Which Knife Steels Have the Best Corrosion Resistance
Which Knife Steels Have the Best Corrosion Resistance
I generated a simple method for predicting the corrosion resistance of knife steel, and then ranked them all. https://knifesteelnerds.com/2019/01/14/ ... esistance/
http://www.KnifeSteelNerds.com - Steel Metallurgy topics related to knives
-
- Member
- Posts: 99
- Joined: Sat Dec 29, 2018 4:45 pm
Re: Which Knife Steels Have the Best Corrosion Resistance
LC200N would be a great choice.
-
- Member
- Posts: 1158
- Joined: Tue Jan 30, 2018 1:00 pm
- Location: Central Mn
Re: Which Knife Steels Have the Best Corrosion Resistance
Awesome, thanks for your hard work.
I can do all things through Christ who strengthens me. Philippians 4:13
Adam
Adam
Re: Which Knife Steels Have the Best Corrosion Resistance
LC200N is the same as Cronidur 30
http://www.KnifeSteelNerds.com - Steel Metallurgy topics related to knives
-
- Member
- Posts: 2618
- Joined: Tue Jul 10, 2018 6:31 pm
Re: Which Knife Steels Have the Best Corrosion Resistance
Based on the ones I own and use allot from greatest to least corrosion in this order based upon real use and observation.
H1 / LC200N Cant get either to rust although I think something rusted on top of my H1 as there are rust marks in the same area on both side of the blade in the same area like it was left trapped inside something will have to flitz it tonight and see.
S110V
S90V
CTS-204P / M390
M390
S35VN
Elmax
VG-10
S30V
H1 / LC200N Cant get either to rust although I think something rusted on top of my H1 as there are rust marks in the same area on both side of the blade in the same area like it was left trapped inside something will have to flitz it tonight and see.
S110V
S90V
CTS-204P / M390
M390
S35VN
Elmax
VG-10
S30V
Re: Which Knife Steels Have the Best Corrosion Resistance
Another great article. I long ago opted out from carrying ZDP-189 around saltwater. While classified as stainless, I found it rusts and pits much quicker than most other "stainless" steels. Your explanation helps to better understand why. Though the list confirms many of my experiences, I'll definitely keep this for future reference. While other factors affect steel and knife choice, this is an excellent guide to stainless qualities. Thanks for your time, effort, and expense in helping us to better understand steel qualities.
-
- Member
- Posts: 2618
- Joined: Tue Jul 10, 2018 6:31 pm
Re: Which Knife Steels Have the Best Corrosion Resistance
Apologies did not realize you took the time to make such a nice article. Interesting to see where things landed.
Re: Which Knife Steels Have the Best Corrosion Resistance
Thanks for the great article, Larrin.
I have a question: how do your PREN approximations ....
- Acetic acid = Cr + 0.45(Mo + 0.5W)
- Aqua-Regia = Cr + 0.79(Mo + 0.5W)
- Pitting potential = Cr + 2.6(Mo+0.5W)
... work for steels with very high Tungsten content ? For example, CPM Rex 45 with 6.25% W, or Maxamet with 13% ? We haven't seen a lot of corrosion on knives in those two steels in practice (yet), and I was wondering if Tungsten was to take credit for this.
Thanks,
Roland.
I have a question: how do your PREN approximations ....
- Acetic acid = Cr + 0.45(Mo + 0.5W)
- Aqua-Regia = Cr + 0.79(Mo + 0.5W)
- Pitting potential = Cr + 2.6(Mo+0.5W)
... work for steels with very high Tungsten content ? For example, CPM Rex 45 with 6.25% W, or Maxamet with 13% ? We haven't seen a lot of corrosion on knives in those two steels in practice (yet), and I was wondering if Tungsten was to take credit for this.
Thanks,
Roland.
-
- Member
- Posts: 5858
- Joined: Wed Jan 03, 2018 8:01 pm
- Location: Missouri, USA
Re: Which Knife Steels Have the Best Corrosion Resistance
Thanks Larrin, great article!
- Connor
"What is a man profited, if he shall gain the whole world, and lose his own soul?"
"What is a man profited, if he shall gain the whole world, and lose his own soul?"
-
- Member
- Posts: 99
- Joined: Sat Dec 29, 2018 4:45 pm
Re: Which Knife Steels Have the Best Corrosion Resistance
LC200N C 0.38 Cr 15.08 Mo .95 N .50 Mn 1.00
Cronidur30 C 0.25 to 0.35 Mn 1.00 Si 1.00 Cr 14.0 to 16.0 Mo 0.85 to 01.10 Ni .50 N 0.30 to 0.50
Cronidur30 C 0.25 to 0.35 Mn 1.00 Si 1.00 Cr 14.0 to 16.0 Mo 0.85 to 01.10 Ni .50 N 0.30 to 0.50
Re: Which Knife Steels Have the Best Corrosion Resistance
As always, many thanks Larrin. :)
A day without laughter is a day wasted. ~ Charlie Chaplin
Re: Which Knife Steels Have the Best Corrosion Resistance
Maxamet is in the table. Rex45 is not but it is a Mo-W steel just like M2 and M4 (plus cobalt) so calculations would probably be similar to those two.ferider wrote: ↑Mon Jan 14, 2019 3:02 pmThanks for the great article, Larrin.
I have a question: how do your PREN approximations ....
- Acetic acid = Cr + 0.45(Mo + 0.5W)
- Aqua-Regia = Cr + 0.79(Mo + 0.5W)
- Pitting potential = Cr + 2.6(Mo+0.5W)
... work for steels with very high Tungsten content ? For example, CPM Rex 45 with 6.25% W, or Maxamet with 13% ? We haven't seen a lot of corrosion on knives in those two steels in practice (yet), and I was wondering if Tungsten was to take credit for this.
Thanks,
Roland.
http://www.KnifeSteelNerds.com - Steel Metallurgy topics related to knives
Re: Which Knife Steels Have the Best Corrosion Resistance
I believe you meant to put 0.30C and 15.0Cr unless you have a different composition than the datasheet that you are referencing.steeljustice wrote: ↑Mon Jan 14, 2019 3:26 pmLC200N C 0.38 Cr 15.08 Mo .95 N .50 Mn 1.00
Cronidur30 C 0.25 to 0.35 Mn 1.00 Si 1.00 Cr 14.0 to 16.0 Mo 0.85 to 01.10 Ni .50 N 0.30 to 0.50
http://www.KnifeSteelNerds.com - Steel Metallurgy topics related to knives
Re: Which Knife Steels Have the Best Corrosion Resistance
Don't mean to argue, Larrin, have wondered about these PREN indicators before ..... The Maxamet W contents in the table is not what I see on Carpenter's website (https://www.cartech.com/en/product-solu ... amet-alloy). Per Carpenter, it has 13% W, and - for example - the Pitting potential PREN should be 21.3, higher than any other entry in the table. What am I missing ? Thanks.Larrin wrote: ↑Mon Jan 14, 2019 4:33 pmMaxamet is in the table. Rex45 is not but it is a Mo-W steel just like M2 and M4 (plus cobalt) so calculations would probably be similar to those two.ferider wrote: ↑Mon Jan 14, 2019 3:02 pmThanks for the great article, Larrin.
I have a question: how do your PREN approximations ....
- Acetic acid = Cr + 0.45(Mo + 0.5W)
- Aqua-Regia = Cr + 0.79(Mo + 0.5W)
- Pitting potential = Cr + 2.6(Mo+0.5W)
... work for steels with very high Tungsten content ? For example, CPM Rex 45 with 6.25% W, or Maxamet with 13% ? We haven't seen a lot of corrosion on knives in those two steels in practice (yet), and I was wondering if Tungsten was to take credit for this.
Thanks,
Roland.
Re: Which Knife Steels Have the Best Corrosion Resistance
Most of the values in the table do not match the bulk composition, as it is a calculation of alloy in solution after heat treatment.ferider wrote: ↑Mon Jan 14, 2019 4:53 pmDon't mean to argue, Larrin, have wondered about these PREN indicators before ..... The Maxamet W contents in the table is not what I see on Carpenter's website (https://www.cartech.com/en/product-solu ... amet-alloy). Per Carpenter, it has 13% W, and - for example - the Pitting potential PREN should be 21.3, higher than any other entry in the table. What am I missing ? Thanks.
http://www.KnifeSteelNerds.com - Steel Metallurgy topics related to knives
Re: Which Knife Steels Have the Best Corrosion Resistance
I see. Thanks !
-
- Member
- Posts: 99
- Joined: Sat Dec 29, 2018 4:45 pm
Re: Which Knife Steels Have the Best Corrosion Resistance
think these are the Data sheets i found.
http://www.zknives.com/knives/steels/lc_200_n.shtml
http://www.righton.co.uk/datasheets/Bea ... 8_405.ashx
http://www.zknives.com/knives/steels/lc_200_n.shtml
http://www.righton.co.uk/datasheets/Bea ... 8_405.ashx
Re: Which Knife Steels Have the Best Corrosion Resistance
This is awesome! Very nice work! Thank you.
I collect them all, and use them all! I use the excuse, "I'm trying to find the perfect one", but in reality, they are all perfect in their own way!
- SpyderEdgeForever
- Member
- Posts: 6325
- Joined: Mon Jul 23, 2012 6:53 pm
- Location: USA
Re: Which Knife Steels Have the Best Corrosion Resistance
Thank you Larrin. Edge-holding is important to me but my two main big properties I like in a knife steel are corrosion-resistance and toughness.
- SpyderEdgeForever
- Member
- Posts: 6325
- Joined: Mon Jul 23, 2012 6:53 pm
- Location: USA
Re: Which Knife Steels Have the Best Corrosion Resistance
By the way everyone, look which steel is nearly at the top of the chart: SANDVIK 14C28N! Just as I thought! :) :) :)