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High-Performance Blades Sharing ideas for getting the most out of our steel.

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  #1  
Old 03-14-2009, 05:17 PM
santino santino is offline
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cutting out blade blanks ?

is it ok to cut across a piece of flat stock such as a2 tool steel to get blanks instead of cutting them out length wise i think its ok just never done it before wnted to check with everyone thanks
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Old 03-14-2009, 06:37 PM
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DaveRuhlig DaveRuhlig is offline
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I don't know why there would be any difference, but I'd post this question over on the HT & Metallurgy page - one of those guys will definately chime in.
-Dave


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Old 03-15-2009, 11:28 AM
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Gary Mulkey Gary Mulkey is offline
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Remember that all steel acquires a grain direction when it is rolled at the mill. If you are forging the blade blank this doesn't matter as you will be disrupting the original grain direction. If you are doing stock removal and not changing the grain of the steel, then the knife will be stronger if the grain runs lengthwise in the blade.

Gary
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Old 03-31-2009, 08:17 AM
Jim Dannels Jim Dannels is offline
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Newbie Questions! I was looking at the Admiral Steel price list for blade steels last night and it says on some steels it is cut from sheets.

How do you know if they cut it in the direction the sheet was rolled, or may have been cut across the sheet??

I'm guessing it would be less critical if your forging blades, than it would be for stock removal??
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Old 03-31-2009, 08:56 AM
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Jim,

If your using cpm steels I believe this is an exception to what Gary was talking about. Since cpm steels aren't liquid that is cast into ingots and rolled out. When I talked to Crucible (they're only about 30 minutes from my house) about aligning blades with the grain they said there is no grain in their steels.

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Old 03-31-2009, 08:26 PM
AcridSaint AcridSaint is offline
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Unless you get a hot rolled bar, almost all bar steel is sheared from plate. We really have no idea which way it was sheared. I've never had or heard of a knife failing from cutting width wise. The direction of the "grain" from the rolling mill isn't embedded though the whole plate, proper heat treating will solve any distribution or real grain problems. If you look at laser, waterjet or edm parts, you don't see anyone asking which direction they were cut.


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  #7  
Old 03-31-2009, 09:07 PM
santino santino is offline
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that is what david at great lakes waterjet told me too thanks guys
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Old 04-01-2009, 03:09 PM
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If you find data on impact strength you will normally find a significant difference in that transverse impact strength is lower than longitudinal impact strength. The CPM steels don't have that difference.
However I don't remember any study by knife makers to find the diffence in practical terms. It might show up in batonning if you hit the blade off square.There a blade cut tranverse to the rolling direction would be better.
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  #9  
Old 04-10-2009, 08:23 AM
santino santino is offline
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blades got cutout lengthwise so no worries
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