Keywords: quenching medium, CaCl2, MgCI2, ZnCl2, cooling, water, oil, cracking, workpiece, carbon steel,

　　Trichloride solution quenching medium is a solution prepared from CaCl2, MgCI2 and ZnCl2 salts. Its cooling performance is between water and oil, its boiling point can reach 300 ℃, and its cooling rate is only 1/10~1/8 of water in the range of 300~200 ℃. It can effectively control the quenching distortion and cracking of the workpiece and is an ideal quenching medium for carbon steel and low alloy structural steel.

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