Keywords: control cooling, control, cooling, quenching medium, Ms point, quenching and tempering, quenching, heating temperature, stirring, quenching oil tank,

Application example of controlled cooling
　　The quenching medium used in the control cooling technology can use oil or water-soluble polymer. the key to the control technology is to determine the time to reach the Ms point.
　　Application Example. A gear blank with a diameter of 1100mm and a modulus of 8 shall be quenched and tempered. The material is 40CrMoA steel. The quenching heating temperature is 850 ℃, and the quenching oil tank equipped with a variable speed medium stirring system is used for controlled cooling, and then tempered at 560 ℃. After calculation, Ms = 308 ℃, the time to reach Ms point is 467s, the quenching intensity value F = 0.42,Ms is the previous stirrer speed of 400r/min. The test results are Rm986 ~ 1007MPa,Rp0.2 869 ~ 913MPas,A5 19.4~20.2,Z64.7%~ 66.0, & alpha;K137 ~ 141J/cm2,HBS291 ~ 294. The performance meets the technical requirements and avoids quenching cracking and severe quenching distortion.
　　At present, the control cooling technology has been widely used in foreign countries and has achieved obvious results. The technology has also been adopted in China. It can be said that the control cooling technology is the leading direction of the development of immersion quenching in the future.

More Examples of Controlled Cooling Applications: www.quenchtank.com/view-271.html