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08-24-2012, 06:06 PM #21
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Thanked: 995This is true and most PW makers avoid this recipe because it has been pretty well debunked as producing hard and soft layers together. The principle that defeats this myth is that at welding temperatures all the carbon from both materials will average out. You wind up with a medium carbon steel that may or may not work well, but it will have a pattern.
Using similar tool steels is a very good thing to do. To get the steels to look different, commonly, the smith will use an alloy that contains 2% or so of nickel which resists the etchant and produces the whiter layers. But, there are many combinations with other alloying elements that will produce contrasts. There are ways to produce a white layer in the same steel, simply folding it back onto itself, that will produce layers and contrasts, but that requires some really effective technique or gross inattention.
Given the correct edge geometry, mild steel will cut stuff. It won't cut very long compared to a hardened higher carbon steel, but it will cut things.
I know several very good folks who could accomplish welding two steels of significantly different characteristics. I was told it wasn't a good ideal to weld L6 to 52100. That was a very miserable but successful project that I will not likely do again. The knives are really quite nice though.
Maybe it's best to say that nothing is impossible. These same folks could (have done) blades where the layers are of different hardnesses. But, that was a deliberate experiment that required precise temperature controls that are not very common in the smithing world.
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08-24-2012, 06:35 PM #22
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I am sure this razor was hardened during the making of this razor and stiff enough steel was used..
08-26-2012, 07:46 AM
#23
Yes, but all sorts of things, in a knife, will shave arm hair in a brief trial, which are no good at all for a razor. That is why razors are commonly tempered to such a hardness that they will break across or lose a large half-moon when dropped, and almost no use appropriate to a knife is permissible. That is mostly heat-treatment, but the same applies to the composition of the steel, and an angle of bevel quite inappropriate to a razor won't prevent a knife passing the arm-hair "test".
Almost all modern damascus blades use different steels in layers which could mean a hair encountering more than a hair's breadth of one alone in the cutting edge. If different hardness survives the welding, anything that isn't good enough for a razor on its own isn't good enough to be part of a damascus razor. In a knife for some applications, such as cutting meat, a microscopic saw-toothed effect may be very useful. but a razor is different.
For similar reasons, I don't believe acid etching is appropriate in a damascus razor. In the sort of microphotography which you sometimes see on this board, I believe it would look like teeth interpersed with areas of honeycomb.
Last edited by Caledonian; 08-26-2012 at 07:54 AM.
08-27-2012, 06:08 PM
#24
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I entirely agree that the steels used in PW material should each be able to stand alone as a functional material. But you argue in manner suggestive that this is somehow a common occurrence amongst the majority of PW makers, or that PW steels by themselves are all suspect for this problem. On this point, I disagree. This thread began and ends with the concern that quality controls with Pakistani PW steels have generated reputational problems.
The hardening process is an entirely separate operation that occurs after the assembly of the billet. Briefly, the carbon content homogenizes (usually by the third or fourth welding pass) across all the different materials in the billet, except pure nickel - which will not harden regardless. Nothing about welding the steel affects the hardenability of those materials. There are other significant processes involved preparing the material welded for heat treatment later. By that point, with a microhardness tester, it should be shown that all layers have the same hardness, driven by the carbon content and not the minor alloying elements that produce the contrast in layers.
Microserrations are more likely from the grinding abrasives than a feature of the PW steel itself, especially if the myth of hard and soft layers dies the death it so richly deserves.
Any microserrations would also likely disappear in the honing and polishing of the edge before shaving with such a blade. Any pattern, etched, would also disappear during the establishment of the bevel and subsequent honing/polishing and preparation of the edge to shave.
A fair test would be to try several of the suspect steel mixtures, several well established "good" tool steel recipes, hone them up and see what happens, via photomicrographs, after a suitable interval of testing across several face types. I don't have access to a microhardness tester (capable of testing the hardness of individual carbide crystals) but would be very interested in adding this as a variable if it were possible.
08-28-2012, 12:23 AM
#25
08-28-2012, 01:17 PM
#26
I have to agree with most comments here. Anything razor related from Pakistan is likely to be junk. Avoid at all costs. There are plenty of those on ebay and they might look cheap, but will shave your face about as much as a cheese grater. Ouch! And I speak from experience...
08-31-2012, 12:15 PM
#27
Mike is right on with his statements above. The carbon does average out. So, using two high carbon steels is a good idea.
The biggest problem with using pattern welded steel for razors, is the weld seams. Any "porrosity" or micro-crud in the weld makes that area more likely to micro-chip on the edge. It is usually best if the weld seams run fairly parallel to the edge, at the edge. Quality control during welding, forging, and heat treating are always the biggest factors.
All of the edge photos on my page are of O1/L6 pattern welded steel: Zowada Custom Knives - Razor Edges
I hope this helps.
08-31-2012, 01:47 PM
#28
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I have examined a bunch of these and tried to hone some as well. So far, they have all been a waste of time other than acknowledging the outcome.
The steel on these razors does seem lighter to me than the Pattern Welds from here. Is this just my imagination or is something else going on here??
Thanks
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DFriedl (09-18-2012)
08-31-2012, 01:49 PM
#29
Don't take this the wrong way, but would you mind telling us what your experience is regarding razors?
how long have you been shaving with them, and have you honed your own razors and compared them with razors honed by other people?
the reason I ask is that you have 1 post and none of us knows you.
Shaving arm hairs literally means nothing and the term 'razor sharp' is equally meaningless if the person using it has no experience in shaving and honing straight razors.
Til shade is gone, til water is gone, Into the shadow with teeth bared, screaming defiance with the last breath.
To spit in Sightblinder’s eye on the Last Day
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jaswarb (08-31-2012)
08-31-2012, 03:51 PM
#30
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Ahhhhh and there lies the irony of all these posts Bruno...
A 1 post wonder Necro-posts a thread with a Knife comment and everyone starts arguing about PW steel, which has ZERO NADA Nothing to do with these Pakistani razors.. A simple check of that Poster's history shows one visit one time never to return since...
Hmmmmmm Me Thinks we was duped
Last edited by gssixgun; 08-31-2012 at 04:35 PM.