12L14 is a lead-sulfur composite free-cutting structural steel. In lead-free cutting steel, lead is distributed in the steel as tiny simple metal particles and does not solidify in the steel. During the cutting process, strong friction occurs between the tool and the workpiece, causing the lead particles in the steel to be molten. Precipitates, thereby playing a lubricating role to improve the cutting performance of the steel, crushing the steel chips, reducing tool wear, and ultimately extending tool life.
Compared with lead-free steel, the cutting performance of lead-containing steel can be improved by 20~50%, while the mechanical properties and heat treatment properties remain basically unchanged, and there is no impact on cold and hot workability and weldability. Lead free-cutting steel has been widely used as an important component in the manufacture of precision instrument parts, automobile parts, and various types of machinery. The disadvantage of lead free-cutting steel is that it has low contact fatigue and is not suitable for parts such as gears and bearings that bear heavy fatigue stress loads.
Scope of application: Mainly used for making occasions with small stress and strict requirements on size and smoothness: such as instruments, watch parts, automobiles, machine tools and other standard parts used in various machines, such as gears, shafts, bolts, valves , bushings, pins, pipe joints, spring seat cushions and machine tool screws, plastic molding molds, surgical and dental procedures, etc.
