What is a peened finish and what advantages/disadvantages does it have?

TheChunk91

TheChunk91

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Aug 15, 2013
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So im looking on jantz knife supply thinking about buying a fixed blade to build and on some of their finish options they have a peened finish, I have no idea what this is so could somebody please explain it to me? Im really liking the pattern #31 in D2 so would this kind of finish help or hurt the corrosion resistance?
 
Maybe they mean a faux-hammered finish? Shot-peening would be the only peening finish that I can think of from an industrial process standpoint and that wouldn't make a lot of sense for a knife blade.
 
It's my understanding one reason that shot peening steel and other metals relieves some of the stress due to heat created by welding and other fabricating processes.
 
I've heard of a couple makers shot-peening their blades. It looks cool. I don't really see much advantage to it otherwise... but I've been wrong before.
 
On the website all it says is peened finish, with no description otherwise. If its shot peening does that mean it would have no advantage for a knife whatsoever?
 
Ok, in that case I will probably go with the satin finish. I might stonewash it anyways, I have always wanted to try that so this might be a perfect opportunity.
 
jaymack9100 said:
It's my understanding one reason that shot peening steel and other metals relieves some of the stress due to heat created by welding and other fabricating processes.
Click to expand...

It's a form of case-tensioning. Basically it increases rigidity by putting the outer skin of the steel into a tensive state. It has to be done uniformly, though, or else any irregularity can actually cause a stress point, almost like piercing a balloon (to use hyperbole.)
 
FortyTwoBlades said:
It's a form of case-tensioning. Basically it increases rigidity by putting the outer skin of the steel into a tensive state. It has to be done uniformly, though, or else any irregularity can actually cause a stress point, almost like piercing a balloon (to use hyperbole.)
Click to expand...

^^This.

Engine parts that are subject to a lot of stress (like connecting rods), are often shot-peened.
 
What the other fellows said... shot-peening definitely serves a purpose. I'm just not sure how much difference it would make in a knife blade.

It's kind of pricy to really do it right. Whether a $30 blade from Jantz has a true industrial-quality shot-peened finish is... unknown to me.

pic from Jantz website:

J2207-2T.jpg
 
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