I would tentatively suggest clean smelting 18:55 Feb 12
Metallurgy, either black or white, just isn't good. In English, the term simply isn't used in lay speak, period. While engineering texts and such may use this word, the more common name for the process and the industry as a whole is steelmaking. "Black" steelmaking makes as little sense as "white" steelmaking. The term clean smelting seems to be often enough used in your particular sense, but here's another problem: they usually smelt gold, copper and other non-ferrous metals rather than steel and iron. So clean smelting at a pipe making plant isn't exactly kosher either. This is a tough one, no doubt, and if my personal experience (and I do have some) with making steel tubulars is any indication, there is nothing, but nothing clean about it. | 
The translation workplace 
