Hot pressed pipe is the pipe heated and processed by professional equipment, then cut and heated to above the critical temperature, and then put into the quenching agent soon after holding for a period of time, so that the temperature is suddenly reduced, and the pipe is made of rapid cooling greater than the critical cooling speed.
One of the treatment methods: quenching quenching is to heat the elbow above the critical temperature, hold heat for a period of time, and then quickly put into the quenching agent, so that the temperature is suddenly reduced, and the speed of rapid cooling is greater than the critical cooling rate, and the heat treatment method of martensitic imbalance structure is obtained. Quenching can increase the strength and hardness of steel, but reduce its plasticity. Quenching agents commonly used in quenching are: water, oil, alkali water and salt solutions.
Normalizing is a heat treatment method that heats the hot pressing elbow to above the critical temperature, so that the hot pressing elbow is all transformed into uniform austenite, and then cooled naturally in the air. Normalizing can eliminate the mesh cementite of the over-eutectoid hot pressing elbow, refine the lattice for the subeutectoid hot pressing elbow, improve the comprehensive mechanical properties, and replace the quenching process with normalizing is more economical.
Hannah
Post time: Jul-12-2024