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Old 08-08-2022, 11:33 AM
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Join Date: Jun 2004
Location: Kankakee County, IL
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Originally Posted by JBFab View Post
Alright, Corten is a brand name for ASTM A588 Weathering steel. A588 is indeed an HSLA grade, but not all HSLA is A588 (or weathering steel for that matter). A588 surface rusts very quickly, but that rust sort of encapsulates the steel beneath it slowing down further rusting. You won't see sheets of rust flaking off of A588. It's commonly used on RR bridges, not just because of the added yield strength over conventional A992, but because they don't have to paint it. Also, if you're going to use A588 for it's weathering properties, you ought to use the welding consumables to weld it as well.
Otherwise you're defeating the purpose. Another misconception out there is that HSLA (including A588) is produced to pass yield/tensile test and NOT to a specific chemistry. That is false - they must pass both.
It still rusts through.

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