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Galvanized steel pipes are divided into cold-galvanized steel pipes and hot-dip galvanized steel pipes. Hot-dip galvanized steel pipes are widely used in fire protection, electric power, highways and other fields.

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Rectangular tubes are generally unpacked, flattened, crimped and welded to form round tubes, which are then rolled into square tubes and then cut into required lengths.

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Welded steel pipe refers to a steel pipe that is bent and deformed into a round, square, etc. shape with a steel strip or steel plate and then welded into a jointed surface.

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Spiral steel pipe is a spiral seam steel pipe made of strip steel coil as raw material, extruded at regular temperature, and welded by automatic double-wire double-sided submerged arc welding process.

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The seamless steel pipe is made by perforating the whole round steel, and the steel pipe without weld seam on the surface is called seamless steel pipe.

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