Problems with surface treatment of bolts and nuts
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The equipment in question features stainless steel pipes, and the customer requires nuts of type A193 Gr B7 and bolts of type A194 Gr 2H. What surface treatment is generally suitable for such fasteners? Nickel plating or hot-dip galvanizing? We usually use hot-dip galvanizing; I’m not sure if that’s a problem
No surface treatment is needed; if exposed to high temperatures, problems will arise after galvanizing
I asked the materials engineer about galvanizing bolts; generally, galvanizing is not done unless there are special requirements. ASTM A193 states that galvanized bolts should not be used in environments above 210°C
Galvanized bolts cannot be used in high temperatures; it was already mentioned on the 8th floor
Generally rust-resistant at room temperature, galvanized. For corrosion resistance, nickel plating is used; for resistance to hydrogen sulfide corrosion, PTFE is used. The costs, from low to high.