Anticorrosive treatment method for water steel pipe
First, the anti-corrosion process of water steel pipe
1. Cleaning and cleaning the surface of the steel with solvent and emulsion to remove oil, grease, dust, lubricant and similar organic matter, but it can not remove rust, scale, flux, etc. on the surface of the steel, so it is only used in anti-corrosion production. Auxiliary means. 2, tool rust mainly use steel wire brush and other tools to polish the surface of the steel, can remove loose or lifted scale, rust, welding slag and so on. The manual anti-corrosion steel pipe treatment method can reach Sa2 level and power.
With the continuous development of China's economy, the country vigorously develops the energy industry. Long-distance oil and gas pipelines are an important way of energy security. In the process of anti-corrosion construction of oil (gas) pipelines, the treatment method of anti-corrosion steel pipes is the key to determine the service life of pipelines. One of the factors is that it is a prerequisite for the firm combination of the anti-corrosion layer and the steel pipe.
Therefore, the requirements of the surface of the steel pipe should be strictly followed in accordance with the specifications of the anti-corrosion layer, and the treatment methods of the anti-corrosion steel pipe should be continuously improved.
1. Cleaning and cleaning the surface of the steel with solvent and emulsion to remove oil, grease, dust, lubricant and similar organic matter, but it can not remove rust, scale, flux, etc. on the surface of the steel, so it is only used in anti-corrosion production. Auxiliary means.
2, tool rust mainly use steel wire brush and other tools to polish the surface of the steel, can remove loose or lifted scale, rust, welding slag and so on.
The treatment method of spiral steel pipe manual anti-corrosion steel pipe can reach Sa2 level, and the descaling of power tools can reach Sa3 level. If the steel surface is adhered with strong iron oxide skin, the tool rust removal effect is not ideal, and the anchor depth required for anti-corrosion construction is not reached.
3, pickling is generally done by chemical and electrolytic two methods of pickling, pipeline anti-corrosion only chemical pickling, can remove oxide scale, rust, old coating, and sometimes can be used as sandblasting after rust removal.
Although chemical cleaning can achieve a certain degree of cleanliness and roughness, its anchor pattern is shallow and it is easy to cause environmental pollution.
4, spray (throwing) shot rust spray (throwing) shot rust removal is driven by high-power motor to spray (drow) the blade to rotate at high speed, so that the abrasive material such as steel sand, steel shot, wire segment, minerals, etc. under the action of centrifugal force The surface of the steel pipe is sprayed (throwing), and the treatment method of the anti-corrosion steel pipe can not only completely remove rust, oxide and dirt, but also the uniform roughness of the steel pipe under the action of abrasive impact and friction.
After spraying (polishing) and removing rust, not only can the physical adsorption of the surface of the tube be enlarged, but also the mechanical adhesion of the coating layer to the surface of the tube can be enhanced. Therefore, the treatment method of spiral steel pipe anti-corrosion steel pipe is an ideal derusting method for pipeline anti-corrosion.
Second, the performance of water spiral steel pipe
If the gap is too small, the proximity effect is increased, the welding heat is too large, and the weld is burnt; or the weld is pressed and rolled to form a deep pit, which affects the surface quality of the weld. After the two edges of the tube are heated to the soldering temperature, under the extrusion of the pressing roller, a common metal grain is formed to infiltrate and crystallize, thereby finally forming a firm weld. If the pressing force is too small, the amount of the common crystal is small, the strength of the weld metal is lowered, and cracking occurs after the force is applied; if the pressing force is too large, the molten state is caused.
The water spiral steel pipe is used to feed the strip steel into the welded pipe unit. After rolling through multiple rolls, the strip is gradually rolled up to form a circular tube blank with an open gap, and the reduction of the pressing roll is adjusted to control the weld gap. 1~3mm and make the solder joints flush at both ends.
If the gap is too large, the proximity effect is reduced, the eddy current heat is insufficient, and the weld intergranular joint is poor to cause unmelting or cracking.
If the gap is too small, the proximity effect is increased, the welding heat is too large, and the weld is burnt; or the weld is pressed and rolled to form a deep pit, which affects the surface quality of the weld.
After the two edges of the tube are heated to the soldering temperature, under the extrusion of the pressing roller, a common metal grain is formed to infiltrate and crystallize, thereby finally forming a firm weld.
If the pressing force of the spiral steel pipe is too small, the number of common crystals will be small, the strength of the weld metal will decrease, and cracking will occur after the force is applied; if the pressing force is too large, the molten metal will be extruded out of the weld. Not only the weld strength is reduced, but also a large number of internal and external burrs are generated, and even defects such as weld seams are caused.
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