corrosion resisting; high pressure resistant; Steel elbow from material points include: carbon steel, alloy steel, stainless steel, cast steel, copper ... , aluminum. From the production process points include: stamping, push system, butt, forging. From the specification ... 2 D, 2.5 D, 3 D. From use kinds points include: high elbow, low bend, thick wall elbow, butt welding ...