Purohit Steel is a trusted automotive mould steel supplier, stockist and exporter in India, established in 1965 by Shree Bherumalji Rajpurohit. We supply the tool & mould steel grades that automotive OEMs and tier-1 mould makers rely on for interior trim, exterior panel, die-casting and stamping tooling — from pre-hardened P20 mould-base steel to hot-work die-casting grades and cold-work stamping die steel.
Automotive tooling has to satisfy demands that many other industries don't face together: very high production volumes, Class-A surface finish on visible interior and exterior parts, dimensional stability across large mould blocks, and, for die-casting and stamping dies, sustained heat and wear resistance. This guide explains what matters when selecting automotive mould steel and gives a straight decision table mapping application to the recommended Purohit Steel grade.
Table of Contents
- 1. What Matters When Choosing Automotive Mould Steel
- 2. Why Purohit Steel for Automotive Mould Steel
- 3. Which Grade Should You Choose
- 4. Hardness & Wear Resistance
- 5. Surface Finish for Visible Automotive Parts
- 6. Corrosion Resistance for Interior/Exterior Components
- 7. Machinability & Lead Time
- 8. Beyond Automotive Moulds
- 9. Applications & Industries
- 10. Related Products
- 11. Authorized Stockist Brands
- 12. Cities We Supply in India
- 13. Our Services
- 14. Frequently Asked Questions
- 15. 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 Matters When Choosing Automotive Mould Steel
Automotive tooling covers a wider spread of demands than almost any other mould-steel application, so the right grade depends heavily on which part of the vehicle programme the tool is for:
- Production volume: Automotive OEM and tier-1 production runs are typically far higher than general industrial moulding, so cavity wear resistance and consistent hardness through repeated cycles directly affect tool life and total cost of ownership.
- Surface finish: Visible interior parts (dashboards, consoles, door trim) and exterior panels (bumpers, grilles) demand a clean, defect-free, highly polishable microstructure, since any cavity imperfection is reproduced on every moulded part.
- Dimensional stability across large blocks: Automotive mould bases and cavity blocks are often large, and the steel must hold uniform hardness and dimensional stability from surface to core to avoid distortion and mismatch over long production runs.
- Heat resistance for die-casting: Aluminium die-casting dies for engine, transmission and structural components see repeated thermal cycling and molten-metal contact, requiring hot-work tool steel engineered to resist heat checking and thermal fatigue.
- Wear resistance for stamping/forging dies: Stamping, blanking and forging dies for automotive body panels and drivetrain components need high wear resistance and edge retention under continuous mechanical loading.
Getting this match wrong shows up later as short mould or die life, rejected cosmetic parts from surface defects, or unplanned downtime replacing tooling mid-programme — all of which cost far more than the steel itself.
Why Purohit Steel for Automotive Mould Steel
- Full Range, One Supplier: Interior-trim mould steel, exterior-panel mould steel, die-casting hot-work grades and stamping-die cold-work grades all stocked under one roof
- Ready Stock: Round bar, flat bar and block sizes held in inventory for immediate dispatch to automotive tool rooms
- 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: Grade-selection guidance based on part type, cavity count, surface finish and expected production volume
- Pan-India & Export Supply: Warehousing in Vasai with a sales outlet in Mumbai, serving automotive tooling customers across India and international markets
Which Grade Should You Choose — Automotive Application to Recommended Grade
Use the table below as a starting point, then confirm against the specific part requirements and production volume on each grade's full technical page.
| Application | Recommended Grade | Link |
|---|---|---|
| Interior trim, dashboards, consoles (injection moulds) | Grade 1.2311 (P20) / 1.2738 (P20+Ni) | 1.2311 / 1.2738 |
| Corrosive/humid interior trim components | Grade 1.2083 ESR | 1.2083 ESR |
| High cavity-count bumper/exterior panel moulds | Grade VR 300 / VR 400 | VR 300 / VR 400 |
| Aluminium die-casting dies for engine/transmission/structural parts | Grade H11/H13 (1.2343/1.2344 ESR) | H11/H13 |
| Stamping & blanking dies for automotive body panels | Grade D2 | D2 |
| Forging dies for automotive drivetrain components | Grade DB6/1.2714 or H21 | H21 |
This is a general guide, not a substitute for reviewing the full chemical composition and mechanical property data on each grade page before finalising a specification.
Hardness & Wear Resistance
Across the automotive mould steel range, hardness is matched to the job rather than maximised across the board. Mould-base and cavity grades — 1.2311, 1.2738, 1.2083 ESR, VR 300 and VR 400 — are supplied pre-hardened at roughly 280-330 HB, giving cavities enough wear resistance for high-volume automotive production while remaining machinable without a separate hardening cycle. Hot-work die-casting grades H11/H13 are typically heat-treated after machining to 44-52 HRC to resist thermal fatigue and heat checking, while cold-work Grade D2 stamping die steel is hardened to 58-62 HRC for maximum edge retention and wear resistance under continuous mechanical loading.
For localised wear resistance on cavity and core surfaces of 1.2311 and 1.2738 mould-base grades, gas or plasma nitriding is commonly applied, raising surface hardness to roughly 55-60 HRC while keeping the core tough — useful for high cavity-count tooling running long production programmes.
Surface Finish for Visible Automotive Parts
Automotive tooling splits into two very different surface-finish requirements. Visible interior parts — dashboards, consoles, door trim — and Class-A exterior panels demand a mirror or near-mirror cavity finish with zero visible defects, since every imperfection is reproduced on every moulded part. This is where ESR (Electro-Slag Remelting) refining matters: the process removes non-metallic inclusions and produces a cleaner, more homogeneous microstructure than conventionally melted steel, which is why 1.2083 ESR is preferred for high-polish interior trim work and VR 400 for demanding exterior panel cavities.
Structural, under-bonnet and die-casting tooling has a different priority: a good functional finish that supports part release and dimensional accuracy is sufficient, and mirror polish is neither required nor cost effective. Standard 1.2311 and 1.2738 take a good working polish well suited to this category, keeping tooling cost proportionate to the finish actually needed.
Corrosion Resistance for Interior/Exterior Components
Base Cr-Mn-Mo mould steels such as 1.2311 and 1.2738 have low inherent corrosion resistance, which is acceptable for dry-environment moulding of commodity interior trim resins but becomes a real risk in specific situations common to automotive tooling:
- Humid or coastal manufacturing plants, where ambient moisture promotes rust and pitting on unprotected cavity surfaces between production runs.
- Water-cooled mould systems, where cooling channels in a base steel are prone to rust and scale build-up over the life of a long-running automotive programme.
- Flame-retardant and certain engineering-plastic interior trim resins, which can release mildly corrosive by-products during moulding that attack unprotected tool steel surfaces over repeated cycles.
For these situations, step up to 1.2083 ESR, an ESR-refined ~13% Cr stainless-type mould steel that combines corrosion resistance with the highest achievable polish — the standard choice for corrosive or humid-environment automotive interior trim tooling. Exterior structural and die-casting tooling generally does not need stainless-level corrosion resistance and continues to use standard mould-base or hot-work grades.
Machinability & Lead Time
Because 1.2311, 1.2738, 1.2083 ESR, VR 300 and VR 400 all arrive pre-hardened, automotive tool rooms can rough and finish-machine large mould blocks directly, without waiting on a heat-treatment cycle or managing the distortion risk that comes with post-machining hardening on large sections. This keeps automotive programme lead times predictable, which matters as much to OEM launch schedules as the steel's raw material cost.
Hot-work die-casting grades (H11/H13) and cold-work stamping grade D2 are supplied in the annealed condition for machining, then heat-treated to final hardness after roughing — a two-stage process that Purohit Steel's in-house machining, grinding and EDM services support end-to-end so tool rooms are not left managing multiple vendors for a single die.
Beyond Automotive Moulds
While this guide is centred on automotive tooling, every grade referenced here also serves general industrial tooling outside the automotive sector. 1.2311 and 1.2738 are widely used across plastic injection moulding for packaging, consumer goods and electrical components; 1.2083 ESR serves medical, food-contact and cosmetic moulding wherever a high-polish, corrosion-resistant cavity is required; and H11/H13 and D2 are standard choices for general die-casting, forging and press-tooling applications well beyond the automotive industry. See our related guides to tool steel for mould making and hot-work tool steel for the broader picture.
Applications & Industries
- Dashboards, consoles and interior trim injection moulds
- Bumpers and exterior panel moulds
- Door trim, pillar trim and other interior component moulds
- Under-bonnet and structural plastic component moulds
- Aluminium die-casting dies for engine, transmission and structural parts
- Stamping and blanking dies for automotive body panels
- Forging dies for automotive drivetrain components
Industries We Serve
- Automotive OEM & tier-1 component manufacturing
- Plastic injection moulding industry
- Die-casting foundries
- Sheet-metal stamping & press-tooling shops
- Forging industry
- Engineering & tooling workshops
Authorized Stockist
Cities We Supply in India
We supply automotive mould steel across major automotive manufacturing hubs and 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, mould steel and engineering steel products across India, including the automotive mould steel grades used by OEM and tier-1 tool rooms nationwide.
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.
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 automotive tooling customers.
View all certificates in detail on our Certifications page.
Countries We Export Worldwide
Beyond India, Purohit Steel exports automotive 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 automotive 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 automotive 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.