Question to Kershaw - What is SG2?

nozh2002

nozh2002

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This question and similar which I asked in different threads seems to be lost, so let it be separate thread then.

Kershaw never actually sad anything about SG2.

In different post we speculated that it may be same as Fallkniven laminated 3G blades with SGPS inside (which is actually 62HRC), but we never have direct answer form Kershaw what actually SG2 is, what it's composition etc...

May be now after so many models were made with SG2 Kershaw can tell us what it is?

I should note that in Japanes traditions not to tell anything about steel - I spend several monthes and great effort to find out that on my "Samurai bowie" from G-Sakai is SRS15 and 63HRC (it take direct call from my friend in Japan to webmaster and then she find everything out).

I guess same happening with Kershaw (also Japanese company) or at least this is happening in Japanese side of Kershaw, which supply steel to US manufacturing plant.

I hope that Kershaw will clear that out, because steel hardness and composition provides great marketing value to the company, at least in this forums.

So, please tell as what is SG2?

I should note that Fallkniven actually provides full information about their 3G steel - hardness and composition...

Thanks, Vassili
 
super gold -if i remember it is a powder steel-

i do remember reading something about it
 
it's a super duper steel... what's your problem? ;)

Ok, I was wondering the same thing. Specialty steels are not Kershaws bag (as far as I know), so that's perhaps why they don't spend a lot of time explaining. The 2 knives in SG2 were MICRO-runs compared to their bread and butter.

I have HEARD that Kai has some major connections to get ahold of this pretty closely guarded steel (at least to this point). That might be another reason why.

Anyway, I did find some info out there and I think the name of the manufacturer has been explained or listed as well.. but I didn't keep it. Small old company... no Hitachi ;)

Anyway... time will tell but the steel is my current favorite as it never seems to dull (in my world)
 
SG2(Super Gold 2) Laminate Steel
SG-2 is a powdered steel, which can be tempered to an even greater strength than VG-10. It is extremely dense steel with no imperfections or weak points. This increases its Rockwell hardness to 62-63, ensuring a very sharp, smooth and durable edge.

SG2 is clad with two layers of a softer stainless steel (410) that provides additional strength, flexibility, and resistance to corrosion. The result of this structure is that SG2 blades will stay sharp longer than other steels.
 
Kershaw claims a Rockwell Hardness of 64 for the SG2 in its Shun kitchen knives.
 
Here's my guess.

I think it is manufactured by Takefu Special Steel Co., Ltd. 21-2-1, Shiromaru-cho,Echizen City, Fukui Pref. 915-0857 Japan

Try here for a chart of their steels and heat treats.

They describe SG1 and SG2 like this - "Ultra hyper qualityblade steel excel at four major requirements on knives."
 
kneedeep said:
Here's my guess.

I think it is manufactured by Takefu Special Steel Co., Ltd. 21-2-1, Shiromaru-cho,Echizen City, Fukui Pref. 915-0857 Japan

Try here for a chart of their steels and heat treats.

They describe SG1 and SG2 like this - "Ultra hyper qualityblade steel excel at four major requirements on knives."
Click to expand...


YES... I remember that now. thanks!
 
Tim Galyean said:
SG2 is:

C: 1.20-1.30
Cr: 14.0-15.0
Mo: 2.8-3.5
V: 1.8-2.0
Click to expand...

Thanks, Tim,

So this is little bit different then SGPS - has bit less Carbon, but otherwise it is same:
(SGPS)
C: 1.4
Cr: 15
Si: 0.5
Mo: 2.8
Mn: 0.4
S: 0.03
P:0.03
V: 2.0

Thanks, Vassili.
 
OregonEdge said:
I : G
S : O
T : O
H : D
A : ?
T : !
Click to expand...

This mean that SG2 is othe rname for SGPS which already developed reputation of very good steel. It was introduced while ago by Fallkniven, but they have only tiny little knives with it. I remember some reports suggesting it is better then ZDP189. So it give some hope, however formal testing is only what really can tell how good it holds the edge.

Thanks, Vassili.
 
hmmm... are there pictures of these little knives? Just curious. and THANKS for the info! ;)
 
Here:

Fallkniven-U2-09.jpg


...may be this one is not too tiny, but still kind of small delicate gentlemen folder.

Fallkniven-P-04.jpg


BTW - For that one sharpness was - 90g (vs 20g by Kershaw).
 
nozh2002 said:
This mean that SG2 is othe rname for SGPS which already developed reputation of very good steel. It was introduced while ago by Fallkniven, but they have only tiny little knives with it. I remember some reports suggesting it is better then ZDP189. So it give some hope, however formal testing is only what really can tell how good it holds the edge.

Thanks, Vassili.
Click to expand...

SGPS = "Super Gold Powder Steel"
 
nozh2002 said:
This mean that SG2 is othe rname for SGPS which already developed reputation of very good steel. It was introduced while ago by Fallkniven, but they have only tiny little knives with it. I remember some reports suggesting it is better then ZDP189. So it give some hope, however formal testing is only what really can tell how good it holds the edge.

Thanks, Vassili.
Click to expand...

Try this link to cutlery science's knife blade materials web site look under stainless steels; bottom line, there is a link to SGPS blades.
I'm kinda new here, probably most everybody has seen this sight but I use it a lot to educate myself on blade steels. I hope this helps.

http://www.cutleryscience.com/reviews/blade_materials.html
 
SPGS ( or 3G) must be SG1, as opposed to Kershaws SG2. They are both very good cutlery steels. I have the U2 and TK4 , plus now the SG2 blur and the JYD2 TI SG2. The JYD 2 Ti SG2 is probably the sharpest out of the box knife I've ever had. Kershaw has done a heck of a job with it. It's amazing in fact. Much care is needed in cleaning or wiping it off. It will cut through silicone cleaning cloths and get you pretty easily. Joe
 
dmonay said:
Try this link to cutlery science's knife blade materials web site look under stainless steels; bottom line, there is a link to SGPS blades.
I'm kinda new here, probably most everybody has seen this sight but I use it a lot to educate myself on blade steels. I hope this helps.

http://www.cutleryscience.com/reviews/blade_materials.html
Click to expand...

This is Cliff Stamp web page - I am not going there, wasting my time on his "CUTLERY SCIENCE". Sorry, already went though this.

Thanks, Vassili.
 
The Mastiff said:
SPGS ( or 3G) must be SG1, as opposed to Kershaws SG2. They are both very good cutlery steels. I have the U2 and TK4 , plus now the SG2 blur and the JYD2 TI SG2. The JYD 2 Ti SG2 is probably the sharpest out of the box knife I've ever had. Kershaw has done a heck of a job with it. It's amazing in fact. Much care is needed in cleaning or wiping it off. It will cut through silicone cleaning cloths and get you pretty easily. Joe
Click to expand...

It is for sure sharpest production knife ever - I did my sharpness test - 30g and it splitting hair. I only had FFD2 blade form DiamondBlade sharper then this (20g), but for $400 and it is more experimental then production knife.

All Other knives far behind one the best so far - 50g, all other - 60, and Fallkniven 90g.

All out of the box sharpness is here on the first post:
http://www.bladeforums.com/forums/showthread.php?t=509097

I am not sure is SGPS - SG1 or not. Information from Japanese is as usual kind of foggy and you may never know for sure. I thik it is marketing who came up with SGPS, and it may be SG1 as well as SG2 behind this name (picked by Fallkniven marketing I assume).

May be Tim clearify this also - is it SGPS or not?

Thanks, Vassili.
 
There was a contact page on the Takefu page I linked to in post #6.
It might be worth asking them if there are other trade names for their SG1 and SG2 (both are listed as laminated steels, by the way, so it seems like they might be the right ones.)
 
Vassili, if you get the chance try out the new Spyderco Stretch 2 ZDP. It seems to be in the same class as the SG2 JYD sharp wise. They both are amazing. It makes me wonder what knives will be like in 10 years. We've come a long way in the last 10, that's for sure. Joe
 
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