Is chrome-steel BB rust-resistant?

Is chrome-steel rust-resistant?
I have some ball bearings made from chrome-steel working in humid
environment. I wonder if they need more care than stainless BB.
Thanks,
Alex
Reply to
Alex
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I don't remember the chemistry (physical or metallurgical) but I think chrome usually puts an oxide layer (chromium oxide) on the steel.. but ISTR it needs like 10% Cr to do it.. I think standard chrome steel has only a few % to add strength (as e.g. Cr-V steel) or to reduce required carbon or something (or was that Ni?). Or just nevermind... ;)
Tim
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Reply to
Tim Williams
Alex, I use a chrome steel ball bearing as a roller running on pipe in a greenhouse. That's a humid location if ever there was one. They rust, but stay shiny where they contact the pipe. However, the other bearing steels 50200? rust away in a VERY short time. We switched to chrome steel from 440 stainless because when you use a couple of hundred on every job it gets real expensive, unless you can plunk down the cash to buy say 10,000 bearings at one pop.
Gary H. Lucas
Reply to
Gary H. Lucas
52100, the most common bearing steel, is considered a chrome steel, but the chromium content is not high enough to give any rust resistance. The price of 440C balls is not much higher than 52100 in small sizes; the price difference becomes significant with larger balls.
Ned Simmons
Reply to
Ned Simmons
Those ceramic balls don't rust very easily. :-)
Reply to
Glen
It's better than carbon steel but not corrosion resistant.
Reply to
Jeff Finlayson
Nor brass, or bronze or monel, or nickel or wood or plastic or stone
Brian W
Reply to
Brian Whatcott
Materials have their virtues and defects - brittleness, cold flow, low yield, creep, granularity - they all have a place.
Brian W
Reply to
Brian Whatcott

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