What are air compressor tanks made of? Support December 05, 2022 18:13 Updated Air compressor tanks are made of steel. Related articles What causes swirl marks? Is there a wait time between shots? Can I put a 1/2" chuck on a 3/8" drill? How can I get parts and service for my Porter Cable product outside North America? What is the process for sending an invention or idea to someone for consideration? Comments 0 comments Please sign in to leave a comment.