9cr13?

i have been searching chinese knife websites lately and they say 440c is the same as it. 8cr13 is about the same as aus8, 9cr13 should have more carbon than 8cr13 if i'm reading the designations right.
 
kungfucowboy said:
i have been searching chinese knife websites lately and they say 440c is the same as it. 8cr13 is about the same as aus8, 9cr13 should have more carbon than 8cr13 if i'm reading the designations right.
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You are reading the designations correctly. Yes, it should have more carbon.

If you look at the Benchmade Blade information page, the full alloy name is: 9Cr13CoMoV. It sometimes gets shortened in the knife descriptions.
http://www.benchmade.com/about_knives/our_blades.asp

I have a Benchmade Mini-Pika II. It has the same 9Cr13CoMoV blade steel as the Nagara. It does not quite match the edge retention of 440C. Both blades have a hardness of 58HRC.

In side by side manila rope cutting, the Mini-Pika II, with measured blade hardness of 58, had better edge retention than a Ka-bar Large Dozier with an AUS8 blade having a measured hardness of 59.

So, in edge performance, 9Cr13CoMoV is better than AUS8, but not quite as good as 440C if all are taken to the same hardness.
 
Another Question (might as well add it here instead of starting another thread): is 440c better than AUS 8?
 
jiggyfly16 said:
Another Question (might as well add it here instead of starting another thread): is 440c better than AUS 8?
Click to expand...

Define "better".

440C is noticeably better in edge holding than AUS8, though I find it is noticeably easier to get a very fine edge on AUS8 than to get the same edge on 440C.

AUS8 takes a very fine edge and holds it for longer than 420HC or AUS6, assuming all are heat treated to the same hardness.

Be advised:
There are a lot of knives made in China that are labeled "440C" that are actually something else. My comparisons only hold for knives with actual 440C. A lot of folks get a bad impression of 440C because what they think is 440C is actually a lesser alloy.
 
I also have a blackjack grunt, and I believe that it also has that type of steel.I had tried to sharpen the knife, but the blade seemed to chip really easily. Is that a result to other knife owners that have that type of steel?:confused:
 
I have a grunt and went ahead and convexed it. No chipping,but I can't seem to get it as sharp as some other convexed blades.
 
knarfeng said:
Define "better".

440C is noticeably better in edge holding than AUS8, though I find it is noticeably easier to get a very fine edge on AUS8 than to get the same edge on 440C.

AUS8 takes a very fine edge and holds it for longer than 420HC or AUS6, assuming all are heat treated to the same hardness.

Be advised:
There are a lot of knives made in China that are labeled "440C" that are actually something else. My comparisons only hold for knives with actual 440C. A lot of folks get a bad impression of 440C because what they think is 440C is actually a lesser alloy.
Click to expand...

what about boker 440C?
how does that hold up?
 
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OK, i am chinese guy, manufacturing these materials.
China grade 9Cr18MoV equals to SUS440C and ASTM 440C.
However, by adding Mo and V elements, it will get better hardness and anti wear resistance.

For 9Cr13, uhhh, i think, we have 9Cr13MoVCo or 9Cr13CoMoV, like Aus10.
They are used to make scissors, high quality knives.

420HC grade, 4Cr13, HRC 56 after heat treatment.
Condortk use this material, check their website: www.condortk.com

Aus8, ok, it equals to 8Cr14MoV or 8Cr13MoV grade.
Mostly, it's used to make surgical instruments and knives.

Anybody who wanna more info, kindly contact me.
Skype: paul_luhongxiang

Good luck.
 
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