Purpose of Annealing Steel Pipe

Steel tube annealing is heated to a certain temperature and thermal insulation for some time, and then it slowly cooling called annealing. The annealing of the carbon steel pipe is the tube is heated to the phase transition temperature of the phase transition or in part, after heat treatment method of slow cooling after incubation. Annealing into fully annealed, fully annealed and stress relief annealing. The mechanical properties of the annealed material tensile test to detect, can also be used hardness test to detect. Many steel supply, steel annealing state Hardness testing using Rockwell hardness tester, test HRB hardness, thin plate, strip, and structural steel pipe, surface Rockwell hardness tester can be used to detect HRT hardness . The purpose of annealing is to improve the organization in order to eliminate the organizational defects, the composition of homogenization and grain refinement to improve the mechanical properties of steel, to reduce the residual stress; can reduce hardness and improve ductility and toughness, and to improve the cutting performance. So annealing both in order to eliminate and improve organizational defects and internal stress left over from the previous process, to prepare for the follow-up process, so annealing is a semi-finished heat treatment, also known as pre-heat treatment.