What is the difference between black steel pipes and galvanized steel pipes when used for water or gas, and why?
Just because two things are painted red doesn't mean that they're the same. You need to know what type of iron (if it really is iron, but doubtful) your black iron pipe is made from. Sometimes standard pipe used in commercial applications for plumbing is called black pipe by the contractors. This type of black pipe is usually A53. Pipes can come in many types of grades of steel. Is the pipe A500, A53, A106, etc? Each grade has slightly different chemical compositions that give the steel different mechanical characteristics. Also, pipe can come in different schedules (wall thicknesses) which does not change the outside diameter of the pipe. With an increase in wall thickness a pipe will become more rigid.
Black Steel or ductile steel pipes are made from scrap for the most part. Galvanized pipes are made from new raw materials and are electroplated to resist rust.
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