Purohit Steel is a leading Grade EN41B Stockist and Exporter in India, supplying premium chromium-aluminium-molybdenum nitriding steel (41CrAlMo7 / W.Nr 1.8509) with verified chemical composition, mechanical properties and full traceability for gear makers, hydraulic equipment manufacturers and precision engineering workshops.
As an ISO-certified company established in 1965, we maintain ready stock of Grade EN41B in round bar, flat bar and block form, with in-house bandsaw cutting, machining, grinding and EDM support for fast turnaround across India and export markets.
Table of Contents
- 1. What is Grade EN41B Steel
- 2. Why Purohit Steel for EN41B
- 3. Comparison: EN41B vs EN36 vs EN19
- 4. Chemical Composition
- 5. Mechanical Properties
- 6. Physical & Thermal Properties
- 7. Equivalent International Grades
- 8. Heat Treatment Guidelines
- 9. Available Forms & Sizes
- 10. Machining & Selection Notes
- 11. Applications & Uses
- 12. Industries We Serve
- 13. Related Products
- 14. Authorized Stockist Brands
- 15. Cities We Supply in India
- 16. Our Services
- 17. Frequently Asked Questions
- 18. About Purohit Steel
- Our Certifications
- Countries We Export Worldwide
- Export Packaging & Shipping
- Quality Inspection & Testing
- Latest Price List
- MOQ & Payment Terms
- People Also Search For
What is Grade EN41B Steel?
Grade EN41B (BS 970 designation, internationally known as 41CrAlMo7, Werkstoffnummer 1.8509) is a chromium-aluminium-molybdenum nitriding steel. The aluminium content is the key alloying feature: during gas nitriding, aluminium forms very hard, fine aluminium-nitride precipitates in the surface layer, giving EN41B one of the highest attainable nitrided case hardnesses of any commonly stocked engineering steel.
EN41B is normally supplied hardened and tempered to a core condition of approximately 700-850 MPa (201-255 HB), in which it machines readily. After final machining, components are gas nitrided at a relatively low temperature (approx. 500-520°C), raising surface hardness to roughly 900-1100 HV (about 65-68 HRC) while the tough core hardness is retained.
Because nitriding is a low-temperature diffusion process rather than a quench-hardening process, EN41B components can be finish-machined or ground very close to final size before treatment, resulting in minimal distortion — a key advantage over case-hardening (carburizing) steels for precision parts.
Note: EN41B is often compared with case-hardening grades such as EN36, which use a different surface-hardening mechanism — see the comparison table below.
Why Purohit Steel for Grade EN41B
- Ready Stock: Round bar, flat bar and block sizes held in inventory for immediate dispatch
- ISO-Certified Quality: Documented quality management since 1965
- Authorized Stockist: Sourced through globally reputed manufacturers, including NLMK Verona and SeAH CSS
- Value-Added Machining: In-house bandsaw cutting, precision machining, grinding, drilling, gun drilling, EDM and wire-cut
- Technical Support: Assistance with grade selection, heat treatment guidance and equivalence mapping
- Pan-India & Export Supply: Warehousing in Vasai with a sales outlet in Mumbai, serving customers across India and international markets
- Export-Ready Packaging: Palletised, moisture-protected packing suitable for both domestic transport and export shipment
Comparison: EN41B vs EN36 vs EN19
EN41B, EN36 and EN19 all provide hard, wear-resistant working surfaces on tough alloy steel components, but achieve this through three different metallurgical routes. The table below compares them to help select the right process and grade for the application.
| Factor | EN41B (Nitriding) | EN36 (Case-Hardening) | EN19 (Through-Hardening) |
|---|---|---|---|
| Surface-hardening method | Gas nitriding (diffusion, ~500-520°C) | Carburizing + quench hardening (~900°C) | None — uniform through-hardness |
| Typical case/surface hardness | 900-1100 HV (~65-68 HRC) | 58-62 HRC (case) | Not case hardened |
| Core hardness | 201-277 HB (tough) | Tough, low-carbon core | 248-302 HB uniform |
| Distortion after treatment | Very low (low process temperature) | Higher (quench from ~900°C) | N/A |
| Best suited for | Precision gears, spindles, hydraulic components needing very high surface hardness with minimal distortion | Gears and shafts needing a deep, tough case for heavy contact loads | Medium-to-heavy shafts and gears not requiring a separate hard surface |
| Relative process cost | Medium-High | Medium | Lowest |
Grade EN41B Chemical Composition
Composition as per BS 970 EN41B / DIN 41CrAlMo7 (typical mill range, weight %):
| Element | Symbol | Composition (%) |
|---|---|---|
| Carbon | C | 0.35 - 0.45 |
| Silicon | Si | 0.10 - 0.45 |
| Manganese | Mn | 0.40 - 0.65 |
| Chromium | Cr | 1.40 - 1.80 |
| Molybdenum | Mo | 0.10 - 0.25 |
| Aluminium | Al | 0.90 - 1.30 |
| Phosphorus | P | 0.035 max |
| Sulphur | S | 0.035 max |
| Iron | Fe | Balance |
Mechanical Properties of Grade EN41B
Typical values in the hardened & tempered (pre-nitriding) core condition:
| Property | R Condition | S Condition |
|---|---|---|
| Hardness | 201 - 255 HB | 223 - 277 HB |
| Tensile Strength (Rm) | 700 - 850 MPa | 775 - 925 MPa |
| Yield Strength (Rp0.2) | 480 MPa min | 525 MPa min |
| Elongation at Break (A) | 16% min | 14% min |
| Nitrided Surface Hardness | 900 - 1100 HV (approx. 65 - 68 HRC) | |
Values are typical for material supplied in the hardened & tempered core condition and can vary with section size and mill batch. Mill test certificates (EN 10204 2.2 / 3.1) are available on request.
Physical & Thermal Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Thermal Conductivity (room temp.) | ~30 - 36 W/(m·K) |
| Coefficient of Thermal Expansion (20-200°C) | ~11 - 12 × 10-6 /K |
| Specific Heat Capacity | ~460 J/(kg·K) |
| Modulus of Elasticity (E) | ~210 GPa |
Equivalent International Grades
| Country / Standard | Designation |
|---|---|
| UK (BS 970) | EN41B |
| Germany (DIN, Werkstoffnummer) | 41CrAlMo7 (1.8509) |
| France (AFNOR) | 40CAD6.12 |
| China (GB) | 38CrMoAl |
EN41B is a dedicated nitriding grade and is not interchangeable with case-hardening steels such as EN36 — see the comparison table above.
Heat Treatment Guidelines
| Process | Guideline |
|---|---|
| Supply condition | Hardened & tempered core, 201-255 HB (R condition) — readily machinable |
| Stress relieving (after heavy machining) | 600-650°C, hold, air cool |
| Core hardening | Austenitize at 880-930°C, oil quench |
| Tempering | 600-680°C — must be tempered above the intended nitriding temperature to preserve core properties during nitriding |
| Gas nitriding | Approx. 500-520°C for 20-100+ hours depending on required case depth, giving approx. 900-1100 HV (65-68 HRC) surface hardness |
Available Forms & Sizes
- Round Bars
- Flat Bars / Plates
- Blocks
- Custom sizes cut to drawing via in-house bandsaw cutting
Material is machined, ground, drilled and finished in-house through our precision machining, grinding, drilling, gun drilling, EDM and wire-cut facilities, so components can be supplied close to finished dimensions before nitriding.
Machining & Selection Notes
- Machining sequence: Machine or grind components close to final size in the hardened & tempered core condition, then nitride last — the low nitriding temperature minimises further distortion.
- Tempering temperature: Always ensure the core tempering temperature is above the planned nitriding temperature, otherwise core hardness and strength will drop during the nitriding cycle.
- Case depth control: Nitriding time and temperature control case depth; deeper cases require longer cycles and should be specified based on expected contact stress.
- Grade selection: Choose EN41B where very high surface hardness and minimal distortion are essential; choose EN36 where a deeper, tougher case is needed for heavy contact loads; choose plain EN19 where no separate hard surface is required — see the comparison table above.
Applications of Grade EN41B Steel
EN41B is used wherever a component needs a very hard, wear-resistant working surface with minimal distortion and a tough supporting core, across mould making, gear manufacturing and precision hydraulic engineering.
- Gears, pinions and gear shafts
- Camshafts and cam followers
- Valve stems and valve guides
- Hydraulic cylinder rods and pistons
- Precision spindles and bushings
- Injection moulding equipment components
- Connecting rods and small extruder screws
- Wear plates and guide rails
EN41B for Mould Making
In mould making, EN41B is used for cavity inserts, guide components and wear surfaces where a very high, localised surface hardness is required without the distortion risk of a full quench-hardening cycle.
Automotive & Hydraulic Applications
EN41B is widely specified for camshafts, transmission components, hydraulic cylinder rods and other parts subject to sliding wear and repeated contact stress.
Industries We Serve
- Automotive industry
- Gear & transmission manufacturing
- Hydraulics & pneumatics
- Plastic injection moulding industry
- Precision engineering & machine tools
- Engineering & tooling workshops
Authorized Stockist
Grade EN41B Supply Locations Across India
We supply Grade EN41B steel across major industrial cities including Mumbai, Pune, Khopoli, Nashik, Aurangabad, Navi Mumbai, Palghar, Umbergaon, Vapi, Valsad, Daman, Vadodara, Ahmedabad, Rajkot, Hyderabad, Bangalore, Chennai, Cochin, Delhi, Gurgaon, Manesar and Sonipat — as well as to export markets.
Our Steel Products
Our Services
Frequently Asked Questions
About Purohit Steel
Purohit Steel was established in 1965 by Shree Bherumalji Rajpurohit, a visionary in metallurgy. Over the decades, we have built a strong reputation as a trusted stockist and exporter of tool steel, plastic mould steel and engineering steel products across India.
As an ISO-certified company, we source premium materials from globally reputed manufacturers and operate a modern warehousing facility in Vasai along with a sales outlet in Mumbai, enabling efficient storage, fast processing and timely delivery across India and export markets.
With decades of relationships with tool & die manufacturers and a customer-focused approach, Purohit Steel continues to deliver reliable, technically supported steel solutions for the engineering industry.
Read more about Purohit Steel, view our certifications, or get in touch with our technical sales team.
Our Certifications
Purohit Steel operates as an ISO-certified company, backed by documented quality management, safety and compliance certifications that support reliable supply to domestic and export customers.
View all certificates in detail on our Certifications page.
Countries We Export Worldwide
Beyond India, Purohit Steel exports tool & mould steel grades to customers across the following countries and regions:
| Export Destinations | |||||
|---|---|---|---|---|---|
| UAE | Saudi Arabia | Oman | Bangladesh | Sri Lanka | Nepal |
| Vietnam | Thailand | Indonesia | Kenya | Nigeria | South Africa |
For export enquiries and destination-specific documentation, please contact our sales team.
Export Packaging & Shipping
Bars, flats and blocks are packed to withstand handling, transit and marine shipment, whether for domestic dispatch or export orders.
- Palletised and strapped packing for round bars, flat bars and blocks
- Moisture-protected wrapping to prevent surface corrosion in transit
- Seaworthy export packing with clear shipping marks and material identification
- Documentation support including packing lists, invoices and mill test certificates for customs clearance
- Shipment by road, rail or sea freight as per order requirement and destination
Quality Inspection & Testing
Every batch held in our stock is checked through documented inspection procedures before dispatch, so mould makers and OEMs receive material with verified, traceable quality.
- Chemical composition verification against mill certificates
- Hardness testing (Brinell / Rockwell) on received stock
- Dimensional inspection as per standard bar and block tolerances
- Visual and surface defect inspection
- EN 10204 2.2 / 3.1 mill test certificates provided on request
- Third-party inspection coordination available for export orders
Full material traceability is maintained from incoming stock through to dispatch for every order.
Latest Price List
Pricing depends on section size, quantity, form (round bar / flat bar / block) and current raw material rates. Indicative guidance is below — contact us for a firm, up-to-date quotation.
| Form | Typical Price Basis |
|---|---|
| Round Bar | Per Kg, based on diameter & length — contact for latest rate |
| Flat Bar / Plate | Per Kg, based on thickness & size — contact for latest rate |
| Block (cut to size) | Per Kg / Per Piece, based on drawing — contact for latest rate |
Prices are subject to change with raw material and freight costs. Share your required size and quantity via the quotation form or WhatsApp for the latest price.
MOQ & Payment Terms
Minimum Order Quantity: Flexible MOQ depending on size and form — from small trial quantities for tooling houses up to bulk orders for OEMs, subject to confirmation at enquiry stage.
Payment Terms: Advance payment / part-advance with balance before dispatch for domestic orders; T/T (bank transfer) or Letter of Credit (LC) for export orders, depending on order value and destination.