Although zinc-chromium coating has many advantages, it also has some shortcomings, mainly reflected in: 1). The zinc-chromium coating contains chromium ions that are harmful to the environment and the human body, especia...
Oxidation is also called blackening or bluing. The workpiece is heated in a solution of air, water vapor or chemicals at room temperature or an appropriate temperature to form a blue or black oxide film on the surface of...
Surface treatment is a process of artificially forming a surface layer on the surface of the substrate material that is different from the mechanical, physical and chemical properties of the substrate. The purpose of sur...
The heat treatment of fasteners is a comprehensive process that puts the material in a certain medium for heating, heat preservation and cooling, and controls its performance by changing the surface or internal structure...
The coil element, also known as wire or coil material, is made by heating and rolling steel billets. (Hot-rolled wire rod cannot be used for the production of fasteners due to its size and surface quality, and must be re...
1. Bolts, studs, screws: Carbon steel is generally used for grades 3.6, 4.6, 4.8, 5.6, 5.8, and 6.8, and no heat treatment is required; Grades 8.8 and 9.8 are generally selected from low carbon alloy steel or medium carb...
