Bead Blasted Knife Question

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Kniv35

Joined
Apr 3, 2013
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Hey everyone,

I'm new here and I just joined cuz I have a question.

I just recently bought a knife from famed Japanese Knife maker Tomoyuki Nemoto through an Australian distributor.

The knife is called "Kouren" and from what I can understand it is bead blasted D2 steel.

Knife:

http://216.38.63.83/image.php?image=/images/products/26152.jpg

When I received the knife it had some spot rusting and i took care of it with some lemon juice and baking soda.

While rinsing the knife i went after some small rust spots with a dish sponge and it seems to have scuffed/removed some of the finish near the blade.

I took the knife to a metal workshop to get it re-blasted but guy says he thinks theres more to the finish than just bead-blasting so he's wary about it.

First of all, is this knife just bead blasted as Im assuming?

Second, what options do i have to fix the scuffed/scraped finish.

Knife officially referred to as 2008TOA-7 "Kouren".

Can't figure it out cuz makers website is all in Japanese.

Thanks.
 
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Bead blasted finish seems to rust more than other finishes. If he can bead blast it evenly you should get a decent finish but it may change the look depending on the exact media he uses and how he does it. There is also the chance the maker marks may get lighter or be removed depending on how they were applied (stamped, etched, etc).

I have used metal polish like Flitz or mag and aluminum wheel polish. They aren't gritty at all but will remove surface rust pretty good. I just put some on my finger but you can put it on a rag and go over the whole blade. After a couple treatments the blade doesn't seem to get the little rust specs that bead blasted seem to be prone to.
 
Bead blasting shouldn't be able to be removed so easily, might be a coating on the blade. Bead blasted knives are notorious for rusting, even in stainless steels. D2 isn't technically stainless, so be sure to keep it clean and oiled.
 
So really my only choice to remove the scraping is to get the knife re-blasted?

Would that negatively affect the strength of the steel? As in, would it soften the metal or ruin the blade?

I know D2 is tough, heavy steel and only semi-stainless.

Also thanks for responses!!
 
Im making 11 knives out of cpm d2, and half are sandblasted now, and already forming surface rust. I live in Colorado, so not to much humidity. It does rust quick, but easily removed with another blasting before heat treat. Be careful sandblasting, it removes material.
 
Jastab said:
Im making 11 knives out of cpm d2, and half are sandblasted now, and already forming surface rust. I live in Colorado, so not to much humidity. It does rust quick, but easily removed with another blasting before heat treat. Be careful sandblasting, it removes material.
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Very interesting.

What do you mean by it removes material?
 
Kniv35 said:
Very interesting.

What do you mean by it removes material?
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Imagine a mountain side... /\/\/\/\ it will hit the top and bottom of the pits and lower them the same. So you cant get a flat plan. Best way to describe it in text. Sandblast a soft material like g-10 and you'll see how much it removes. But if its just a small spot, hiy it quick and should work. Hope this makes sense.
 
A pencil eraser works great for light rust & shouldn't mess up any decent finish. Blasted steel rusts way easier than other finishes. If I were you I would polish the entire blade instead. Go to a hardware store and pick up some red rouge or polishing paste. I like Flitz because its a reallllly fine grit. It takes a while if its the only thing used but gets a really even finish.

A blasted blade will scuff up with use a bunch too. I'd give it a light polishing.
 
archieblue said:
A pencil eraser works great for light rust & shouldn't mess up any decent finish. Blasted steel rusts way easier than other finishes. If I were you I would polish the entire blade instead. Go to a hardware store and pick up some red rouge or polishing paste. I like Flitz because its a reallllly fine grit. It takes a while if its the only thing used but gets a really even finish.

A blasted blade will scuff up with use a bunch too. I'd give it a light polishing.
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Also very interesting!

So, do you suggest applying this over the finish or removing the finish THEN polishing?

Metalworks guy said he'd have to strip the finish thats on the knife before re-blasting. I dont know that I'd be comfortable with that so Im looking for options to even out the finish so that the scratched/scuffed area isnt noticeable.

I did lightly wax the blade using some clear furniture/wood wax about a month ago. Would that affect polishing it?
 
Bead blasting will take off the coating that's on it right now. No need to remove finish and then bead blast. Do it all in one shot, I work in a metal fab shop, ive bead blasted powder coat, black oxide, zinc plating. It will take it off I promise you that.
 
Jastab said:
Bead blasting will take off the coating that's on it right now. No need to remove finish and then bead blast. Do it all in one shot, I work in a metal fab shop, ive bead blasted powder coat, black oxide, zinc plating. It will take it off I promise you that.
Click to expand...

Good to know!
 
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