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Dub Annealed steel coils
Cold dov dub annealed coils (CRBA), tseem hu ua "Blue Steel".CRBA yog ibtxias dov steel coilsuas tau oxidized los ntawm annealing nyob rau hauv ib tug tshwj xeeb installation nyob rau hauv thiaj li yuav tsim ib tug nyias magnetite txheej (Fe304) rau saum npoo (tsawg dua 1 μm tuab) rau kev tiv thaiv ntau.