What Is Galvanized Steel Pipe?

Galvanized steel pipes are divided into cold-galvanized steel pipes and hot-galvanized steel pipes. Cold-galvanized steel pipes have been banned, and the latter has been advocated for temporary use by the state. In the 1960s and 1970s, developed countries in the world began to develop new types of pipes and banned galvanized pipes one after another. China's Ministry of Construction and other four ministries and commissions have also issued documents expressly banning galvanized pipes as water supply pipes from 2000. Galvanized pipes have been rarely used for cold water pipes in new communities, and galvanized pipes are used for hot water pipes in some communities. Hot-dip galvanized steel pipe has a wide range of applications in fire protection, power and highways.

Galvanized steel

1. First, the surface of the steel is cleaned with a solvent to remove organic matter on the surface.

2. Then use tools to remove rust (wire brush) to remove loose or inclined scale, rust, welding slag, etc.

3. Use pickling.

Galvanizing is divided into hot plating and cold plating. Hot plating is not easy to rust, and cold plating is easier to rust.

Galvanized steel pipe connection method: thread, welding.

Galvanized steel pipe rolling groove connection

(I) Cracking of the rolling groove 1. Polish the welding ribs on the inner wall of the pipe groove to reduce the rolling groove resistance.
2. Adjust the axis of steel pipe and rolling groove equipment, and require the level of steel pipe and rolling groove equipment.
3. Adjust the speed of the groove pressing, and the forming time of the groove can not exceed the requirements, and the force should be applied evenly and slowly.
(II) Fracture of rolled groove steel pipe 1. Grind the welding ribs on the inner wall of the pipe groove of the steel pipe to reduce the rolling groove resistance.
2. To adjust the axis of steel pipe and rolling groove equipment, the level of steel pipe and rolling groove equipment is required.
3. Adjust the groove pressing speed. The groove pressing speed should not exceed the requirements, and the force should be applied evenly and slowly.
4. Check the width and model of the support roller and pressure roller of the roll groove equipment, if there is any mismatch in the size of the two rollers, which will cause the bite phenomenon.
5. Use a vernier caliper to check whether the groove of the steel pipe is specified.
(3) The grooves formed by the rolling groove rolling machine shall meet the following requirements: 1. The surface from the pipe end to the groove section shall be flat, free of unevenness and no rolling marks.
2. The center of the groove should be concentric with the pipe wall, the width and depth of the groove should meet the requirements, and check whether the model of the clamp is correct.
3. Apply lubricant to the rubber seal ring and check whether the rubber seal ring is damaged. The lubricant must not be oil lubricant.

Galvanized steel pipe welded connection

1. The problem of galvanized steel pipe pipe butt joints is not in a straight line and the steel pipe has an oblique mouth. It is recommended that the steel pipe pipe head be cut off for a short period before processing.
2. The galvanized steel pipe joints are not tight after the joints of the two pipes, resulting in uneven thickness of the weld joints; and the pipe is oval due to its own reasons or transportation bumps. Processing.
3. After the butt joint of galvanized steel pipe, trachoma appears in the pipe mouth:
4, due to technical reasons during welding.
5. There is a zinc tumor at the nozzle, which causes welding difficulties and trachoma problems. The zinc tumor is too large and too many tubes to be simply removed.

Galvanized steel pipe wire connection

1. Untidy buckle: The pipe clamp and the buckle cannot be completely contacted and loosened. Cut off the untidy buckle and re-install the wire.
2. The steel pipe wire buckle does not match the pipe wire buckle and cannot be connected. The pipe wire should be replaced or the equipment should be re-wired.
3. Missing print after steel pipe wire: measuring whether the wall thickness of the steel pipe can meet the standard thickness requirements of the wire pipe