Choose 20# material filter cover, processing technology has heat treatment, Heat treatment is essential in the forging process of this product, one of which is quenching. During quenching, the most commonly used cooling medium is salt water, water and oil.

Saline quenched workpiece, easy to get high hardness and smooth surface, not easy to produce hardened soft point, but easy to make the workpiece deformation serious, even cracking.

Oil as quenching medium is only suitable for the quenching of some alloy steel or small size carbon steel workpiece with relatively large stability of undercooled austenite.