Chromium content=rust??? NOT!!!!

R Dockrell

R Dockrell

Joined
Mar 26, 2000
Messages
658
I have been working with a steel called Vanadis 4 it is only speced to have 8% chromium.
In the annealed state it rusts to the extent of surface discoloration that rubs off but no pitting from the grind and dip to cool process during grinding when left wet for less than an hour.
A couple of days ago I tried to cold blue a blade. No dice!!! Not even a stain on the hardened and tempered steel, 600 grit finish. This morning I took one of my test blades and set it on a wet rag at 7:00 am. I checked it at 5:00 pm. when I got home nothing not even a stain.
The other test blade I took to work and everyone in the lunch room used it. The rule was That it couldn't even be wipe off. It sliced up two tomatos a onion and some salami. It then sat for 4 hours uncleaned. Not even any patina, no color no stains at all. The blade had no preservative on it and had been washed this morning with hot soapy water.
Whats up?? I can usually rust a knife without even trying even D2 and ATS-34 with there higher chromium content.
Any explanations???

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Robert
Flat Land Knife Works
rdblad@telusplanet.net
http://members.tripod.com/knifeworks/index.html
 
You should stop dreaming at work and buy some tuff cloth like the rest of us do!

Kidding! this sounds interesting Robert. I'll be watching eagerly for input...

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"Come What May..."
 
Paul
Yes I got the two knives back, thankyou. What did you coat them with???? You have been using V4 for a while, have you noticed any out of the ordinary rust resistance? I can't tell the differance in the HT between yours and mine by cutting tests. Guess I got lucky.
Were they at all rusty or tarnished when you got them back, before you cleaned them up and returned them.

Walt
C 1.5 Si 1.0 Mn 0.4 Cr 8.0 Mo 1.5 V 4.0

I finally got some rust in deeper scratches (test blades fairly rough)with a salt water aplication.

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Robert
Flat Land Knife Works
rdblad@telusplanet.net
http://members.tripod.com/knifeworks/index.html

[This message has been edited by R Dockrell (edited 03-14-2001).]

[This message has been edited by R Dockrell (edited 03-14-2001).]
 
Robert: They were in the field for at least two weeks, When i got them back there was some staines on them but no rust. Edges were still sharp but could not shave hare with them. The man that used them said they both preformed well. Paul.
 
Before I lost most of my memory, I used to be able to remember a great deal of trivia/interesting facts, etc. Now, I only keep little bits and pieces, hardly enough to make me dangerous, even.

I'm certain that I read somewhere that when alloy steel is made the carbides formed by the various elements are either formed in a certain sequence, or that only a certain percentage of the carbon is available to form carbides. In some steel discussed in the article, though it had a lower amount of chromium, nevertheless most of the chromium was available for the formation of chromium carbides, and it was much more stainless than one would have expected given the percentage of chromium in the recipe.

Then again, this memory may only be from a dream. One thing is sure, I'm no metallurgist nor scientist. Am just a guy with a poor memory, but interested in the various steels and how they perform in knives. Never heard of your steel V-4 before. Isn't it reasonably close to CPM3V?
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(Can't figure out why am so willing to expose myself to taunts and abuse.
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Asi es la vida

Bugs
 
Robert,
If you want to see something rust, send it down here and I'll put the knives in my father's boat down at Crystal Beach. On the Gulf Coast, even gold will rust!
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