Is this steel already heat treated?

centennial

centennial

Joined
Oct 7, 2013
Messages
162
I got this piece of S30V a while ago. It was included with some knife making machinery I bought from a guy.
I no longer have any contact info for him, so I can't ask him.
Does the number in the second photo indicate that this piece of steel has been heat treated?



 
No.

Think about it.... who HT's entire bars before grinding off the mill scale, cutting to profile and drilling their holes? That would be either stupid or insane or a little of both. Besides, if the bar had been HT'ed the sticker and paint would be burnt off. We're talking about temps in the neighborhood of 2000 degrees.
 
No

HRA is correct as Hot rolled Annealed




They use "Heat Number"

instead of "Batch number" as traceability back to specification paperwork
 
james terrio said:
Besides, if the bar had been HT'ed the sticker and paint would be burnt off. We're talking about temps in the neighborhood of 2000 degrees.
Click to expand...

Unless they were those crazy type of people who would do something so wild as to put the sticker on AFTER HT. :eek:

Just messin. :D
 
The symbol "HT# P72306...." most probably refer to what is called in steel manufacturing "The Heat Number". Heat number refers to the batch that the piece came from. Each "heat" of steel is slightly different in chemical composition, yield strength, etc. These numbers are recorded and often times they accompany the actual steel and are delivered to the end user. In nuclear construction it used to be required to have the associated documentation on file for all steel - piping, structural, pressure boundary steel, etc. I have had to go back and get the heat data for structural steel on more than one occasion to see if I could squeeze a precious few more psi out of ultimate yield strength to get something to squeek by. I don't know very much about the protocols of knife steels, tool steels but I would bet you that you could call the vendor with that heat number and get all the technical and chemical data that is associated with that stick of steel. You are not the first person to be fooled by that symbol.
 
redd1981 said:
Unless they were those crazy type of people who would do something so wild as to put the sticker on AFTER HT. :eek:
Click to expand...

Yup, Crucible does that all the time :rolleyes:

As for the paint, the other fellows are correct about it being the "heat" number, like a "batch" or "lot" number.
 
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