MS Pipe refers to Mild Steel Pipe.
Mild Steel (MS) pipes are manufactured using low carbon (less than 0.25%) steel. Mild Steel pipes or tubes have high tensile strength with low percentage of carbon and can be welded and fabricated easily with long life as well as not too costly in comparison to other metals for pipelining and tubing purposes. These are generally used for drinking water supply i.e. Plumbing, Firefighting, HVAC but can also be used in various other Industrial and Engineering applications. These pipes are usually coated with other metals/paints/varnish etc to prevent it from rusting but extra care should be taken to prevent it under extreme conditions.