spray and fused coating

[Arturas]

Hello,
I have question about two fused coatings NiCrBSi and NiCrBSi+WC. The fused part is roll which transport various shapes steel slabs , stick and ... . There are constant impact of them to coating, temperature of them 800-1100C, part become heated to 200C, steam of water at the same time. Which coating will be better and why I need answer if it is possible WHY?
Best regards
Arturas

[Gordon]

Hi Arturas

A fused NiCrBSi loaded with WC tungsten carbide certainly has the potential to significantly reduce abrasive wear. But, it is difficult to predict the effects of impact and corrosion/oxidation in your particular application. Hopefully, someone with first-hand experience can comment. I can only suggest you get your customer to trial run some rolls with the proviso that there is a potential for better life/performance with an unknown risk of premature failure compared to straight NiCrBSi coating. The only way really to know for sure is to try it.

[fhyuan]

The part are heated to 200C, but what is the temperature of the coating in contact with the slabs. If the coating is also 200C, then oxidation/corrosion would not be a problem. The influence of the impact and wear would be tested.