Coating on Stainless Steel SA564 Gr.630 Steel Bars 2

Charles Gomez · Oct 9, 2019

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

SJones · Oct 10, 2019

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

http://www.linkedin.com/in/drstevejones

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

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Coating on Stainless Steel SA564 Gr.630 Steel Bars 2

Charles Gomez

Industrial

SJones

Petroleum

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