crucible steels?

[Franco G]

Something new about the S35V (Niobium steel)?
Chris Reeve introduced it in kitchen knives - it is supposed to be an improvement over S30V.
Sal Glesser praised S35V steel as an excellent one.

Franco

 

[cotdt]

Something new about the S35V (Niobium steel)?
Chris Reeve introduced it in kitchen knives - it is supposed to be an improvement over S30V.
Sal Glesser praised S35V steel as an excellent one.

Franco

Crucible's website has nothing on S35V, where can one find info?

I would like an S30V variant that has higher attainable hardness, maybe add 2% tungsten and 1% cobalt, remove 1% chromium, keep vanadium at 4% and molybdenum at 2%. I don't know the chemistry of Niobium but maybe that can be added in too. Then the steel can attain 62-64 hrc while being tougher than the other stainless steels in its class at the same hardness.

 

[Phil Wilson]

Mike, I have tested a couple and they were RC 58+/-. I have not compared any to the higher hardness, just went for the higher value as soon as I got some of the material. Phil

 

[Phil Wilson]

Crucible's website has nothing on S35V, where can one find info?

I would like an S30V variant that has higher attainable hardness, maybe add 2% tungsten and 1% cobalt, remove 1% chromium, keep vanadium at 4% and molybdenum at 2%. I don't know the chemistry of Niobium but maybe that can be added in too. Then the steel can attain 62-64 hrc while being tougher than the other stainless steels in its class at the same hardness.

The addition of Niobium to S30V would have a very positive effect. Niobium is a strong carbide former and makes a hard very small complex carbide. This would enhance ductility and corrosion resistance and allow for a little higher working hardness. There is some material available but I haven't had a chance to get my hands on any yet. Phil

 

[Sal Glesser]

As I understand, the "name" for the steel is now CPM-S35VN. That's the way Chris Reeve has posted on his web site and that's the way we're listing it on our new steel chart.

I also heard a rumor that Crucible's division that makes blade steels has a buyer and they might be able to continue providing us with their great blade steels.

Also, while some of the mangement has left Crucible, Scott Devanna is still hanging in there with Crucible ( I respect that kind of loyalty) and will still be involved with the knife industry. I haven't had confirmation from Scott, but it does look more promising than it did several weeks ago.

sal

 

[J. Rosa]

As I understand, the "name" for the steel is now CPM-S35VN. That's the way Chris Reeve has posted on his web site and that's the way we're listing it on our new steel chart.

I also heard a rumor that Crucible's division that makes blade steels has a buyer and they might be able to continue providing us with their great blade steels.

Also, while some of the mangement has left Crucible, Scott Devanna is still hanging in there with Crucible ( I respect that kind of loyalty) and will still be involved with the knife industry. I haven't had confirmation from Scott, but it does look more promising than it did several weeks ago.

sal

This is great news Sal. Thank you for the brief update. From what I have heard S35VN is a great steel. I have a knife made of it from another maker and some billets of my own cut out waiting to be ground. Another maker who has used it told me it was definitely tougher and more chip resistant than S30V and takes a fine edge. Once I have made a blade or two from the stock I have I will comment more on its performance but for a stainless this seems very promising. Oh, it is also supposed to finish a lot easier than S30V. Grinding it seemed much easier to me than 3V.

 

[Joshua J.]

As I understand, the "name" for the steel is now CPM-S35VN. That's the way Chris Reeve has posted on his web site and that's the way we're listing it on our new steel chart.

I also heard a rumor that Crucible's division that makes blade steels has a buyer and they might be able to continue providing us with their great blade steels.

Also, while some of the mangement has left Crucible, Scott Devanna is still hanging in there with Crucible ( I respect that kind of loyalty) and will still be involved with the knife industry. I haven't had confirmation from Scott, but it does look more promising than it did several weeks ago.

sal

Yay, there's hope!

I was just looking through some competitors spec sheets, an equivalent to S110V seems to be very difficult to come across.
Here's hoping for the best.

 

[gunmike1]

Mike, I have tested a couple and they were RC 58+/-. I have not compared any to the higher hardness, just went for the higher value as soon as I got some of the material. Phil

I give applause to Keshaw for even using S110V, and I'm sure the Shallots have excellent edge retention as is. It must have been hell on their grinders, and the price point is really good on those knives. However, I would bet a re-hardening to 63 RC would make it like a totally different steel, as 5 points on the Rockwell scale is a massive jump in hardness (and strength and edge retention).

Mike

 

[Phil Wilson]

I give applause to Keshaw for even using S110V, and I'm sure the Shallots have excellent edge retention as is. It must have been hell on their grinders, and the price point is really good on those knives. However, I would bet a re-hardening to 63 RC would make it like a totally different steel, as 5 points on the Rockwell scale is a massive jump in hardness (and strength and edge retention).

Mike, I think 58/59 is a pretty good hardness for CPM S110V for a knife intended for a very wide range of users. From the data sheet it looks like this would provide good toughness and also this is the hardness point that provides the best corrosion resistance. To get 63/64 requires a 2150 high heat, LN2 cycle and a 975 temper. The trade off is some loss of corrosion resistance (still as good or better than 90V) and some caution on not exceeding the stress. This would show up as chipping on a thin grind and edge. So far I have tested this by whittling fir and twisting the blade out of the cut with no evidence of this on a blade that is 0.010 behind the edge. Also no evidence slicing 5/8 rope with up to 25 lbs force. So seems if it will do this at 63 then 58/59 is pretty safe. I will have to make some blades at 60 or so and do some side by side testing. Phil