Fasteners seize because oxide (red rust corrosion) accumulates in the thread engagement between the stud and the nut. When this occurs, removing the fastener from assembly usually requires cutting, torching, or grinding. In addition to ballooning a facility’s bolting budget, these time consuming processes also present a series of complicated safety issues, especially if disassembly requires hot bolting or single stud replacement procedures in order to keep the facility from extended costly downtime. When corrosion compromises engagement in this way, a $10 fastener could end up costing as much as $1,000 dollars to remove, not counting the lost production from shutdown.
At Doxsteel Fasteners, we address these corrosion issues and prevent our carbon steel bolts from seizing for a minimum of five years by coating them with ASTM B994 Nickel-Cobalt electroplating. The toughness and corrosion resistance of Nickel-Cobalt, when combined with our controlled processes and Class 1 testing procedures, produces a fastener that performs far beyond the expectations of other bolting systems.
But even the most well-made bolts won’t be able to do their job without following recommended installation procedures. As part of our mission to produce bolts that are designed for the end user, we take efforts in production to provide consistent k-factor and give our customers a torquing table for maintenance teams to use as an installation guide in each and every box of Doxsteel Fasteners. Teaming with Whitmore and Jet-Lube, we have also published a whitepaper that studies k-factor and corrosion with and without lubrication that gives a guide to the end user to better calculate required torque value.
Painting After Assembly for Optimum Coating Performance
All platings contain micropores. After a period of time, these micropores will start to produce stains of red rust on exposed areas of the bolt. With the application of polyurethane or epoxy paint, a maintenance team can seal these micropores and add to the longevity of the coating system. If the bolts aren’t painted, red rust stains will surely accumulate on the surface, but the toughness of the ASTM B994 Nickel-Cobalt plating keeps the rust from affecting thread engagement, thereby protecting bolt performance from being compromised.
After any field test on fasteners, a maintenance team should always evaluate the thread engagement and the ease of dismantle. No matter what conditions the bolting is placed in, its ability to be dismantled without cutting, grinding, or torching is the most important factor in achieving operational safety and efficiency. Polyurethane and epoxy paint systems add an additional layer of protection to fasteners in service, working to cover up damage that may occur during assembly or abrasive blasting procedures. That is why, for optimal performance, we recommend that all Doxsteel Fasteners be painted after they have been installed.
The Longest-Lasting Bolt on the Market
From high temperature heat exchangers and sour water handling environments that are typical at downstream refineries to the salt spray and splash zone weather of the Gulf Coast, Doxsteel Fasteners go places that other coating systems can’t. With our recommendations for optimum performance, a facility using our ASTM B994 Nickel-Cobalt bolting has the solution that provides unparalleled corrosion protection for all operations.
To learn more about what we can do for your operations, contact Doxsteel today.