ASTM A53 GR.B hot dip galvanized seamless steel pipe

　　Annealing is the workpiece heated to the appropriate temperature, according to the size of the workpiece and workpiece with different holding time, and then slow cooling, the purpose is to achieve or close to the internal balance of metal state, get good performance and performance, or for further quenching Organizational readiness.

　　Normalizing is the workpiece heated to the appropriate temperature in the air cooling, normalizing effect similar to the annealing, but get a more detailed organization, often used to improve the cutting performance of materials, but also sometimes used for some less demanding parts As a final heat treatment.