What is black iron?0183;32;January 5, 2011. A. Hi, Rosalie. All three terms are slang rather than specifications, so the point may be moot anyway. But I think that I would use the term "mild steel" or "mild carbon steel" because the term "black iron" is actually inaccurate as Ron has mentioned, and some "carbon steel" is not mild whereas black iron pipe probably is mild.
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