Thanks TVP for your response. Your link was helpful. I had received some made from 17-4Ph that was hardened. The colour or tint of the parts were purple/blue. I have some parts in stock from a previous order that did not have this tint which made me question which is correct and if both lots had...
I really do appreciate all the responses. The tool is breaking at the same point every time (at the base of the thread where the undercut is). The heat treatment is as follows. Preheat thoroughly at 1450 deg F. Then raise to 1725-1800 deg F. Quench in still air or dry blast at 125-175 deg F...
Thanks for responding. The tool is 3/4" square x 2" lg. It's turned down on one end to 9/16 thread 1/2" long. It has a .281 dia. blind hole in the turned down end 1/2" deep. No shock loading, just the tightening and loosening of the nut on the end. It needs to be 55-60 HRc.
I have a tool that is used to pre-set ferrules on tubing. It's made from A2 tool steel and hardened. The problem is that the A2 is brittle and after about 6 to 20 uses it breaks. I was looking into using a differnt material such as 4340 and have it through hardened but I'm not quite sure how to...
