Corrosion Resistance of HSS vs Carbon vs SS

K

kevtan

Joined
May 28, 2000
Messages
984
I have found that on 32C deg @ 90% humidity, carried on back pocket of jeans, all of my knives has moisture on the blade. My 710 ats has rust spots while my 710hs uncoated edge don't.

I have found that handmade knives out of industrial hacksaw blade of 1.2 inch wide are very rust resistant. They develope the black carbon patina quickly, but seems to resist rust, if wiped after cutting.

There is an old trick of fruit sellers in Malaysia of cutting pineapple to acid sharpen the edge.

On my carbon blades of handmade old springs, they develope the patina, but still rusts.

So I would grade the steels

Stainless
HSS
Carbon

What do you think?
 
kevtan :

[corrosion resistance ranking]

Stainless
HSS
Carbon
Click to expand...

For light surface rust yes, any alloy content tends to raise corrosion resistance, so plain carbon steels are lower than tool and HSS steels. The cutlery stainless grades are generally not very stain resistant compared to stainless steels in general because of the high carbon percentage and the heat treating which usually maximizes carbide formation. But, even the worse of them should be able to resist the formation of a patina longer than alloy steels. Though they tend to pit worse than even carbon steels if exposed to salt water and other highly corrosive enviroments.

-Cliff
 
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