Mystery Steel?

Danbo

Danbo

Joined
Nov 28, 1999
Messages
14,985
I have obtained a bar(2'x2"x1/4") of steel labeled Sverker 21. I know nothing about this steel, other than I was told it is the Swedish version of D2. I need help identifying this steel, hopefully someone knows the analysis and heat treating specs. Thanks, in advance.



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Danbo, soul brother of Rambo
 
-- Description
Cold Work, high carbon, high chromium tool steel. Air hardening. Appears to be a European tradename for D2.

-- Composition (Approxiamte percentages -- varies by manufacturer)

Carbon : 1.0 - 1.5
Manganese : .40
Silicon : .50
Chromium : 11.5 - 12.5
Molybdenum: .70 - 1.3
Vanadium : .90-1.10

-- Basic Heat Treating
Preheat slowly to 1500 F and then increase temperature to 1850 F. Hold at 1850 F for 20 to 45 minutes and air cool (air quench). Temper at 400ºF for one hour, two times.
 
With that high of a chromimium content, it would have to be air-hardening. The instructions I have on tempering D2 show 900f, though. What RC does that get you, Primo?

------------------
Oz

Always remember what to do to them if they can't take a joke.

Check out my egostistical homepage!
http://www.freespeech.org/oz/
 
Hey Oz,
I get all this stuff from notes I've compiled through the last seven years or so. In most cases the info comes from several different sources. That's the case here as well. So here's the scoop based on my previous post:

Principal Metals suggests 400 F. for an approximate HRc of 61.

Wayne Goddard suggests 450 F. for an approximate HRc of 59.

David Boye suggests 400 F. for an approximate HRc of 60 - 61.

The charts I have stop at 700 F. for an approximate HRc of 57 - 58.

There's also an article in the Articles section of http://www.knifeart.com that covers heat treating various steels, one of which is D2. The suggestion there is 400 F. as well. The author is not listed, but I think it may be Joe Talmage.

As for me personally, I temper D2 at 450 F. on the rare occasions that I deal with air hardening steel. I posted 400 F. figuring the majority rules.

All this is for D2. I used the basic specs for D2 in my post above because another source showed that the *mystery* steel was one of many tradenames used for D2.

[This message has been edited by primos (edited 03-01-2000).]

[This message has been edited by primos (edited 03-01-2000).]
 
Hey Claus,
I assume you are emailing the PDF files to Danbo (the original poster of this thread). Would you mind emailing the info to me too? I'd like to add the info to my notes for future reference. Also, I'd like to add the specs for compositional analysis to my web site. I have a chart there with the specs for about 50 different knife steels so far.

Terry Primos
primos@shreve.net http://www.shreve.net/~primos

ADDENDUM:
I just visited Uddeholm as you suggested and downloaded some of the PDF files. Now I've got to download and install Adobe Acrobat Reader to read darn things. * Thanks for the info. *


[This message has been edited by primos (edited 03-01-2000).]

[This message has been edited by primos (edited 03-01-2000).]
 
Boy Uddeholm supplies tons of info on this stuff! By the way they do allude to the fact that it's D2.

htchart.gif


Oz, here's a tempering graph from Uddeholm. For the hardening phase, they show 3 different temps that can be used with various soak times. The one which is pretty much in accordance with what I mentioned above is at 1870 degrees F. The graph shows temps in both Fahrenheit and Centigrade/Celcius, as well as showing lines for each of the 3 hardening temps. It can get a bit confusing. If you look at the line where the steel was hardened at 1870 F., a 400 degree F. temper shows a Rockwell of about 60HRc. 450 F. looks like about 58-59 HRc. Interstingly enough, 900 F. is also in about the 58HRc range when the steel was hardened at 1870 F. assuming I'm reading this correctly. Interesting stuff huh?


[This message has been edited by primos (edited 03-01-2000).]

[This message has been edited by primos (edited 03-01-2000).]
 
Good to know, since the only D2 blade I've done so far I tempered at 400, since that's as high as I can hold a temp at reliably outside of the forge. I let it soak for a half hour or so at 1925, approximately. It turned out a lot better than I expected.
I didn't realize there were so many options for heat treating the air hardening steels like that, thanks.

------------------
Oz

Always remember what to do to them if they can't take a joke.

Check out my egostistical homepage! http://www.freespeech.org/oz/

[This message has been edited by Osbourn (edited 03-01-2000).]
 
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