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Hebei energy Metal bellows concept The metal corrugated pipe, also known as corrugated Guanhan, refers to a threaded corrugated pipe for culverts buried under highways and railways. It is a circular corrugated pipe made of a waveform metal plate or made of a semi-circular waveform steel sheet. It is widely used in culverts such as highways, railways, small bridges, passages, retaining walls, and various mine roadway retaining walls. The metal corrugated pipe, also known as corrugated Guanhan, refers to a threaded corrugated pipe for culverts buried under highways and railways. It is a circular corrugated pipe made of a waveform metal plate or made of a semi-circular waveform steel sheet. Widely used in highways, railways, small bridges, passages, retaining walls, and various mine roadway retaining walls in the culvert(pipe).