How to Choose the Right Tool Steel for Your Application
Selecting the proper tool steel is critical for achieving optimal performance and longevity in your mold and die components. Different tool steel grades offer unique combinations of hardness, toughness, and wear resistance, making them suitable for specific manufacturing applications.
Tool Steel Grade Comparison
The following table compares commonly used tool steel grades and their key properties:
| Grade | Equivalents | Hardness (HRC) | Toughness | Wear Resistance | Heat Treatment |
|---|---|---|---|---|---|
| D2 | SKD11, 1.2379, Cr12Mo1V1 | 58–62 | Medium | High | Vacuum/Atmosphere |
| H13 | SKD61, 1.2344, 4Cr5MoSiV1 | 48–54 | High | Medium | Vacuum |
| SKH51 | M2, 1.3343, W6Mo5Cr4V2 | 62–66 | Medium | Very High | Vacuum |
| O1 | SKS3, 1.2510, 9CrWMn | 58–62 | High | Medium | Oil Quench |
| S7 | — | 56–58 | Very High | Medium | Air Quench |
| A2 | SKD12, 1.2363, Cr5Mo1V | 58–62 | Medium-High | Medium-High | Air Quench |
Application Recommendations
Cold Working Tool Steels (D2, O1, A2)
- D2/SKD11: Best for blanking dies, punching tools, and high-wear applications. Excellent abrasion resistance.
- O1/SKS3: General-purpose tool steel for simpler blanking, bending, and forming operations.
- A2/SKD12: Balanced performance between D2 and O1. Good for medium-production runs.
Hot Working Tool Steels (H13/SKD61)
- Ideal for die casting, hot forging, and extrusion dies
- Excellent thermal fatigue resistance
- Maintains hardness at elevated temperatures
High Speed Steels (SKH51/M2)
- For high-speed punching and forming operations
- Exceptional red hardness properties
- Suitable for complex, precision components
Key Selection Factors
When choosing tool steel, consider:
- Production volume — Higher volumes require harder, more wear-resistant grades
- Material being processed — Thicker/harder materials need tougher tool steels
- Operating temperature — Hot forming requires heat-resistant grades
- Surface finish requirements — Higher polishability grades for optical molds
- Cost constraints — Balance performance requirements with budget
Browse Our Related Articles
We also provide guides on selecting the right Tungsten Carbide Grade and Surface Coating Technologies for your tooling needs. For a complete material specification, explore our Carbide Punches & Pins and Steel Dies & Bushings product lines.
At GS Machining, we help you select the optimal tool steel based on your specific application requirements. Contact our engineering team for material consultation and free sample evaluation.