Hot pressing elbow is a kind of elbow made by hot pressing process. Hot pressing elbow is heated by the tube forming professional equipment, and then cutting the heated to above the critical temperature, holding time quickly into quenching agent, the temperature suddenly reduced, elbow making methods is greater than the critical cooling rate of rapid cooling of A.

Quenching of hot pressing elbow

The elbow quenching is heated above the critical temperature, holding time, and then quickly into quenching agent, the temperature suddenly reduced to greater than the critical cooling rate of fast cooling, and heat treatment method for unbalanced organization with martensite mainly. Quenching can increase the strength and hardness of steel, but reduce its plasticity. Quenching commonly used quenching agents are: water, oil, lye and salt solution.

Normalizing of hot pressing elbow

Normalizing is a heat treatment process that heats the hot elbow to above critical temperature, transforms the hot bend all into homogeneous austenite, and then cools naturally in the air. Fire can eliminate network cementite eutectoid hot pressing elbow, elbow pressing for hypoeutectoid normalizing can refine crystal lattice, improve the comprehensive mechanical properties of the elbow, the demand is not high by normalizing instead of quenching process is more economical.