Ways And Means To Prevent Galvanized Pipe Pressure Groove Fracture

Hot-dip galvanized steel pipe is a kind of with hot-rolled or cold-rolled galvanized steel strip or galvanized coil as a billet by cold bending processing forming and then by high-frequency welding made of square cross-section shape dimensions of the hollow square cross-section steel pipe, or will be made beforehand cold-formed hollow steel pipe and then hot dip galvanized processing of galvanized square tube.

Hot-dip galvanized steel pipe from the production process is divided into hot hot-dip galvanized steel pipe and cold hot-dip galvanized steel pipe. It is because of the two kinds of hot-dip galvanized steel pipe processing is not the same also creates a lot of their different physical and chemical properties. In general, they have a lot of differences in strength, toughness and mechanical properties.

Hot hot-dip galvanized steel pipe:It is a square pipe made by welding after using steel plate or steel strip coiled and formed, and on the basis of this square pipe, the square pipe is placed in a hot-dip galvanized pool after a series of chemical reactions and then formed a kind of square pipe. Hot-dip galvanized steel pipe production process is relatively simple, and production efficiency is very high, the variety of specifications are also many, this kind of square pipe requires very little equipment and capital, suitable for small hot-dip galvanized steel pipe manufacturers. But from the strength of this steel pipe is much lower than the seamless square pipe.

Cold hot-dip galvanized steel pipe is the use of cold galvanizing on the square pipe used to make the square pipe have anti-corrosion properties. Unlike hot-dip galvanizing cold galvanizing paint is mainly through the electrochemical principle of corrosion protection, so it is necessary to ensure that the zinc powder and steel full contact, resulting in an electrode potential difference, so the surface treatment of steel is very important.

Galvanized its protective effect is stronger, strong corrosion resistance. The whole structure by zinc, the formation of dense quaternary crystals, this crystal in the steel plate to form a layer of barrier, thus effectively preventing the penetration of corrosion factors. Corrosion resistance comes from the strong protective function of the barrier layer of zinc. When zinc in the cut edge, scratches and plating abrasion part of the sacrificial protection, zinc will form an insoluble oxide layer, play a barrier protection function.

Before galvanized pipe grooving, adjust the axis of steel pipe and grooving equipment, and require the steel pipe and grooving equipment level.

Adjust the speed of grooving, grooving molding time should not exceed the specified, uniform, slow application of force.

Grind the welding rib on the inner wall of the grooving part of the steel pipe nozzle to reduce the resistance of grooving.

Adjust the axis of steel pipe and grooving equipment, and require the steel pipe to be level with the grooving equipment.

Adjust the grooving speed, the grooving speed should not exceed the specified, even and slow application of force.

Check the width and type of the support roller and pressure roller of the grooving equipment, whether there is a mismatch between the size of the two rollers and the phenomenon of occlusion.

Use vernier calipers to check whether the groove of the steel pipe is specified.

The surface of the pipe end to the groove section should be flat without bumps and roll marks.

The center of the groove circle should be concentric with the pipe wall, and the width and depth of the groove should be in accordance with the requirements, and check whether the clamp parts are of the correct type.

Apply lubricant on the rubber sealing ring and check whether there is any damage to the rubber sealing ring, and the lubricant shall not be oil lubricant.

Galvanized steel pipe nozzle butt joints are not in a straight line and the existence of steel pipe beveling problem, it is recommended to cut off a small section of the steel pipe head before processing. In this way, a greater degree of prevention of galvanized pipe pressure groove fracture