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Coating on Stainless Steel SA564 Gr.630 Steel Bars 2

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Charles Gomez

Industrial
Joined
Oct 9, 2019
Messages
1
Location
SG
Hello,

I run a bolts and nuts business in Singapore and recently received a rather interesting enquiry for SA564 Gr.630 Studbolt which require Ceramic Base Coating + PTFE Top Coat (Xylar 2 + Xylan) and Zinc Nickle Plating Base Coat + PTFE Top Coat (Xylan 1070 Blue). Taking into consideration that the bar is of Gr.630, can anyone assist to explain the need for the base coat Xylar2 / Zinc Ncikle as the steel bar material has strong corrosion resistance characteristics.

Kind regards,

CHARLES GOMEZ
 
It's a standard offshore fastener protection system. The Grade 630 may be classed as a stainless steel, but its marine atmospheric corrosion resistance is not that great, and wouldn't be classed as "strong."

Steve Jones
Corrosion Management Consultant


All answers are personal opinions only and are in no way connected with any employer.
 
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