What is the difference between titanium-coated and steel burrs in a coffee grinder?

Titanium coating on coffee grinder burrs is presented by some manufacturers as a durability or cutting precision advantage. The reality is more nuanced: titanium brings measurable benefits in specific contexts, but does not necessarily justify extra spending in every use case.

Coffee grinder burrs — whether flat or conical — are almost universally made from hardened stainless steel or tool steel. The hardness of this steel, typically 55–65 on the Rockwell C scale, determines its wear resistance and ability to maintain a precise cutting edge over time.

Titanium coating (titanium nitride, TiN, or pure titanium depending on the formulation) is applied to burr surfaces through a Physical Vapour Deposition (PVD) process. This coating provides three theoretical advantages. First, surface hardness: titanium nitride (TiN) has a surface hardness greater than most hardened steels (approximately 80–85 equivalent HRC), which reduces wear on the cutting surface. Second, corrosion resistance: titanium is naturally more resistant to oxidation than steel, which can extend service life in humid environments. Third, friction reduction: a smoother surface can slightly reduce the friction coefficient, theoretically affecting heat generated during grinding.

However, several important nuances apply. Grinding heat is more closely related to rotation speed and coffee flow rate than to burr material — well-designed steel burrs can generate less heat than a poorly designed titanium burr set. The sensory impact of the coating is difficult to isolate in blind tests — other parameters (geometry, speed, particle size distribution) dominate the result in the cup. As for lifespan: a quality grinder with conventional steel burrs can grind several hundred to several thousand kilograms of coffee before reaching significant wear — titanium may extend this, but rarely decisively for home use.

In practice, burr geometry (the cutting profile, tooth angle, number of cutting zones) has a far more direct impact on grind quality — particle size distribution, fines ratio, consistency — than the surface material. A grinder with high-quality flat stainless steel burrs will often outperform in grind quality a grinder with poorly profiled conical titanium burrs.