Visit weldfabworld.com Perlite is the hidden microstructure that gives steel its strength and toughness. When austenite cools slowly below 727°C, it transforms into alternating layers of ferrite and cementite called pearlite. Fine pearlite increases strength, while coarse pearlite improves ductility. Understanding this transformation is essential for welding engineers, fabrication professionals, and mechanical engineering students. This short explains pearlite formation in a simple and visual wa