A wide range of materials is used for the manufacture of our pipeline products.
In such cases, can I rewirte to avoid confusion as follows?:
Materials in a wide range are used for the manufacture of our pipeline products.
You could, but I think this sounds somewhat forced, not like the most natural language. I don't think there will be any confusion if you write the sentence as it is, using "is" as the verb. This really only becomes a problem in discussions where people want to point out what is technically, or grammatically, correct.