Stainless steel is a common material for making all kinds of pipes. Thick-walled stainless steel unthreaded pipes, also known as Schedule 80 stainless steel pipes, provide super strong connections. They can be welded to obtain extra length, and welded connections are said to be stronger than threaded connections. Because they are less likely to leak. These sch 80 stainless steel pipes are seamless, smooth inside, and unrestricted flow. They have the strength to resist corrosion and withstand high pressure. They are used to transmit air, water, oil, natural gas, and hydraulics.