Treatment of temper and normalizing of alloy steel castings

- Sep 10, 2018-

Alloy steel castings in the process of tempering and normalizing treatment, can effectively reduce its brittleness, eliminate or reduce internal stress, alloy steel castings can obtain the required mechanical properties of workpiece, the workpiece after the quenching hardness and brittleness is big, in order to meet the requirements of different performance of various artifacts, can be tempered with appropriate to adjust the hardness, decrease the brittleness, get needed toughness and plasticity.

For some alloy steel castings which are hard to soften after annealing, high temperature tempering is often used after quenching, which can make the carbide in the steel gather properly, thus reducing the hardness. In this way, it is more convenient for cutting and the production of precision castings still needs to be normalized.

Casting alloy steel castings are fire is be heated to above the critical temperature of 30-50 ℃, the heat preservation time after appropriate, in the stillness of the air cooling heat treatment known as normalizing.The main purpose of normalizing is to refine the microstructure, improve the properties of steel, and get microstructure close to equilibrium.