[Jewelry making - Article 00021] - Re: [Orchid] Piercings-Surgical Steel

[Martin Niemeijer]

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    Hello Kate, I do not know, that Stainless steel 316L is the same as
    surgical steel. I have read it once,  but I am not shore this steel
    is good enough.. As a industrial engineer I do now some about the
    Stainless steels. The 316 is a medium resistant stainless. A better
    easy available one is 321. It has al to do with the amount of alloy
    elements. the 316L has a more resistant against cracks, when weld
    than the standard 316. 316V has more strength at higher temperatures.
    I will not go to far in detail, but if anybody needs to know more
    they can mail me more specified questions. Now the heating up
    question; It is trough that if you (over) heat the steel that the
    chemical properties change, but this is only at the surface. The
    stainless resistance is based on chromium oxides on the surface. an
    generally al steels containing more than 13% chromium can be called
    corrosion resistant in an environment where oxygen is. The layer of
    chromium oxides is protecting it against further corrosion. In
    reducing, anaerobe environments it will be eaten away because there
    is no chromium oxide on the surface to give a protecting closed
    layer. If you get discolouration due to heating the chromium contend
    on the surface is below the 13% and you can get rust. The ferrite
    particles are getting to the surface and are pushing the chromium
    inwards. A human body is rather chemical aggressive, and will than
    attack the stainless steel. You need to grind of , or etch, the
    overdose of ferrite away. (remove the discolouration) And a close
    protected layer gets back. I simple way is to put it in hot 10%
    H2SO4. 

Greeting
Martin Niemeijer

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