machinable, heat treated 4140 - the home machinist!
Dec 25, 2009 · Never saw 4140 used as a cutting edge tool. 4140 is tougher and more stable than common low carbon cold rolled or hot rolled steel. I think making quick change tool holders would be a good application for 4140 pre-hard. Some like 4140 for making gun parts. 4140 pre-hard is not difficult to machine, similar to A-2