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Hot Work vs Cold Work Tool Steel | H13 vs D2 | Virat Steels
In tooling, one decision quietly determines tool life, rejection rate, and production cost: choosing the right tool steel.
Yet many failures on the shop floor come down to one mistake—using hot work steel where cold work is needed, or vice versa.
This guide will give you a clear, practical comparison between hot work and cold work tool steels—so you can make the right decision the first time.
Hot Work Tool Steel (For High Temperature Applications)
The most widely used grade: H13 tool steel
Best For:
- Aluminium die casting
- Forging dies
- Extrusion tools
- High-temperature moulds
Key Benefits:
✔ Handles extreme heat (200–700°C)
✔ Resists thermal cracking
✔ High toughness under load
Cold Work Tool Steel (For Wear Resistance)
A leading grade: D2 tool steel
Best For:
- Blanking & punching dies
- Shear blades
- Cold forming tools
- Sheet metal industry
Key Benefits:
✔ Very high hardness (up to 60+ HRC)
✔ Excellent wear resistance
✔ Long life in cutting operations
Hot Work vs Cold Work Steel — Quick Comparison
| Feature | Hot Work Steel (H13) | Cold Work Steel (D2) |
| Temperature | High | Low |
| Hardness | Medium | Very High |
| Toughness | High | Moderate |
| Wear Resistance | Medium | Very High |
| Heat Resistance | Excellent | Poor |
| Best Use | Die casting, forging | Cutting, punching |
Using the Wrong Steel? Here’s What Happens
- Cold work steel in hot application → Cracks & failure
- Hot work steel in wear application → Rapid wear & loss of accuracy
Result: Downtime, rejection, and higher cost per component
How to Choose the Right Tool Steel
Choose Hot Work Steel if:
- Temperature > 200°C
- Thermal cycling is involved
- Impact load is high
Choose Cold Work Steel if:
- Application is at room temperature
- Wear resistance is critical
- Cutting or shearing is involved
Industry-Wise Recommendation
| Industry | Recommended Steel |
| Die Casting | H13 |
| Forging | H13 / H11 |
| Sheet Metal | D2 |
| Blanking | D2 / D3 |
| Plastic Mould (High Temp) | H13 |
Increase Tool Life — Proven Methods
For Hot Work Steels:
- Use ESR quality material
- Apply nitriding
- Ensure proper preheating
- Control cooling cycles
For Cold Work Steels:
- Maintain correct hardness
- Use coatings (PVD)
- Avoid shock loading
- Ensure lubrication
Virat Steels — Your Tool Steel Partner
At Virat Steels, we help manufacturers reduce failure and increase tool life with the right material selection.
What You Get:
✔ Ready stock (rounds, flats, blocks)
✔ Ultrasonic tested material
✔ Fast delivery across India
✔ Technical guidance (not just supply)
FAQs?
1-Which is better: H13 or D2?
It depends on application.
- High temperature → H13
- High wear → D2
2-Can D2 be used for hot work?
No. D2 tool steel becomes brittle at high temperatures and may crack.
3-Does higher hardness mean better tool life?
Not always. Excess hardness reduces toughness and increases cracking risk.
4-What is the best steel for die casting?
H13 tool steel is the industry standard.
5. How does heat treatment differ between the two?
Hot work steels are heat-treated to maintain strength at high temperatures
Cold work steels are treated to achieve maximum hardness and wear resistance
6. Which is more expensive: hot work or cold work steel?
Hot work steels are often more expensive due to alloying elements and processing required for high-temperature performance.
7. What industries rely heavily on hot work steel?
Automotive forging, Aluminium die casting, Aerospace component manufacturing
8. What industries rely on cold work steel?
Sheet metal fabrication, Tool and die making, Packaging and appliance manufacturing
9. Which steel has longer tool life?
It depends on the application:
- Hot work steel lasts longer in high-temperature application.
- Cold work steel lasts longer in abrasive, low-temperature operations.
Get Expert Recommendation (Free Consultation)
Choosing the right steel can double your tool life.
- Stop tool failures before they happen.
- Choose the right steel with expert guidance from Virat Steels.
Share your application—we’ll recommend:
- Best grade with quality
- Ideal hardness
- Heat treatment process
Talk to our experts today:
🌐 viratsteels.com 📞 +91 98140-21775 ✉info@viratsteels.com
P20 vs H13 — Best Choice for Long-Run Plastic Moulds Plastic Mould Steel · Grade Comparison · Virat Special Steels
A practical, application-first guide for mould makers, tool rooms, and procurement teams choosing between two most popular plastic mould steel grades.
Choosing the wrong mould steel doesn’t just cost money — it costs production runs, surface finish quality, and mould life. Here’s how to pick the right one.
At a Glance: P20 vs H13
The table below gives a side-by-side view of both grades across the most critical properties mould buyers evaluate:
| P20 Steel Pre-hardened Mould Steel | H13 Steel Hot Work Tool Steel |
|---|---|
| Hardness 28–34 HRC (pre-hardened) | Hardness 44–52 HRC |
| Toughness High | Toughness Very High |
| Polishability Good | Polishability Excellent |
| Machinability Excellent | Machinability Moderate |
| Mould Life Up to 5,00,000 shots | Mould Life 10,00,000+ shots |
| Heat Treatment Not required | Heat Treatment Required (vacuum) |
| Tool Cost Lower | Tool Cost Higher |
| Lead Time Short | Lead Time Longer |
Detailed Property Comparison
| Property | P20 Steel | H13 Steel |
|---|---|---|
| Hardness after HT | 28–34 HRC (pre-hardened) | 44–52 HRC |
| Wear Resistance | Moderate | High |
| Toughness | High | Very High |
| Machinability | Excellent (no HT needed) | Moderate (HT required) |
| Thermal Fatigue Resistance | Low | Very High |
| Tool Cost | Lower | Higher |
| Lead Time | Short (ready to machine) | Longer (HT required) |
| Mould Life | Up to 5,00,000 shots | 10,00,000+ shots |
| Corrosion Resistance | Low | Moderate |
Which Steel is Best for Long-Run Moulds?
✅ Choose P20 if:
· Production volume is moderate
· Budget is limited
· Faster delivery is required
· Plastic material is non-abrasive
✅ Choose H13 if:
· Production volume is very high
· You need long mould life
· Material is abrasive or high temperature
· Dimensional stability is critical
| Which Grade Should You Pick? P20 for speed & cost · H13 for volume & finish |
If you need a mould quickly, at a lower cost, for regular plastics and medium production, go with P20.But if you’re producing in high volumes, using abrasive or glass-filled materials, or need a long-lasting, mirror-finish mould (over 10 lakh shots), choose H13.
Industry Applications in India
Both P20 and H13 are widely used across India’s plastics and automotive tooling industry. Here’s where each grade dominates:
| Industry | Recommended Grade | Reason |
| Automotive | H13 | High volume, tight tolerances, long mould life |
| Consumer Appliances | P20 | Medium run, cost-sensitive, faster delivery |
| Packaging (Caps & Closures) | H13 | Very high shot count, abrasion resistance |
| Electronics Housing | P20 / H13 | Depends on run volume and finish requirements |
| Medical Device Components | H13 (ESR Grade) | Mirror finish, cleanliness, long run |
| Soft Tooling | P20 | Quick machining, lower cost, short lead time |
Conclusion
Both P20 and H13 have their place in mould manufacturing—but the choice depends on your production goals:
· P20 = Cost-effective + faster production
· H13 = Long life + high performance
Sourcing P20 and H13 in India
Virat Special Steels stocks both P20 and H13 in ready inventory — supplied with full mill test certificates, hardness test reports, and chemical analysis. Available in round bars, flat bars, and pre-machined blocks across a wide size range.
| Need P20 or H13 for Your Next Mould? Get a fast quote — certified stock, ready to dispatch across India |
Contact our team to get more details about available sizes and technical specifications suitable for your applications.
https://www.viratsteels.com/products.html info@viratsteels.com
+91 98140-21775
Frequently Asked Questions
1. Which is better for long-run plastic moulds, P20 or H13?
H13 — higher hardness, wear resistance, and heat tolerance make it ideal for long runs.
2. What is the difference between P20 and H13?
P20: Pre-hardened, easier to machine, lower cost — best for short/medium runs. H13: Heat-treated, stronger, better for high-temp and high-volume applications.
3. Is H13 worth the higher cost?
Yes — for high-volume production, H13 delivers better ROI over time.
4. When should you choose P20 over H13?
When volume is low/medium, budget is tight, or faster machining/delivery is needed.
5. Which is better for high-temperature injection molding?
H13 — superior thermal fatigue resistance handles higher temps without deformation.
6. Can P20 be used for long-run moulds?
Yes, but it wears faster with abrasive materials and isn’t ideal for very long runs.
7. Which industries prefer H13?
Automotive, electronics, and high-volume packaging — anywhere durability matters.
8. What’s the cost difference?
P20: Lower upfront. H13: Higher initial cost, but better long-term value.
9. Best steel for 1 million cycle production?
H13 — built to withstand extended wear, heat, and stress over massive run counts.
Top 5 Tool Steel Grades for Die Makers-Complete Comparison
In the tool and die manufacturing industry, the successful production line often begins with one important decision that is choosing the right tool steel grade. When the correct steel is selected, dies last longer, machines run smoothly, and production targets are achieved with consistent quality.
Every manufacturing process has its own demands. A forging die must withstand intense heat and pressure, while stamping dies and cutting tools require exceptional wear resistance and hardness. Similarly, molds need the right balance of toughness and durability to perform reliably over thousands of production cycles.
Over time, die makers have learned that not all tool steels perform the same. Through years of experience and industrial use, certain grades have earned the trust of manufacturers because they consistently deliver strength, durability, and excellent performance on the shop floor. These trusted grades have become the preferred choice for die makers looking to achieve efficiency, reliability, and long die life.
1. DB6 Tool Steel – Advanced Steel for Longer Die Life
DB6 tool steel is gaining popularity among die manufacturers due to its exceptional toughness and wear resistance.
Key Properties
- Superior toughness
- Excellent wear resistance
- High fatigue resistance
- Longer die life
Common Applications
- Forging dies
- Heavy duty stamping dies
- High impact tooling
- Automotive die manufacturing
Why DB6 is Becoming Popular
Compared to conventional tool steels, DB6 offers longer tool life and better performance under heavy loads, which helps reduce downtime and tooling costs.
2. H13 Tool Steel – Best Hot Work Tool Steel
H13 tool steel is one of the most popular hot work tool steels used for applications involving high temperatures.
Key Properties
- Excellent heat resistance
- Good toughness
- High thermal fatigue resistance
- Good strength at elevated temperatures
Common Applications
- Forging dies
- Extrusion dies
- Die casting tools
- Hot stamping dies
Why H13 is Popular
H13 maintains its hardness even at high operating temperatures, making it ideal for hot forging and die casting industries.
3. D2 Tool Steel – High Wear Resistance Grade
D2 tool steel is one of the most widely used cold work tool steels in die manufacturing. It contains a high percentage of chromium, which provides excellent wear resistance and hardness.
Key Properties
- High wear resistance
- Good dimensional stability
- High compressive strength
- Moderate toughness
Common Applications
- Blanking dies
- Punches
- Shear blades
- Cold forming tools
- Stamping dies
Why Die Makers Prefer D2
D2 steel is ideal for applications where abrasion resistance is more important than impact resistance. It helps increase die life in high-production environments.
4. D3 Tool Steel – Maximum Hardness for Cutting Applications
D3 tool steel is another high carbon high chromium cold work steel known for its extremely high hardness and wear resistance.
Key Properties
- Very high hardness
- Excellent wear resistance
- High compressive strength
- Lower toughness compared to D2
Common Applications
- Cutting dies
- Thread rolling dies
- Knives and blades
- Cold extrusion tools
Why Die Makers Use D3
D3 is widely used where cutting performance and wear resistance are critical, especially in heavy duty cutting operations.
5. EN31 Steel – High Hardness Bearing Steel
EN31 steel is a high carbon alloy steel commonly used in tools requiring high hardness and wear resistance.
Key Properties
- High hardness after heat treatment
- Good wear resistance
- Excellent surface finish
Common Applications
- Dies and punches
- Bearing components
- Gauges
- Rollers
Why Die Makers Use EN31
EN31 is often selected for applications requiring fine finish and precision tooling.
Grade Comparison Table
| DB6 Hot work Cr-Mo-V | H13 Hot work Cr-Mo-V | D2 Cold work Hi-Cr | D3 Cold work Hi-Cr | EN31 Bearing Hi-C Cr |
| Standard: DIN 1.2714 | Standard: AISI H13 | Standard: AISI D2 | Standard: AISI D3 | Standard: BS EN31 |
| C content: 0.35% | C content: 0.38% | C content: 1.55% | C content: 2.25% | C content: 1.00% |
| Hardness: 54–58 HRC | Hardness: 48–54 HRC | Hardness: 58–62 HRC | Hardness: 60–64 HRC | Hardness: 58–62 HRC |
| Toughness & durability | Heat resistance | High wear resistance | Maximum hardness | High hardness |
How to Choose the Right Tool Steel Grade
Selecting the right tool steel depends on several factors:
1. Application Type
Cold work operations require D2 or D3, while hot work processes prefer H13.
2. Wear Resistance Requirement
For high wear conditions, D2 or D3 are excellent choices.
3. Impact Resistance
Applications with heavy loads benefit from DB6 tool steel.
4. Temperature Conditions
Hot forming applications require steels like H13 that can withstand high
temperatures.
Why Die Makers Trust Virat Steels
At Virat Special Steels, we supply premium quality tool and die steels for industries such as:
- Automotive manufacturing
- Forging industry
- Die making
- Precision engineering
Our wide range of tool steels ensures that die makers get the right material for maximum performance and durability.
Frequently Asked Questions (FAQs)
1. What is tool steel used for in die making?
Tool steel is used to manufacture dies, punches, moulds, and cutting tools because of its high hardness, wear resistance, and toughness.
2. Which tool steel grade is best for die making?
D2, D3, H13, EN31, and DB6. The best grade depends on the application, such as cold work, hot work, or high-wear operations.
3. What is the difference between D2 and D3 tool steel?
Both D2 and D3 are cold work tool steels with high wear resistance.
- D2 steel offers better toughness and dimensional stability.
- D3 steel provides higher hardness but lower toughness.
4. Why is H13 tool steel used for forging dies?
H13 tool steel is widely used in forging dies because it has excellent heat resistance, toughness, and thermal fatigue strength, allowing it to perform well at high temperatures.
5. Which tool steel provides the longest die life?
Tool steels with a balance of toughness and wear resistance, such as DB6 and H13, are known to provide longer die life in demanding industrial applications.
6. What industries use tool and die steel?
Tool and die steels are widely used in industries such as:
- Automotive manufacturing
- Forging and casting
- Metal stamping
- Plastic moulding
- Engineering and heavy machinery
7. How does the right tool steel improve production efficiency?
Using the right tool steel grade improves die life, reduces maintenance, minimizes downtime, and ensures consistent product quality, which ultimately increases manufacturing productivity.
Conclusion
By understanding the properties and applications of each grade, manufacturers can select the best tool steel for their specificrequirements for increasing production capacity.
Virat Special Steels has built a reputation as one of India’s most trusted suppliers, known for expertise, premium quality, and unmatched stock capabilities of various grades of Tool & Die steels.
📞 Curious about the right size, grades or technical specifications for your application? Our team is ready to guide you.
👉 Explore more: www.viratsteels.com | 📧 info@viratsteels.com | 📱 +91 98140-21775
Exploring the Prime Tool and Die Steel Supplier in India!
Tool and die steels are a group of high-carbon steels used primarily in the manufacturing of tools and dies used in metal forming and metal cutting processes. These steels are designed to have high hardness, wear resistance, and toughness, making them suitable for withstanding the severe conditions encountered during the shaping and cutting of metals.
Key characteristics of tool and die steels include:
- Hardness: Tool and die steels are heat-treated to achieve high hardness, enabling them to resist wear and abrasion.
- Toughness: Despite their hardness, these steels also exhibit toughness, which is crucial for withstanding the impact and shock loads associated with metalworking processes.
- Wear Resistance: Tool and die steels should have excellent wear resistance to maintain their cutting and shaping abilities over an extended period.
- Heat Resistance: Some applications may involve elevated temperatures, so heat resistance is another important property for tool and die steels.
In terms of the future of tool and die steel industry in India, it is dependent on various factors, including the growth of the manufacturing sector, advancements in technology, and the overall economic development of the country.
Here are some potential trends and considerations, as India continues to develop its manufacturing sector, there will likely be an increased demand for tool and die steels to support the production of various goods. Innovations in manufacturing processes and technologies may lead to the development of new and more specialized tool and die steels with enhanced properties, contributing to increased efficiency and precision in metalworking.
The competitiveness of the Indian tool and die steel industry will be influenced by global market trends and competition. Adapting to international standards and quality benchmarks will be essential. Government policies and initiatives that promote the growth of the manufacturing sector, technological innovation, and skill development can positively impact the tool and die steel industry.
One of the best Tool & Die Steel Supplier in India is:
Virat Special Steels Pvt. Limited : This is a company that deals in all kinds of tool steel, die steel, plastic mold steel, high speed steel, and alloy steel. They provide value added services, such as material machining, cut pieces, and tailor-made material. They also offer metallurgical advice and quality assurance. They have a state-of-the-art plant in Gurugram and Ludhiana. They also have a strong distribution network across India.
Virat Special Steels Provides Special Steels in All Major Cities India.
Agra, Alwar,Ambala, Anand, Bhiwadi, Dehradun, Ghaziabad, Haridwar, Rudrapur, Delhi, Faridabad, Kanpur, Noida, Gurgaon, Manesar, Kundali , Chandigarh, Waluj , Vadodara, Pimpri – Chinchwad, Rajkot, Jaipur, Ahmedabad, Pithampur, Surat, Amravati, Vadodara, Indore, Bhopal, Ranchi, Jamshedpur, Howrah, Kolkata, Pune, Thane, Nashik, Mumbai, Navi Mumbai, Nagpur, Ambattur, Bangalore, Belgaum, Chittoor, Dindigul, Hyderabad, Ernakulam, Chennai, Secunderabad, Visakhapatnam, Coimbatore, Mysore, Nellore, Kochi, Thiruvananthapuram, Trivandrum, Vijayawada, Guntur, Tirupati, Nazarathpet, Kakinada, Kurnool and many more..
You can visit their website: https://www.viratsteels.com/