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  #1  
Old 01-02-2014, 03:06 PM
Whipster Whipster is offline
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Seeking advice on edge thickness, pre-HT, S30V

Hi all... I'm looking for some advice. I had some trouble grinding the knife in the pics, and I ended up getting way thinner at the edge than I wanted... The blade is flat ground at a 4 degree included angle. It is down to something like 5 mils right at the edge, and is 0.020" at about 0.15" back from the edge.

I'm wondering if I should just re-profile the blade a bit, pre-heat treatment, to get the edge back to where it is 15-20 mils thick... or should I just send it off for heat treatment (Paul Bos probably) and see what happens?

The steel is S30V, started out as 1/8" stock.

Thanks in advance for your input!

- Dwight
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Last edited by Whipster; 01-02-2014 at 09:06 PM.
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Old 01-02-2014, 03:24 PM
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Ray Rogers Ray Rogers is offline
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Well, we generally say leave the edge about as thick as a dime to be certain it won't warp but what you have is what you have. I'd leave it as it is. It might warp the edge, but if it does you can re-profile it at that time. If it doesn't warp, everything's good. Grinding it back to 20 thou now won't guarantee that it won't warp so i figure the more metal you have now the better your chances of fixing it after HT....


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Old 01-02-2014, 03:33 PM
Whipster Whipster is offline
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Hi Ray - thanks for your answer! It seems to me that a dime is about 0.050" thick, which seems right for an edge on an oil-quenched steel... but I read somewhere that for air-hardening steels like 154CM or S30V, that 20 mils is fine...

But I like your suggestion to get it treated and see what happens. Thanks for confirming that, because I was already leaning that way...
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Old 01-02-2014, 04:20 PM
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Ray Rogers Ray Rogers is offline
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I'm not sure how Paul Bos or any other particular heat treater will process your blade but I can tell you that S30V can be processed as an air hardening steel or as oil quenched (and two different methods for oil). The results are better with oil but most commercial outfits will choose the cheaper, easier method and do it by air or plates. I don't think that changes anything about your situation but you might like to know.

I've been making my Rayzor series of knives for at least 10 years, some models a little similar to your knife, and nearly all of them from S30V. I use an interrupted quench in high speed oil, followed by a 2 atm (minimum) air quench, followed by cryo, followed by 3 tempers of 2 hrs each. If you do all that you'll get about all the performance S30V has to give ...


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Old 01-21-2014, 05:28 PM
Whipster Whipster is offline
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They're back!

Well, I got the "too thin" knife back from Paul Bos Heat Treat today, and it looks perfect... straight as an arrow, no scale to speak of... I love it! The guys at Paul Bos did perfect work on this.
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154cm, advice, angle, back, bee, blade, choose, edge, flat, grind, grinding, heat, heat treat, heat treatment, knife, knives, metal, profile, quenched, s30v, steel, thickness, warping


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