Commonly used metal materials are ferrous and non-ferrous metals. Requirements for cold heading steel: requirements for mechanical properties
Chemical composition requirements
The requirements of the metallographic structure are generally considered to be coarse grains of 1 to 4 grades and fine grains of 5 to 8 grades. The cold work hardening sensitivity of the coarse grain material is larger than that of the fine grain, and the plasticity is worse than that of the fine grain. It is suitable for the cold grain size of 4, 5, and 6 grades.
The surface quality of the material requires a defect on the surface of the steel and decarburization of the surface. Dimensional accuracy requires surface lubrication requirements for the reforming process of cold heading materials
Heat treatment of materials - low temperature stress relief annealing, full annealing, spheroidizing annealing (for C > 0.25% medium carbon steel, in order to meet the requirements of cold deformation process, spheroidizing annealing is often required.), solution treatment (for 1Cr18Ni9Ti for cold heading) For austenitic stainless steels, solid solution treatment is required to soften the steel.)