Tungsten Carbide Dies vs Steel Dies: Comparison Guide

Which one is better between tungsten carbide dies and steel dies?  These two are often used in rifle dies, stamping dies, drawing dies, as well as punching or extrusion dies.This depends on several factors, such as costs, ease of machining, wear resistance, durability, and tolerance to high temperatures and corrosion.

Understanding Dies and Molds

Normally, “dies” are referred to as stamping forms used for stamping or metal forming, achieved through processes such as pressing, punching, or extrusion. “Molds”, on the other hand, refer to plastic forming and others. Both tungsten carbide dies and steel dies are used for metal processing.

Material Comparison

Material Features

Die steel and tungsten carbide are common mold materials that have wide applications in the mold manufacturing field. So, which one is better between die steel and tungsten carbide material? Let’s compare them in terms of material features, mechanical properties, wear resistance, machinability, and cost.

Die Steel

Die steel is a type of steel that has superior mechanical properties and wear resistance.

• High Hardness and Strength: Die steel has high hardness, strength, and toughness that can meet the high-strength and wear-resistant requirements during the mold’s operation.
• Heat Treatment: It has good heat treatment properties to improve hardness and wear resistance.
• Excellent Machinability: Allows for easy cutting and molding.

Tungsten Carbide die

Tungsten carbide is a high hardness, high strength alloy material mainly composed of tungsten and other alloy elements.

• Extreme Hardness: It has extremely high hardness and wear resistance suitable for mold operations.
• High-Temperature Resistance: Maintains good hardness and strength under high-temperature conditions.
• Corrosion Resistance: Capable of resisting corrosive environments.

Mechanical Properties

In terms of mechanical properties, both die steel and tungsten carbide possess high hardness and strength, meeting high-strength demands during mold operations. However, tungsten carbide’s hardness and strength are higher, making it more suitable for applications requiring these characteristics.

Wear Resistance

Both die steel and tungsten carbide have outstanding wear-resistant properties. However, tungsten carbide’s wear resistance is superior compared to die steel, making it more appropriate for high wear resistance applications.

Machinability

Die Steel:

Good machinability makes cutting and forming relatively easy. It can be machined using conventional CNC milling machines, lathes, and wire EDM machines. Standard carbide end mills are sufficient, and machining parameters are easy to adjust.

Tungsten Carbide:

Relatively poor machinability, requiring specialized machining techniques and equipment. How significant is the difference? Here are several practical examples:

• Electrical Discharge Machining (EDM): For the same cavity, machining tungsten carbide takes approximately four times longer than machining die steel. Electrode wear is also greater, resulting in significantly higher copper electrode consumption.
• Grinding: Standard aluminum oxide grinding wheels cannot effectively grind tungsten carbide. Diamond or cubic boron nitride (CBN) grinding wheels must be used. A diamond grinding wheel costs five to ten times more than a standard grinding wheel and requires more frequent dressing.
• Wire EDM: The wire EDM cutting speed for tungsten carbide is approximately one-third to one-quarter that of die steel. The consumption of molybdenum wire or copper wire also increases accordingly.
• Turning and Milling: Only PCD (polycrystalline diamond) or CBN cutting tools can be used. Both the feed rate and depth of cut must be significantly reduced; otherwise, the cutting tools may chip or break.

Simply put, tungsten carbide molds require longer machining lead times, more expensive consumables, and highly experienced machine operators. When frequent design changes require repeated mold modifications, the cost and lead time involved in modifying tungsten carbide molds can become a major concern.

Cost Considerations

Both the material and machining costs of die steel are significantly lower than those of tungsten carbide. There is no dispute about this. However, since 2025, the price gap between the two materials has widened further.

Material Cost Comparison

• Conventional die steel, such as Cr12MoV and SKD11: typically tens of RMB per kilogram by weight
• Tungsten carbide blanks: several hundred to several thousand RMB per kilogram, with substantial price fluctuations over the past two years

Actual Impact of Tungsten Raw Material Price Increases in 2025–2026

In April 2025, China implemented stricter total production quota controls for tungsten concentrate mining and intensified enforcement against unlicensed small-scale mines, significantly reducing upstream raw material output. Beginning in the third quarter of 2025, the prices of tungsten powder and tungsten carbide powder began to rise. After export controls on tungsten-related items took effect on January 6, 2026, prices increased sharply again.

The price data is shown below:

Although the price has fallen by approximately 60% from its peak, the current price remains more than three times higher than before this price increase cycle. This means that the raw material cost of tungsten carbide molds has increased severalfold compared with two years ago, and a return to previous price levels is unlikely in the short term.

Practical Recommendations

• For high-volume production applications requiring extremely long mold life, such as more than one million strokes, the allocated cost per part of tungsten carbide molds can still be economical. The impact of higher prices can be offset by their exceptionally long service life.
• For small- and medium-volume production requiring mold life ranging from tens of thousands to several hundred thousand strokes, die steel—especially powder metallurgy high-speed steels such as ASP-23 and HAP40—offers a more significant cost-performance advantage under current market conditions.

Conclusion

In conclusion, both die steel and tungsten carbide have their advantages and appropriate applications. When choosing materials, consider the specific requirements of the mold application. If higher hardness, strength, and wear resistance are required, tungsten carbide may be the right choice. If cost is crucial, die steel could be a better option. Additionally, based on specific situations, other suitable mold materials can also be selected.