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  • #16
    Re: stainless screws VS Ridgid 18v impact driver

    you mention that you are using ASTM 305? screws. This is an almost unknown, and definately never used alloy in Europe. It doesn't even have an SS (Swedish Standard) Nr. The mixture, 18.12 is using more Nickel, and less Chrome than 316, to up the corrosion resistance. When the nickel is "out of balance" with the chrome, you get an undesired brittle alloy.
    Your problem will be less using 304, or 316 depending on the required corrosion resistance.
    However VASandy and CWSmith are on the right track, avoid using impact drivers on stainless, as it "work hardens". Use all the torque you want, that way Stainless is amazingly strong.

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    • #17
      Re: stainless screws VS Ridgid 18v impact driver

      Sorry Disaster, it was your answer I was refering to! As regards Knife blades, you are right on. Normal stainless is useless for this. Knifeblade stainless otherwise known as "Martensitic" Stainless Steel, contains carbon, to enable hardening. Carbon is usually a No-No in stainless, as it causes intercrystaline corrosion. As a rule, good Martensitic comes from France or Switzerland. The percentages in a succesfull Martensitic alloy are down to 1/1000, and are of course, closely guarded secrets.
      Having said this, some of the finest Martensitic blades are from the USA, Buck Knife for example. I assume that the steel is US made. It would be nice to know if this was the case.

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