Rising tungsten carbide prices are pushing manufacturers to reconsider tooling choices for difficult-to-machine materials. For years, carbide has been the standard option in many applications involving heat-resistant superalloys because it is versatile and can be used on most machine tools.
These alloys, including Inconel 718, are engineered to retain strength and stability under high heat and mechanical stress. They are commonly found in aerospace, medical, power generation, and oil and gas applications, where resistance to temperature, pressure, wear, and aggressive environments is often essential.
According to the material cited by Modern Machine Shop, Tungaloy-NTK America says carbide remains an effective and widely used choice. However, when carbide costs rise and cycle-time reduction becomes a higher priority, advanced cutting materials such as ceramics and cubic boron nitride can offer process advantages. In this framing, ceramics are particularly relevant for roughing HRSA materials.
The main distinction is thermal behavior. Unlike carbide, ceramic inserts are described as capable of running at very high cutting speeds while staying stable at elevated temperatures. Rather than trying to minimize heat, ceramic tools perform best when heat is concentrated in the chip instead of the cutting edge. The source says this allows ceramic inserts to run several times faster than carbide while maintaining consistent performance.
For finishing high-temperature alloys, the article points to CBN inserts where surface finish and dimensional accuracy matter most. CBN is described as one of the hardest cutting materials available, with strong wear resistance at elevated temperatures. In finishing Inconel 718, the source states that CBN can run at cutting speeds similar to ceramic tooling, but with lighter depths of cut, typically in the 0.1-0.5 mm range.
The article also references specific supplier offerings for these applications, including NTK Bidemics advanced ceramic composites, SiAlON ceramic grades SX7, SX3, SX9 and SX5, and Tungaloy’s BX815 CBN grade for finishing Inconel 718. Performance statements for these products are presented as supplier claims. Overall, the item suggests that as carbide costs increase, tool material strategy may play a larger role in balancing productivity, finish quality, and operating cost in superalloy machining.
