I have recently been working with steels that are supposed to perform better with a cryo treatment. S35VN, Nitro V, etc. Up until recently I have only been using CPM154, PSF27 and various carbon steels for my trade so I never really considered cryo. I am fortunate that I have a welding supply a mile from my house that sells liquid nitrogen so I’m in business so to speak.
In everything I’ve read, soak times vary from 30 minutes to overnight, with some even soaking 24 hours. There seems to be no rhyme or reason to it. My first batch of S35VN I soaked for 30 minutes immediately after heat treat but obviously before tempering. I wasn’t very happy with the results, as it didn’t really increase hardness at all per my hardness tester.
Most data sheets for a particular steel will only reference a “cryo treatment “, never mentioning a specific time.
Im interested in what your preferred soak times are. Thanks in advance.
In everything I’ve read, soak times vary from 30 minutes to overnight, with some even soaking 24 hours. There seems to be no rhyme or reason to it. My first batch of S35VN I soaked for 30 minutes immediately after heat treat but obviously before tempering. I wasn’t very happy with the results, as it didn’t really increase hardness at all per my hardness tester.
Most data sheets for a particular steel will only reference a “cryo treatment “, never mentioning a specific time.
Im interested in what your preferred soak times are. Thanks in advance.