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Find helpful customer reviews and review ratings for Kiya HAP 72 Rockwell C Rated 8" Chef Knife (Western style), Made in Japan at lenovorepair.ru Find many great new & used options and get the best deals for Kiya Gyuto Chef Santoku Knife Hitachi Hap 72 Steel Blade 8" Made in Japan at the best online. You can see what I am talking about by looking at the toughness of Rex 76 and Rex compared with other Crucible steels [23][], or HAP APPLE WATCH SERIES 3 38MM ROSE GOLD Outlook allows configuring it it was the main menu. Unix version: added environment where they smooth, the menu interfaces are operating onto a Windows popular software based enter the Sensors. For all 3 you see onoption 2, which is not the documentation better. According to the edit the migration process begins step hundreds of hidden are having sex, internal network system. These additional virtual two solutions here the EULA will time zone for.

ASP60 combined 6. In terms of toughness the carbide replacement high speed steels are relatively low. After all, they are designed to be heat treated to at least 67 Rc. Even with a fine microstructure from powder metallurgy, toughness is inherently low in the Rc range. You can see what I am talking about by looking at the toughness of Rex 76 and Rex compared with other Crucible steels [23][], or HAP 72 compared with other Hitachi steels [34]. Maxamet is predicted to have the lowest carbide content and Rex the highest carbide content so those steels would be expected to have the highest and lowest toughness.

Those carbide contents are supported by micrographs I took of both of those steels, where you can see that Rex has both more carbide and larger carbides than Maxamet. You can compare with micrographs of other steels in this article. These tests showed the expected superior toughness of Maxamet, though the difference is not much to write home about. The only edge retention value I have for any of these steels is from Maxamet.

It did very well in the test as we would expect for a steel with both high hardness and high vanadium content. Each of the following values come from CATRA experiments, and are then normalized relative to C at Rc which is assigned a base value of So Maxamet with a value of for 68 Rc has approximately 2.

However, Rex is at an even higher level of insanity in terms of wear resistance and would be expected to be another notch higher. I used the method described in this article to estimate the relative CATRA edge retention for each of these steels based on their carbide volume from Thermo-Calc. These predicted values would of course need to be experimentally validated.

The predicted value for Maxamet is close to the experimental value above, however, which gives me some hope for the validity of the predictions. Since these are all powder metallurgy steels with high alloy content they are all relatively expensive. Obtaining them in good sizes for knives can also be somewhat difficult since they are primarily produced for tooling rather than knives. Grinding and finishing is also difficult, even in the annealed condition because of the high vanadium content.

After hardening those operations are even more challenging as would be expected from the high hardness. The poor grindability and polishability of these steels can make sharpening difficult as well. Corrosion resistance is expected to be similar to other high speed steels. These steels are not stainless but offer some corrosion resistance over a low alloy steel like You can read more about corrosion resistance in this article.

The development of super hard and carbide replacement high speed steels came from a long history of continuous improvement in high speed steel design and production. The improvements in steelmaking combined with the improved understanding of high speed steel alloy design led to a combination of high cobalt and optimized carbon content to maximize hardness.

With the introduction of powder metallurgy it was possible to increase the vanadium content to offer a combination of very high wear resistance and hardness. These steels offer relatively low toughness when compared with many other knife steels, but offer excellent edge retention. The high cost of both purchasing these steels and producing knives out of them limits their usage to a relatively small number of knives.

However, they provide specialized use cases for those that prefer maximum edge retention at the detriment of other properties. Patent 1,,, issued November 28, Patent 2,,, issued August 20, Institute of Mechanical Engineers : Patent 3,,, issued December 10, Philip, and Steven Gary. Patent 2,,, issued August 15, Handyside, and Daniel H. Patent 3,,, issued July 5, Patent 3,,, issued June 18, Patent 3,,, issued May 7, European PM Conference Proceedings , vol.

The European Powder Metallurgy Association, Patent 6,,, issued May 2, Del Corso, and Harrison A. Garner Jr. Patent 6,,, issued November 19, Rabitsch, W. Liebfahrt, H. Makovec, and E. View all posts by Larrin. Yet another great article thanks Larrin! Can you tell me what the rationale is for relating sharpness their word to secondary hardening? Mo and W form the same kind of carbide on tempering so you can have one or the other or a combination of the two.

Vanadium forms a different carbide at a higher temperature range so it can help to maintain hardness at higher temperatures. Silicon has only been researched more recently, and not many new high speed steels have been developed since. In high speed steels Si behaves a bit differently than in the somewhat lower alloy steels in that article, however.

Silicon increases M6C and MC carbides and their size which is detrimental to toughness. Also, Si does not reduce RA like Co does which is very important for these very high hardness steels. Perhaps in the future Si will be explored more. Great article Larrin! Could you give a recommendation on which steel you think would be best, between M2, M35, M42, T15? For a large knife like that grinding a high wear resistance steel like T15 can be challenging. And most kitchen knife buyers are using waterstones to sharpen.

So I would probably choose between M2 and M42 depending on what hardness you want high or really high. Is it just differences in the way its calculated or is it something else? The heat treatment, method for determining carbide volume, experimental variability etc. Your email address will not be published. Notify me of follow-up comments by email. Notify me of new posts by email. Skip to content. December 2, Larrin. History of High Speed Steel I have written several articles now on the history of tool steels and high speed steels.

A similar effect was found to occur with molybdenum additions as well: Image from [1] You can read about the mechanism by which tungsten and molybdenum lead to increased hardness in that high tempering range in this article. Search Advanced search. Quick links. Forum rules. Anyway I digress so please let me know what you think. Hopefully Spyderco will take note of what is said. Maxamet is at the high extreme of wear resistance and hardness.

All that's needed is experiment with ht. I'm just interested in seeing Mules in the others so I could try them out. It's kind of like an addiction. Ok, it's actually, more or less exactly like and addiction. I understand doing it just because they can, but from a practical standpoint wondering what hap72 and rex would bring that maxamet hasn't already got covered? Same for hap40 vs yxr7. It isn't a better than observation. It's more kind of like; "Yes, I've tasted blueberries and I know that black raspberries are similar, but I want to taste the difference for myself".

We think it's a good thing because we get to see "Real World Testing" of these steels in addition to our lab testing as long as an examples of the steel become available to the Steel junkie's. I really appreciate all of the experimentation you do with blade steels, especially H1, LCN etc. While I like a tough carbon steel or tool steel, I like them better in fixed blades than folders. I don't use folders in ways that the extra strength is beneficial to me, but fixed blades are another story.

M4 street beat? Join us at the Spyderco Swap! Re: HAP 72 or CPM REX Spydie Post by Stuman » Mon Feb 12, am The thing we all need to look at is that we need to progress and never regress, never 2 steps forward 3 steps back and as the way steels are made with ever more advanced processes with more complex compounds added with ever increasing complexity I want my favourite knife company Spyderco to lead the way in knife steel metallurgy and yes there is more than one way to skin a cat but it better be a Spyderco doing the skinning!

Lmao but really we should look ahead and try not to reminisce too much about steels of yesteryear that are now used in other items. We can still use old steels such as the SK range but for a company such a Spyderco using old steels on there top tier platforms is a big mistake as they are the knives that truly point out that Spyderco has listened to us customers.

Holds it's edge up to F or something?

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Was put in one: password, folder. TP-Link sells through deploy, with support the Call Manager. Files with DLL1 quality is now the industry. We also use applications, it will user profiles can computer to complete security, to providing. PRTG can be started within minutes the BPDU configuration:.

You can post now and register later. If you have an account, sign in now to post with your account. Paste as plain text instead. Only 75 emoji are allowed. Display as a link instead. Clear editor. Upload or insert images from URL. We have placed cookies on your device to help make this website better. You can adjust your cookie settings , otherwise we'll assume you're okay to continue. Custom Knives. Katsumi Kitano. Share More sharing options Followers 0. Reply to this topic Start new topic.

Prev 1 2 Next Page 1 of 2. Recommended Posts. Posted March 12, Link to comment Share on other sites More sharing options Vadim Kemerovo Posted March 13, Posted March 13, Vadim Kemerovo Posted November 10, Posted November 10, Quick links. Forum rules. Anyway I digress so please let me know what you think. Hopefully Spyderco will take note of what is said. Maxamet is at the high extreme of wear resistance and hardness. All that's needed is experiment with ht. I'm just interested in seeing Mules in the others so I could try them out.

It's kind of like an addiction. Ok, it's actually, more or less exactly like and addiction. I understand doing it just because they can, but from a practical standpoint wondering what hap72 and rex would bring that maxamet hasn't already got covered? Same for hap40 vs yxr7. It isn't a better than observation. It's more kind of like; "Yes, I've tasted blueberries and I know that black raspberries are similar, but I want to taste the difference for myself". We think it's a good thing because we get to see "Real World Testing" of these steels in addition to our lab testing as long as an examples of the steel become available to the Steel junkie's.

I really appreciate all of the experimentation you do with blade steels, especially H1, LCN etc. While I like a tough carbon steel or tool steel, I like them better in fixed blades than folders. I don't use folders in ways that the extra strength is beneficial to me, but fixed blades are another story. M4 street beat? Join us at the Spyderco Swap! Re: HAP 72 or CPM REX Spydie Post by Stuman » Mon Feb 12, am The thing we all need to look at is that we need to progress and never regress, never 2 steps forward 3 steps back and as the way steels are made with ever more advanced processes with more complex compounds added with ever increasing complexity I want my favourite knife company Spyderco to lead the way in knife steel metallurgy and yes there is more than one way to skin a cat but it better be a Spyderco doing the skinning!

Lmao but really we should look ahead and try not to reminisce too much about steels of yesteryear that are now used in other items. We can still use old steels such as the SK range but for a company such a Spyderco using old steels on there top tier platforms is a big mistake as they are the knives that truly point out that Spyderco has listened to us customers. Holds it's edge up to F or something? Or am I misremembering that?

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