Recently, one client asked whether a 2B stainless steel surface finish, as specified in ASTM A480, is better than or equal to an electropolished or passivated finish. The answer is that, in most cases, electropolished finishes are superior to the more common 2B finish in terms of performance for stainless steel.
2B is the term used by the ASTM A480 standard to define “a smooth, moderately reflective cold-rolled annealed and pickled or descaled finish typically produced by imparting a final light cold-rolled pass using polished rolls.”
It is the most widely-used stainless steel finish available today. In fact, most of Marlin’s steel wire supply is 2B finish by default.
Some key considerations for this finish include:
In many applications, 2B stainless steel surface finishes are perfectly suitable for the task at hand. However, they are often not as effective as electropolished finishes are for mechanical performance.
While having stainless steel electropolished might be costlier than using the “default” 2B finish produced by most mills, it is often well worth the added cost.
The benefits of electropolishing over using the standard 2B finish include:
Overall, electropolishing produces a smoother, stronger, and more attractive wire form than the standard 2B finish.
When choosing a surface finish for your custom wire forms, it’s important to balance their performance needs thoroughly. This is one reason why Marlin Steel tests every wire basket and tray design used advanced physics simulation software. By testing designs against the projected stresses of the application they’ll be used for, it’s possible to spot performance issues that may otherwise have been forgotten.
So, be sure to consult with an experienced mechanical engineer before settling on a surface finish or coating, just in case.
Electropolished Wire Mesh Basket with Handles
Finishing Your Steel: Electropolishing vs. Passivating Stainless Steel
The Fundamentals of Nitric Acid Passivation, Pickling and Electropolishing
When is Sanding Preferable to Electropolishing?