ASTM A-588 Gr. A/B Corten steel plate offers all the advantages of ASTM A572-50 but is produced with elevated levels of copper to add corrosion resistance. This weathering grade provides atmospheric corrosion resistance and ultimately longer life in applications where exposure to elements will be a factor. is often used in unpainted applications such as bridges, utility sign/poles and highway structures and guardrails because of the self-repairing, natural oxide patina greatly reduces maintenance.
What sets Cor-ten apart from regular steel—and one of its biggest benefits in the garden—is that it becomes harder and stronger when exposed to weather over time.
“Cor-ten is the trade name of a material manufactured by US Steel. But, like Kleenex, the copyrighted name is now commonly invoked to refer to a whole category of products. In Cor-ten’s case, that’s any steel that develops a protective layer of rust when exposed to weather,” she says.
Frost- and crack-resistant, this metal will develop an attractive surface patina but will never rust through. We’ve rounded up 10 stylish hardscape and garden elements—from planters on wheels to metal frames for raised garden beds.