Carbon steel elbow is a kind of prefabricated directly buried carbon steel elbow made of high-density polyethylene outer protective pipe polyurethane foam plastic, which is closely combined with the elbow of transmission medium, high-density polyethylene outer sleeve and the polyurethane hard foam carbon steel layer filled between the elbow and the outer sleeve. It is only necessary to cover the elbow after rust removal and anti-corrosion in the polyethylene sleeve, and inject polyurethane foam in the middle to fully fill the gap between the elbow and the polyethylene sleeve, In the later stage, the elbow, sleeve and carbon steel layer will form a solid whole to achieve the effect of anti-corrosion carbon steel, and then the carbon steel elbow will be formed.
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