Purohit Steel is a leading Grade VR 300 Stockist and Exporter serving Mumbai, supplying NLMK Verona VR 300 pre-hardened plastic mould steel directly from our warehouse in Vasai East and our sales outlet in Mumbai city, with verified chemical composition, mechanical properties and full traceability for Mumbai-region mould makers, OEMs and tooling houses.
As an authorized stockist of NLMK Verona and an ISO-certified company established in 1965, we hold ready stock of Grade VR 300 in round bar, flat bar and block form close to Mumbai, with in-house bandsaw cutting, machining, grinding, drilling, gun drilling, EDM and wire-cut support for fast local turnaround.
Table of Contents
- 1. What is Grade VR 300 Steel
- 2. Why Purohit Steel for VR 300
- 3. Local Supply from Vasai & Mumbai
- 4. Comparison: VR 300 vs 1.2311 vs 1.2738
- 5. Chemical Composition
- 6. Mechanical Properties
- 7. Physical & Thermal Properties
- 8. Through-Hardening & Polishability
- 9. Heat Treatment Guidelines
- 10. Available Forms & Sizes
- 11. Machining & Selection Notes
- 12. Applications & Uses
- 13. Industries We Serve
- 14. Related Products
- 15. Authorized Stockist Brands
- 16. Cities We Supply Across Maharashtra & India
- 17. Our Services
- 18. Frequently Asked Questions
- 19. About Purohit Steel
What is Grade VR 300 Steel?
Grade VR 300 is a pre-hardened chromium-manganese-molybdenum-nickel (Cr-Mn-Mo-Ni) plastic mould steel from the NLMK Verona VR Tool Steels range. It is produced via EAF-LF-VD refining, forging, rolling and quench-and-temper heat treatment, and supplied in accordance with EN 10228-3 Class 4 and SEP 1921 Class E/e internal-soundness standards.
VR 300 is delivered in a quenched-and-tempered (pre-hardened) condition of approximately 280-325 HB (29-35 HRC), so it can be machined directly without further heat treatment. Its manufacturing process is specifically optimised to give uniform hardness through sections up to 700mm thick, along with high polishability, high machinability, excellent suitability for texturing and increased thermal conductivity compared to standard P20-family steels.
Note: “VR 300” is Purohit Steel's supply designation for this NLMK Verona VR Tool Steels product — it is not itself a DIN or AISI/SAE standard number. Based on its chemical composition it belongs to the same general family as 1.2311 (P20) and 1.2738 (P20+Ni) pre-hardened plastic mould steels; see the comparison table below for how it differs from those grades.
Why Purohit Steel for Grade VR 300
- 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 directly through NLMK Verona, the manufacturer of the VR Tool Steels range, 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 family comparison against 1.2311 / 1.2738
- Local Mumbai Presence: Warehousing in Vasai with a sales outlet in Mumbai city itself
- Export-Ready Packaging: Palletised, moisture-protected packing suitable for both domestic transport and export shipment
Local Supply from Our Vasai Warehouse & Mumbai Outlet
Unlike outstation stockists who quote and ship VR 300 from another state, Purohit Steel's warehousing sits inside the Mumbai Metropolitan Region — in Vasai East — with a dedicated sales outlet in Mumbai city itself. For mould-making and tooling workshops across Mumbai, Thane, Navi Mumbai and the Vasai-Virar industrial belt, that proximity translates into a genuinely shorter supply chain for VR 300 round bar, flat bar and block stock.
- Local dispatch: Stock held at the Vasai warehouse can typically be arranged for pickup or local transport faster than material routed from an outstation depot.
- Mumbai sales outlet: Discuss grade selection, hardness requirements and section sizes with our technical team in person at our Mumbai outlet, without waiting on a remote quotation cycle.
- Serving the local tooling cluster: We regularly supply mould-making and precision-engineering workshops in and around Kandivali, Andheri, Bhiwandi, Vasai-Virar, Thane and Navi Mumbai.
- In-house finishing near you: Bandsaw cutting, machining, grinding, drilling, gun drilling, EDM and wire-cut services are carried out at our own facility, so blocks can be collected finished rather than sub-contracted out.
- Urgent replacement stock: For breakdown or urgent tooling repair needs, our Vasai stockholding reduces the wait compared to sourcing VR 300 from outside Maharashtra.
Comparison: VR 300 vs 1.2311 (P20) vs 1.2738 (P20+Ni)
Buyers often need to choose between related pre-hardened plastic mould steel grades. The table below compares VR 300 against two other grades Purohit Steel stocks, to help select the right material for the application.
| Factor | VR 300 | 1.2311 (P20) | 1.2738 (P20+Ni) |
|---|---|---|---|
| Key alloying difference | Cr-Mn-Mo + Ni (0.6%), optimised process | Base Cr-Mn-Mo, no Ni | Cr-Mn-Mo + higher Ni (~1%) |
| Supply hardness | 280-325 HB (29-35 HRC) | 280-325 HB (29-33HRC) | 300-340 HB |
| Through-hardening | Uniform hardness to 700mm section | Good up to medium sections | Excellent, ideal for large blocks |
| Thermal conductivity (20°C) | ~40 W/(m·K), published mill data | ~34 W/(m·K) | Comparable to 1.2311 |
| Polishability / texturing | High — rated polishing range to Ra 0.03µm | Good | Good |
| Best suited for | Large mould blocks needing surface finish, thermal performance and texturing | Small to medium moulds, general tooling | Large mould blocks needing deep, uniform core hardness |
Grade VR 300 Chemical Composition
Typical composition per the NLMK Verona VR 300 technical datasheet (weight %):
| Element | Symbol | Composition (%) |
|---|---|---|
| Carbon | C | 0.37 |
| Manganese | Mn | 1.40 |
| Silicon | Si | 0.20 |
| Chromium | Cr | 1.8 |
| Molybdenum | Mo | 0.2 |
| Nickel | Ni | 0.6 |
| Phosphorus | P | 0.010 max |
| Sulphur | S | 0.003 max |
| Iron | Fe | Balance |
Mechanical Properties of Grade VR 300
Typical values in the as-supplied, pre-hardened (quenched & tempered) condition at 280-325 HB:
| Property | Typical Value |
|---|---|
| Hardness (supply condition) | 280 - 325 HB (approx. 29 - 35 HRC) |
| Tensile Strength (Rm) | ~1000 - 1100 MPa (indicative, at supply hardness) |
| Yield Strength (Rp0.2) | ~750 - 850 MPa (indicative, at supply hardness) |
| Elongation at Break (A5) | ~14 - 18% (indicative, at supply hardness) |
| Modulus of Elasticity (E) | ~205 GPa (20°C) |
Tensile, yield and elongation figures are indicative values read from the manufacturer's tempering-curve / mechanical-property charts at the standard 280-325 HB supply hardness, 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 | 20°C | 100°C | 250°C | 500°C |
|---|---|---|---|---|
| Thermal Expansion Coefficient (×10-6/K) | 11.0 | 11.6 | 12.1 | 13.8 |
| Thermal Conductivity (W/(m·K)) | 40.0 | 39.3 | 38.4 | 35.2 |
| Young's Modulus (GPa) | 205 | 201 | — | — |
Reference values per the NLMK Verona VR 300 technical datasheet. Density is typically ~7.85 g/cm³, standard for this class of alloy steel.
Through-Hardening & Polishability
VR 300's manufacturing process is designed to deliver an optimised balance of chemical composition and processing so that hardness stays uniform through very thick sections. Manufacturer hardness-distribution data on a 700mm-thick block shows hardness staying within a tight band — roughly 305-330 HB near the surface, gently tapering to around 290 HB at 400mm depth — meaning large mould bases retain consistent machinability and mechanical performance from surface to core.
The steel also carries a published polishing range from VR01 (rough grinding) to VR13 (dry diamond polishing, achieving Ra 0.03 µm / mirror finish), and is validated for standard mould texturing processes — a genuine advantage for automotive interior/exterior trim and consumer-facing cosmetic mould surfaces where finish quality is critical.
Internal soundness is certified to EN 10228-3 Class 4 and SEP 1921 Class E/e. As noted above, VR 300 is Purohit's supply name for this NLMK Verona product and is not a DIN/AISI equivalence claim.
Heat Treatment Guidelines
| Process | Temperature | Holding Time | Cooling | Notes |
|---|---|---|---|---|
| Supply condition | Quenched & tempered (pre-hardened) 280-325 HB — ready to machine, no further heat treatment normally required | |||
| Annealing | 650 - 700°C | Min. 2 min/mm | Air or furnace | To obtain <250 HB (24 HRC) and improve machinability |
| Hardening | 860 - 900°C | Min. 1 min/mm | Polymer quench | — |
| Stress relieving | 500 - 550°C | Min. 2 min/mm | Air or furnace | Carry out after machining to remove residual stress |
| Tempering | 530 - 610°C | Min. 3 min/mm | Air or furnace | Carry out after hardening; 2nd temper max 30°C below 1st |
Available Forms & Sizes
- Round Bars
- Flat Bars / Plates
- Blocks (up to heavy sections, given VR 300's through-hardening to 700mm)
- 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 in Vasai, so blocks can be collected close to finished dimensions without sub-contracting to a third party.
Machining & Selection Notes
- Cutting tools: At 280-325 HB, VR 300 machines well with standard HSS or coated carbide tooling at moderate cutting speeds, with good chip control from its clean, homogeneous microstructure.
- Deep cavity work: Because hardness stays consistent through very thick sections, deep-cavity roughing and finishing passes behave predictably even close to the block core.
- Texturing & polishing: Plan final surface finishing using the VR01-VR13 polishing sequence appropriate to the required roughness (Ra), and confirm the texturing pattern with your mould designer before final machining allowances are set.
- EDM finishing: The pre-hardened condition is well suited to EDM cavity sinking without further heat-treatment concerns.
- Grade selection: Choose VR 300 where thick-section uniformity, thermal performance and cosmetic surface finish matter most; see the comparison table above against 1.2311 and 1.2738.
Applications of Grade VR 300 Steel
Per the manufacturer's own positioning, VR 300 is intended for plastic dies requiring excellent surface finishing, compression moulding, plastic injection moulds, and automotive-industry moulds requiring texturing. Purohit Steel supplies it to mould shops across the Mumbai region for the following applications:
- Plastic injection moulds (medium to large size)
- Compression moulding tools
- Blow moulds
- Automotive interior and exterior moulds requiring texturing
- Tooling plates and mould base components
- Consumer product and packaging moulds needing a high-quality finish
Grade VR 300 for Mould Making
In mould making, VR 300 is preferred where large mould blocks need consistent hardness and machinability throughout their thickness, along with a mirror-quality polishable and texturable cavity surface.
Automotive Industry
VR 300 is used for dashboards, interior trim, bumpers and other precision plastic components where surface finish, texture reproduction and dimensional stability across a large mould base are critical — a significant share of India's automotive-ancillary mould-making capacity sits within the greater Mumbai and Pune corridor that Purohit Steel serves.
Industries We Serve
- Automotive industry
- Plastic injection moulding industry
- Packaging manufacturing
- Consumer goods production
- Electrical component manufacturing
- Engineering & tooling workshops
Authorized Stockist
Cities We Supply Across Maharashtra & India
Beyond our home base of Mumbai and the Vasai-Virar belt, we supply Grade VR 300 steel across major industrial cities including 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, with our operational base in the Mumbai Metropolitan Region.
As an ISO-certified company, we source premium materials from globally reputed manufacturers, including as an authorized stockist of NLMK Verona, and operate a modern warehousing facility in Vasai along with a sales outlet in Mumbai, enabling efficient storage, fast processing and timely delivery to Mumbai-region customers and 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 mould-making industry.
Read more about Purohit Steel, view our certifications, or get in touch with our technical sales team.