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Hardness of Nickel-Phosphorus plating





October 26, 2008

I have stainless tubes plated by Nickel-Phosphorus (near 88%Ni-12%P) chemical coating. The surface hardness is 55-57HRC at room temperature. My question is what hardness I could reach after heating up to 600-650C deg?
In another words, what hardness degradation I have to expect?

Anatoly Sheyn
technological engineer - Israel



October 29, 2008

Hi Anatoly,

We do Electroless Nickel Plating over brass components. After Plating (12% phosphorous) we get 450 - 500 VHN (approx. 45 ~ 50 HRC). Then we heat treat them in a Hot Air Oven, for 2 Hours at 300±20°C', after natural cooling, we get the hardness above 800 VHN (about 80 HRC). This might be helpful to you.(one theory says ENP coats can be heat treated only up to 400 °C)

Did you mean "stainless" as "stainless steel" ?
Why at all you go for electroless Nickel over Stainless Steel?

regards

Keshava Prasad M
- Chennai, India


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