Cyaniding, or "liquid carbonitriding," is a fast-acting case-hardening process. The steel component is submerged in a molten bath of sodium cyanide at temperatures around 800°C to 900°C. The steel absorbs both carbon and nitrogen from the bath. When quenched, the surface develops a very thin, glass-hard "case" (typically 0.1mm to 0.5mm thick). While less common for large tubes, it is used for small tubular components and fasteners that must withstand extreme abrasion. The nitrogen provides additional hardness and corrosion resistance, making it superior to standard carburizing for small, precision parts.