EN8 / 080M40 Medium Carbon Steel
EN8 Round Bar Manufacturer in India
EN8 medium-carbon steel round bars for shafts, axles, pins, studs, machined parts and general engineering applications.
EN8 Round Bar Manufacturer & Supplier
Jain Steels Group manufactures and supplies EN8 round bars for automotive, forging, machining, machinery and general engineering requirements. EN8 is commonly identified as 080M40 and is an unalloyed medium-carbon engineering steel selected where greater strength than ordinary mild steel is required.
Our EN8 round bars can be supplied within the published 25–66 mm diameter range, with final availability confirmed against the required diameter, length, tolerance, surface condition, heat-treatment condition, testing scope and quantity.
- Grade identification: EN8 / 080M40
- Suitable for shafts, axles, pins, studs and machined components
- Custom cut lengths and order-specific tolerances
- Chemistry and dimensional verification as agreed
- Mechanical testing and additional inspection on request
- Traceable supply documentation subject to purchase specification
What Is EN8 Steel?
EN8 is the legacy British designation commonly associated with 080M40. It is a medium-carbon steel with a typical specified carbon range of 0.36–0.44%. The grade offers a practical balance of strength, machinability and heat-treatment response for many engineering components.
EN8 can be used in an untreated condition or processed through normalising, hardening and tempering, flame hardening or induction hardening when the component design and section size permit. Final properties depend on the delivery condition, ruling section and heat-treatment cycle.
Medium Carbon Grade
Designed for engineering parts requiring higher strength than ordinary low-carbon mild steel.
Machining Performance
Readily machinable in suitable supply conditions using appropriate tooling and cutting parameters.
Heat-Treatable
May be normalised or hardened and tempered, subject to section size and specified final properties.
Surface Hardening
Flame or induction hardening may be used to improve surface hardness and moderate wear resistance.
EN8 Chemical Composition
The following composition reflects commonly referenced BS 970 data for 080M40. The approved purchase specification and material test certificate must be used for final acceptance.
| Element | Symbol | Specified Range / Maximum |
|---|---|---|
| Carbon | C | 0.36–0.44% |
| Silicon | Si | 0.10–0.40% |
| Manganese | Mn | 0.60–1.00% |
| Sulphur | S | 0.050% maximum |
| Phosphorus | P | 0.050% maximum |
Mechanical Properties of EN8 Steel
Mechanical properties vary with bar diameter, ruling section, delivery condition and heat treatment. The table below provides an illustrative BS 970 data-sheet reference and should not replace the agreed purchase specification.
| Reference Condition | Limiting Ruling Section | Hardness | Tensile Strength | Yield Strength | Elongation |
|---|---|---|---|---|---|
| Normalised | 150 mm | 152–207 BHN* | 550 MPa minimum | 280 MPa minimum | 16% minimum |
| Q condition | 63 mm | 179–229 BHN | 625–775 MPa | 385 MPa minimum | 16% minimum |
*Normalised hardness is guidance in the referenced data sheet. Specify the required condition and acceptance values on the enquiry and purchase order.
EN8 Round Bar Technical Specifications
| Parameter | Details |
|---|---|
| Product | EN8 Medium Carbon Steel Round Bars |
| Grade Designation | EN8 / 080M40 |
| Material Family | Unalloyed Medium Carbon Engineering Steel |
| Published Diameter Range | 25 mm – 66 mm; final availability subject to enquiry |
| Length | Custom lengths subject to manufacturing and order requirements |
| Possible Supply Conditions | As rolled, as forged, normalised or heat-treated condition; confirm on enquiry |
| Surface / Processing | Black, peeled, turned or other agreed condition subject to availability |
| Testing | Chemical, dimensional, hardness and mechanical testing as specified |
| Documentation | Material test certificate and traceability documents as agreed |
| Applications | Automotive, forging, machining, machinery and general engineering |
Key Features of EN8 Round Bars
Balanced Strength
Offers higher strength than ordinary mild steel for many general engineering parts.
Reliable Machinability
Suitable for turning, drilling, milling and other machining operations in an appropriate condition.
Controlled Chemistry
Grade chemistry can be verified against the agreed specification and material test certificate.
Heat-Treatment Response
Can be processed to achieve an application-specific balance of strength, hardness and ductility.
Custom Requirements
Diameter, length, tolerance, condition and inspection can be reviewed against the buyer’s drawing.
Industrial Supply
Suitable for production buyers in automotive, forging, machinery and engineering sectors.
Applications of EN8 Round Bars
Shafts & Axles
Used for general-purpose shafts, motor shafts, axles and rotating components subject to engineering approval.
Studs & Bolts
Suitable for heat-treated studs, bolts and fastener components where the specified properties are achievable.
Pins & Spindles
Used for machined pins, spindles, keys and load-carrying engineering parts.
Connecting Components
Applied in connecting rods, couplings, brackets, housings and related machinery components.
Automotive Parts
Used in selected automotive components based on design, heat treatment and inspection requirements.
General Engineering
Suitable for rollers, machine parts, forged components and precision-machined assemblies.
Manufacturing & Quality Process
Why Choose Jain Steels Group?
- Dedicated round bar manufacturing capabilities
- Order-specific review of grade, size and condition
- Dimensional and chemistry verification
- Mechanical testing as per agreed requirements
- Custom lengths and production quantities
- Traceability and documentation support
- Supply support for industrial buyers across India
- Technical coordination for repeat requirements
Frequently Asked Questions
What is EN8 round bar?
EN8, commonly designated 080M40, is an unalloyed medium-carbon engineering steel used where higher strength than mild steel is required for shafts, axles, pins, studs, bolts and machined parts.
What is the carbon content of EN8 steel?
A commonly referenced BS 970 composition range specifies approximately 0.36–0.44% carbon. Final acceptance must follow the agreed specification and material test certificate.
Can EN8 round bars be heat treated?
Yes. EN8 can be normalised and may be hardened and tempered or surface hardened. Achievable properties depend on bar diameter, ruling section and the heat-treatment process.
What sizes of EN8 round bars are available?
Jain Steels Group’s published round bar range is 25–66 mm. Share the required diameter, length, condition and quantity so availability can be confirmed.
What should I share for an EN8 quotation?
Share EN8/080M40 as the grade, required standard, diameter, length, quantity, delivery condition, tolerance, mechanical properties, testing requirements and delivery location.
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