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Sean Hill

2205 Duplex stainless steel

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Hi everyone, I have a question about 2205 Duplex. 

Has anyone used this for knife blades with good success?

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Cr
Chromium    22.0 - 23.0%
Ni
Nickel    4.5 - 6.5%
Mn
Manganese    2.0% max
Si
Silicon    1.0% max
P
Phosphorous    0.03% max
S
Sulfur    0.02% max
C
Carbon    0.03% max
N
Nitrogen    0.1 - 0.2%
Mo
Molybdenum    3.0 - 3.5%
Fe
Iron    Balance
 

See that 0.03% carbon?   Carbon is (mostly) what determines if a steel is hardenable, and it generally needs to be at 0.6% or better to be a good blade steel.  This stuff has carbon so low it's almost an impurity rather than an alloying element.  Looks extremely corrosion-resistant, though!  

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Thank you for the responses. I have some drops from a recent project of 1/4” plate and was hoping it could be hardened, but didn’t think it could due to almost nonexistent carbon. Thanks again for helping verify this. 

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Would be good for handle furniture though.................;)

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For those wondering (probably nobody), the "duplex" means austenite and ferrite, which pretty much tells you it isn't hardenable right in the name.  

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22 hours ago, Jerrod Miller said:

For those wondering 

I was, thanks!

 

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