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Black steel purlins

I have come across the term "Black Steel" purlins often, and want to compare it against Galvanised purlins, and mild steel purlins. However I am not sure whether "Black steel" refers to a metal coating, base metal or whether it is simply a trade mark. Any ideas?

Ruchira Chandrasekera
Roofing manufacturer - Kaduwela, Colombo, Sri Lanka
2004

What I've found with a web search are two common materials. One, coated steel, and two, a brand name of fibreglass+graphite fishing rod. I would assume you're dealing with an anodized or painted product.

Luke Matthews
Signs, graphic design - Monterey Park, California, USA
2004

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