Elbow is changing the direction of pipeline fittings. Press point, 45 and 90 180 the three most commonly used, according to the project needs to include other irregular angles, 60 elbow. Bend materials cast iron, stainless steel, alloy steels, malleable cast iron, carbon steel, non-ferrous metals and plastics. And the pipe connections are: direct soldering (the most common way) flanged connections, hot-melt, fused connection, threaded and socket connections and so on. According to the production process can be divided into: welding stamping elbows, elbows, pushing elbows, casting such as elbows, butt welding elbows. Other names: 90 degree bent elbow, right angle bend, love and so on. www.sellsteels.com/steel-fitting/elbow.html