Aidan,
We had good with quenching in water. Current Rc. is 55Rc. To get 35 Rc. what draw temp. do you suggest. Our 2759 says 1200 for 4hours. Old school charts tell us 880 for 2 hours.
The part has close tolerances so we are heat treated material first. We need 38-40 Rc. We never had this much trouble with 4130. Oven is Delta dual chamber and is in AS 9100 Calibration. We think our problem is in quenching. We use Houghton-Quench K. Anyone had any problems with Houghton?
We are through hardening. We have tried a few different trials. 1600 for 2 hours. Oil quench and checking before drawing. We are getting 15 to 20 Rockwell.
