Super Hard (70 Rc) High Speed Steels – Maxamet, Rex 121, and More Explained

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Pelagic
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Re: Super Hard (70 Rc) High Speed Steels – Maxamet, Rex 121, and More Explained

Postby Pelagic » Tue Dec 03, 2019 1:52 pm

sal wrote:
Tue Dec 03, 2019 1:10 pm
As Shawn stated, it takes, in my opinion, more than one test to find truth, if that's possible? We've done many tests on steels with our CATRA. Still we find questions.

We've changed the thickness and shape of our test mules and we're in the process of retesting everything to verify previous rests.

That's why we really like to get feedback from folks out there actually using the steels. We're really fussy on Heat Treat so we prefer to use our own pieces.

sal
I don't think it is possible!! :D

Especially when CATRA tests knives that are 5-6 degrees off symmetrical, leaves huge burrs and generally cannot get angles right.
Pancake wrote:
Wed Aug 14, 2019 10:20 pm
Are you a magician? :eek:
Nate wrote:
Thu Apr 04, 2019 4:32 pm
You're the lone wolf of truth howling into the winds of ignorance
Doeswhateveraspidercan wrote:
Sat Jun 15, 2019 9:17 pm
You are a nobody got it?

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emanuel
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Re: Super Hard (70 Rc) High Speed Steels – Maxamet, Rex 121, and More Explained

Postby emanuel » Wed Dec 04, 2019 11:55 am

Deadboxhero wrote:
Tue Dec 03, 2019 12:05 pm
Larrin wrote:
Tue Dec 03, 2019 11:22 am
Howdy guys, I have a question. How does T15 compared to Maxamet/Rex121/15V? I don't think I've heard of anyone working with it besides Luong. Is there any data on it as a knife blade? Thanks.

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Re: Super Hard (70 Rc) High Speed Steels – Maxamet, Rex 121, and More Explained

Postby Deadboxhero » Wed Dec 04, 2019 12:40 pm

~approx/similar

Less<Greater

Wear resistance

Rex 45<M4<T15<Maxamet<10v<15v<Rex121

T15=S390

Hardness

M4<Rex45~10v<15v<T15<Maxamet<Rex121
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Triple B Handmade Knives

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emanuel
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Re: Super Hard (70 Rc) High Speed Steels – Maxamet, Rex 121, and More Explained

Postby emanuel » Thu Dec 05, 2019 4:15 am

Thanks Shawn, that covers up in general what I wanted to know.

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Re: Super Hard (70 Rc) High Speed Steels – Maxamet, Rex 121, and More Explained

Postby Haunted House » Thu Dec 05, 2019 9:21 am

Pelagic wrote:
Tue Dec 03, 2019 1:52 pm
sal wrote:
Tue Dec 03, 2019 1:10 pm
As Shawn stated, it takes, in my opinion, more than one test to find truth, if that's possible? We've done many tests on steels with our CATRA. Still we find questions.

We've changed the thickness and shape of our test mules and we're in the process of retesting everything to verify previous rests.

That's why we really like to get feedback from folks out there actually using the steels. We're really fussy on Heat Treat so we prefer to use our own pieces.

sal
I don't think it is possible!! :D

Especially when CATRA tests knives that are 5-6 degrees off symmetrical, leaves huge burrs and generally cannot get angles right.
I believe you missed the ”Our Catra” part, as in Spyderco has their own Catra device and aren’t sending knives off to England to be sharpened & tested by the Catra company.
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Pelagic
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Re: Super Hard (70 Rc) High Speed Steels – Maxamet, Rex 121, and More Explained

Postby Pelagic » Thu Dec 05, 2019 9:34 am

Haunted House wrote:
Thu Dec 05, 2019 9:21 am
Pelagic wrote:
Tue Dec 03, 2019 1:52 pm
sal wrote:
Tue Dec 03, 2019 1:10 pm
As Shawn stated, it takes, in my opinion, more than one test to find truth, if that's possible? We've done many tests on steels with our CATRA. Still we find questions.

We've changed the thickness and shape of our test mules and we're in the process of retesting everything to verify previous rests.

That's why we really like to get feedback from folks out there actually using the steels. We're really fussy on Heat Treat so we prefer to use our own pieces.

sal
I don't think it is possible!! :D

Especially when CATRA tests knives that are 5-6 degrees off symmetrical, leaves huge burrs and generally cannot get angles right.
I believe you missed the ”Our Catra” part, as in Spyderco has their own Catra device and aren’t sending knives off to England to be sharpened & tested by the Catra company.
I don't doubt spyderco's testing, but those results stay in house.
Pancake wrote:
Wed Aug 14, 2019 10:20 pm
Are you a magician? :eek:
Nate wrote:
Thu Apr 04, 2019 4:32 pm
You're the lone wolf of truth howling into the winds of ignorance
Doeswhateveraspidercan wrote:
Sat Jun 15, 2019 9:17 pm
You are a nobody got it?

GarageBoy
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Re: Super Hard (70 Rc) High Speed Steels – Maxamet, Rex 121, and More Explained

Postby GarageBoy » Thu Dec 05, 2019 6:13 pm

All I've learned this as a someone who doesn't use knives enough, fancy steels are lost on me, yet I want them

Is there a theoretical upper limit to steel hardness?

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Re: Super Hard (70 Rc) High Speed Steels – Maxamet, Rex 121, and More Explained

Postby Larrin » Fri Dec 06, 2019 6:36 am

GarageBoy wrote:
Thu Dec 05, 2019 6:13 pm
Is there a theoretical upper limit to steel hardness?
Not really. The highest I have seen is in the 72-73 Rc range. Though the Rockwell C scale is not particularly good for high hardness measurements, as the standards only go up to 65 or 70 Rc, and it becomes quite nonlinear above 70 Rc. There are also drawn wire alloys that reach incredibly high tensile strengths (6300 MPa) but they aren't measured with hardness as far as I know. Perhaps that would be equivalent to 77 Rc or so.
http://www.KnifeSteelNerds.com - Steel Metallurgy topics related to knives


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