90-degree straight seam elbow is a kind of pipe fitting used in pipeline turning, which occupies a large proportion in the use of pipe fittings. Because of its different manufacturing methods, it can be divided into extruded large-diameter seamless straight-seam elbow and cold-drawn large-diameter seamless straight-seam elbow. There are two kinds of cold-drawn large-diameter seamless straight-seam elbows: round pipe and special-shaped pipe.
High-precision and long-life mold vibration device is one of the key technologies of continuous casting, including the optimization of hardware of vibration device and software of mold vibration form and vibration process parameters.