Purohit Steel is a leading Grade EN47 Stockist and Exporter in India, supplying premium chromium-vanadium spring steel (BS 970 735A50 / 50CrV4) with verified chemical composition, mechanical properties and full traceability for spring manufacturers, mould makers and engineering workshops.
As an ISO-certified company established in 1965, we maintain ready stock of Grade EN47 in round bar and flat bar 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 EN47 Steel
- 2. Why Purohit Steel for EN47
- 3. Comparison: EN47 vs EN9 vs EN24
- 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 EN47 Steel?
Grade EN47 (BS 970 designation 735A50, internationally known as 50CrV4 / 51CrV4) is a chromium-vanadium spring steel. The vanadium addition refines grain structure and improves hardenability and toughness compared with plain-carbon spring steels, giving EN47 excellent elasticity, fatigue resistance and shock resistance under repeated dynamic loading.
EN47 is normally supplied in the annealed or as-rolled condition (approx. 197-255 HB) for ease of machining and forming, then oil-hardened and tempered by the end user to develop spring properties. In the hardened & tempered condition it typically reaches 45-55 HRC, corresponding to a tensile strength in the region of 1550-1900 MPa depending on the tempering temperature chosen.
Because the tempering temperature directly controls the final balance of hardness, elasticity and toughness, EN47 components are always tempered promptly after quenching, while still warm, to reduce the risk of quench cracking.
Note: EN47 is a dedicated spring/fatigue-duty grade and is not a substitute for plain-carbon or higher-alloy structural grades — see the comparison table below.
Why Purohit Steel for Grade EN47
- Ready Stock: Round bar and flat bar 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: EN47 vs EN9 vs EN24
EN47 is purpose-built for dynamic, fatigue-loaded spring applications, unlike general-purpose engineering grades. The table below compares it against two other EN-series grades Purohit Steel stocks, to help select the right material for the application.
| Factor | EN47 (735A50) | EN9 (070M55) | EN24 (817M40) |
|---|---|---|---|
| Type | Cr-V spring steel | Unalloyed high carbon steel | Ni-Cr-Mo alloy steel |
| Primary design intent | Repeated dynamic / fatigue loading (springs) | Static or low-cycle shafts, gears | High-strength, high-fatigue structural components |
| Hardness (hardened & tempered) | 45-55 HRC | ~200-250 HB (rarely fully hardened) | 269-321 HB (Q/T) |
| Tensile strength (H&T) | 1550-1900 MPa | 700-900 MPa | 850-1000+ MPa |
| Elastic / fatigue behaviour | Excellent (purpose-designed for springs) | Limited | Good, but not spring-optimised |
| Best suited for | Leaf/coil springs, die springs, dynamically loaded components | General shafts, gears, medium-wear components | Heavy-duty shafts, gears, aerospace/automotive high-stress parts |
Grade EN47 Chemical Composition
Composition as per BS 970 735A50 (typical mill range, weight %):
| Element | Symbol | Composition (%) |
|---|---|---|
| Carbon | C | 0.45 - 0.55 |
| Silicon | Si | 0.10 - 0.35 |
| Manganese | Mn | 0.60 - 0.90 |
| Chromium | Cr | 0.90 - 1.20 |
| Vanadium | V | 0.15 min |
| Phosphorus | P | 0.040 max |
| Sulphur | S | 0.040 max |
| Iron | Fe | Balance |
Mechanical Properties of Grade EN47
Typical values across the common supply and heat-treated conditions:
| Property | Annealed (Supply) | Hardened & Tempered (Spring) |
|---|---|---|
| Hardness | 197 - 255 HB | 45 - 55 HRC |
| Tensile Strength (Rm) | — | 1550 - 1900 MPa |
| Yield Strength (Rp0.2) | — | 1300 - 1600 MPa |
| Elongation at Break (A) | — | 6 - 10% |
| Impact Toughness (Charpy V) | — | 15 - 25 J |
| Modulus of Elasticity (E) | ~206 GPa | |
Values for the hardened & tempered condition vary significantly with tempering temperature and section size — higher tempering temperatures reduce hardness and tensile strength but improve toughness. 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.) | ~38 - 42 W/(m·K) |
| Coefficient of Thermal Expansion (20-200°C) | ~12 × 10-6 /K |
| Specific Heat Capacity | ~460 J/(kg·K) |
Equivalent International Grades
| Country / Standard | Designation |
|---|---|
| UK (BS 970) | EN47 / 735A50 |
| Germany (DIN, Werkstoffnummer) | 50CrV4 / 51CrV4 (1.8159) |
| USA (AISI / SAE) | 6150 |
| Japan (JIS) | SUP10 |
| France (AFNOR) | 50CV4 |
EN47 is closely related to, but not identical across every standard to, DIN 50CrV4 / 51CrV4 — minor composition differences exist between the BS and DIN specifications.
Heat Treatment Guidelines
| Process | Guideline |
|---|---|
| Supply condition | Annealed / as-rolled, approx. 197-255 HB — machinable and formable |
| Stress relieving | 600-650°C, hold, air cool |
| Annealing (softening) | Heat to 820-840°C, soak, cool slowly in the furnace |
| Hardening | Preheat 650-700°C, then austenitize at 830-860°C, oil quench |
| Tempering | 400-600°C depending on target hardness — temper promptly while parts are still warm from quenching to reduce cracking risk; gives approx. 45-55 HRC |
Available Forms & Sizes
- Round Bars
- Flat Bars
- 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.
Machining & Selection Notes
- Machining: EN47 machines best in the annealed/as-rolled condition (197-255 HB) with standard HSS or carbide tooling; hardening and tempering are normally carried out after machining and forming.
- Tempering control: Final hardness, elasticity and toughness are set by the tempering temperature — lower tempering temperatures give higher hardness/strength but reduced toughness, and vice versa.
- Quench cracking risk: Because of the relatively high carbon and alloy content, parts should be tempered immediately after quenching while still warm.
- Grade selection: Choose EN47 specifically for springs and dynamically/fatigue-loaded parts; use EN9 for simpler statically loaded shafts, or EN24 where very high structural strength (rather than spring elasticity) is the priority — see the comparison table above.
Applications of Grade EN47 Steel
EN47 is the preferred choice wherever a component must flex repeatedly and return to shape without fatigue failure, spanning automotive suspension, mould tooling and general spring manufacturing.
- Leaf springs and coil springs
- Spring washers and circlips
- Die and mould ejector / return springs
- Shafts and axles subjected to torsional fatigue
- Steering knuckles and suspension components
- Gears, pinions and spindles under repetitive stress
- Mechanical linkages and connecting rods
- Rollers, levers and press components
EN47 for Mould Making
In mould and die making, EN47 is used for die springs, ejector return springs and other fatigue-loaded components that must retain their elastic properties over long production runs.
Spring Manufacturing & Automotive Suspension
EN47 is extensively used for leaf and coil springs in automotive suspension systems and heavy machinery, where its high elastic limit and fatigue resistance ensure long service life under continuous dynamic loading.
Industries We Serve
- Automotive suspension & spring manufacturing
- Mould & die making
- Agricultural machinery
- General engineering & machinery
- Railway & heavy transport equipment
- Engineering & tooling workshops
Authorized Stockist
Grade EN47 Supply Locations Across India
We supply Grade EN47 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 and spring manufacturing 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.