dahvee1 Posted September 23, 2013 Share Posted September 23, 2013 The company I work for is considering using cooling tower water as quench rather than city water (current condition). The estimated annual savings is over $30,000. City water here is about 600 PPM salt, while the cooling tower will be controlled at 1200-1400 PPM. How will this increase in salt effect the cooling rate of the quench? Will these low concentrations of salt make a difference? Scale on the bars? Etc.? We are processing mainly 1045 steel bar. Typically we acheive around 60 Rc at the surface and 55 Rc @ 0.050" case depth, depending on the setup and requirement. Link to comment Share on other sites More sharing options...
doG Posted September 23, 2013 Share Posted September 23, 2013 More salt will cause it to quench faster.... Link to comment Share on other sites More sharing options...
Enthalpy Posted September 24, 2013 Share Posted September 24, 2013 No effect on quenching efficiency at all, with 1000ppm. Scale: I'd say little difference. Seawater makes a big difference, with 35,000ppm. Link to comment Share on other sites More sharing options...
Enthalpy Posted September 26, 2013 Share Posted September 26, 2013 Do you quench in water after induction heating? I thought the surface was quenched by the underlying material, which stays cold with induction heating. Link to comment Share on other sites More sharing options...
Delbert Posted October 5, 2013 Share Posted October 5, 2013 (edited) Do you quench in water after induction heating? I thought the surface was quenched by the underlying material, which stays cold with induction heating.Good point. Skin effect and all that. With a good conductor and internal current produces a energising field that will induce a cancelling current. Sort of eddy currents cancelling eddy currents. Edited October 5, 2013 by Delbert Link to comment Share on other sites More sharing options...
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