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The purpose of pickling carbon steel pipe is to chemically remove the oxides, rust and oil from the inner surface of the pipe and vessel to obtain the glossy metal surface, to ensure the cleanliness of the inner wall of the pipe, and to prevent rust after pickling But also makes the bottom of the pipe wall metal to be protected to prevent further corrosion, pipeline acid pickling is a key hyperlink in the construction of the pipeline. With the dissolution of iron, the relative improve in the carbon content material of steel pipe, steel pipe brittle; response of hy