Analysis of CK67 and CK75 spring steel
Spring steel mainly has good elasticity, and because it works under dynamic load environment conditions, the material that manufactures the spring should have a high yield strength; it does not cause plastic deformation when subjected to heavy loads; High fatigue strength, long service life under repeated load; and sufficient toughness and plasticity to prevent sudden brittle fracture under impact.
The spring is used under impact, vibration or long-term stress. Therefore, the spring steel has high tensile strength, elastic limit and high fatigue strength. The process requires that the spring steel has certain hardenability, is not easy to decarburize, and has good surface quality. Etc., carbon spring steel, that is, high-quality carbon structural steel alloy spring steel with carbon content WC in the range of 0.6%-0.9% is mainly silicon-manganese steel, their carbon content is slightly lower, mainly by increasing silicon content Wsi Improve performance; there are also alloy spring steels of tantalum, tungsten and vanadium. Alloy spring steel has a carbon content of 0.45-0.75%. The alloying elements are Mn, Si, W, V, Mo, etc. Their role is to improve hardenability and stability, strengthen ferrite and fine The particles can effectively improve the mechanical properties of the spring steel, and Cr, W and Mo can also increase the high temperature strength of the steel.
Spring steel has higher hardness and wear resistance after quenching and tempering, but has low heat hardness, poor hardenability, easy deformation, low plasticity and strength. Used as a tool that requires high hardness and wear resistance, such as simple molds and punches, metal cutting tools, drilling tools, woodworking milling cutters, countersinks, axes, chisels, longitudinal hand saws And secondary tools such as fitter assembly tools and rivet dies.
