Carbon Steel Pipe Fittings Elbow could be a most common sort of CS fitting utilized to connect pipe or tubing to permit a alter of direction, more often than not a 90° or 45° angle, though Elbow Carbon Steel is additionally utilized in a piping framework. Carbon Steel Elbows closes may be machined for butt welding, threaded, or socketed, so the elbows are comprise of butt weld, thread elbow, attachment elbow, and other arrangement.