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I think that at 1470f, an excess of carbon is starting to get into solution, and the low areas are retained austentite, or carbon going into the grain boundaries. Someone correct me if I'm wrong please (Kevin Cashen??) At 1460f, the Rc#'s were within 1/2 point of each other over 5 readings. At...

I repeated my 1470f austentize. I used the same normalizing program in the evenheat as the previous run, and without tempering, the numbers I got were: 64, 65, 66, 67, 62 low, 63, 66, 67, 68, 66, 66, 69 high, 66, 67, 66, 66, 68, 67. I was unable to duplicate the 70.5 high on the previous...

You were right about this site. Thank you for referring me here at the hammer in.

Great diagram! This is how I do it. I have to show my buddy this. He's struggling with his grinds.

As long as you leave yourself .006 min, or .010" to be on the safe side for decarb removal, you are fine. Under .020" at the edge prior to heat treat increases the risk of bacon edge. This is for oil and water quenching steels. Stainless with foil or shielded atmosphere can be pretty much...

I stop at about 0.050" with a 36g belt, then switch to a 60, clean it up, then a 120 and repeat. I am usually at about 0.030 or so at this point, ready for heat treat. Since I grind post heat treat, I stop there, but I do hand sand a bit to make sure there are no gouges I missed. If so I clean...

Practice, and measure with callipers.

I agree with 1084 or 1075. 15n20 is pretty forgiving too, but it does it's best with a precise short soak at about 1480f. The nickel ads a bit of toughness.

The 1200 isn't necessary. I probably should amend the cycle in the kiln. I was using it for 52100, but I don't think it's needed there either. I was following the cycles used by a well known maker who finishes the cycling with a 1200 soak.

Exactly!!! This is the difference.

It isn't my explanation, I'm just reporting what was told to me by someon who's information I respect. :)

It doesn't make any difference.

Send them out. Stainless needs precise temp control such as a kiln will provide. It also requires shielding from oxygen such as foil wrap to protect the steel. Temps are close to 2000f for most stainless steels. After cooling most also need sub zero or cryogenic, ie. dry ice and acetone mix, or...

I would vote walnut on the second one, probably turkish, but its so hard to tell from a picture. I would think one of the rosewood derivatives for the first. I always refer to this article when these questions come up...

This is a topic I am curious about as well. Making steel decisions that minimize carbon migration from the high carbon core is what I would like to learn about.

I did 10 min at 1650, cooled to magnetic, 10min at 1550, cooled to magnetic, 10min at 1450, cooled to magnetic, 1200 for 1/2 hour and cooled to room temp. I unfortunately cannot recheck the coupon, or my 52100 for that matter, as the cat had a lot of fun playing with the steel coupons which were...

It was just one test in the series of 5 on the test coupon. As noted, there was much more variance in this heat treat than the lower temps. It might have just been equipment error. I could try another coupon at that heat treat and see what happens

Samuraistewart, I am Willie71. This forum changed my user name to my actual name, and I don't know how to change it back lol!

Knife In The Hat. Iirc the term comes from the depression era where men would whittle during the day, and they would do an exchange each day by drawing a knife from the hat each day to change it up a bit. Please correct me if I have the details wrong.

I know I have variance of Rc1.0 when I get down to about Rc50/51. It's pretty accurate in the low to mid 60s, so tester variance is a definite possibility getting up around 70. I was wondering about carbides, but there was a post on this that suggested it was not likely.