Stellite 19 is a cobalt-chromium-tungsten hardfacing alloy notable for an unusual dual identity: it is a wear-resistant Stellite grade with high carbon content (about 1.9%), but it has also historically been used as a tool material in its own right, valued for its "red-hardness" - the ability to stay hard from roughly 932 to 1562°F (500-850°C), an impact resistance comparable to high-speed steel, but with much higher hot-hardness than HSS. That combination made it a traditional choice for burnishing rollers, nozzle discs, high-temperature bearing races, and cutting tools used on corrosive, gummy materials like plastics and rubber.

As a workpiece rather than a tool, Stellite 19 sits firmly in the wear-resistant hardfacing group alongside Stellite 1, 12, 100, and 151 - its high carbon content builds a carbide-rich microstructure that resists severe shock and abrasion, in contrast to the high-temperature structural cobalt alloys (S 816, Stellite 188) covered elsewhere in this library, which are chosen for retained strength rather than surface hardness. Available as both castings and powder-metallurgy components.

Stellite 19's defining property as a tool material - the ability to hold hardness at red heat far better than high-speed steel - is exactly what makes it difficult to machine as a workpiece. Its 1.9% carbon content, combined with 31% chromium and 10.5% tungsten, produces a carbide-rich microstructure comparable in abrasiveness to Stellite 1: heat generated at the cutting edge does not soften the material the way it would soften steel, so the tool stays under full abrasive and thermal load throughout the cut.

Shock and impact resistance that make Stellite 19 valuable in service (nozzle discs, bearing races, burnishing rollers) also mean it resists the kind of controlled fracture that eases chip formation in more brittle high-carbide alloys - expect a demanding combination of abrasive wear and mechanical loading on the cutting edge. As with the other high-carbide Stellite grades, castings and hardfaced deposits are typically finished by grinding rather than brought to final size by turning or milling.

Within the wear-resistant Stellite group, Stellite 19 machines similarly to Stellite 1 - notably more aggressive toward tool wear than Stellite 12 or 151, and well beyond what the high-temperature structural cobalt alloys (S 816, Stellite 188) in this library demand.