ___ kg / pieces
Application: ___
Testing/Documentation: ___
For shaft, gear, pump, hydraulic or heavy-engineering requirements, include the component application so the quotation can be prepared against the appropriate material requirement.