High-pressure alloy steel pipe type can be classified according to its forming technology, construction data and style parameters are not the same. 1, According to forming technology classification ⑴ Hydraulic forming  High-pressure alloy steel pipe hydraulic forming is the most commonly used high-pressure alloy forming method. Using the liquid pressure in the tube, the tube is stretched in the retaining ring until it is exposed along the ring, and then the tube is compressed to the desired length. Small diameter high pressure alloy tube and more suitable for the use of this method. ⑵ Roll forming  High-pressure alloy steel pipe roll forming technology is mainly used for processing large-scale high-pressure alloy pipe, is dependent on the tube in the forming round of the roll forming, to single-wave rolling forming, and some equipment can also be a number A ripple. ⑶ Mechanical bulging  High-pressure alloy steel pipe that is appropriate to use in the tube in the expansion of the tire mold, one by one to expand into a ripple, after the beginning of the forming, and then refined in the outside Kun. ⑷ Welding  High-pressure alloy steel pipe on the wave height is too large or particularly high-pressure alloy tube, and more suitable for the use of stamping and welding technology. When the wave height exceeds the limit, the data elongation is not allowed to be suitable for the use of collective forming technology, or because of chaotic waveforms, the collective formation is very difficult and more suitable for the use of welding forming. This type of high-pressure alloy tube can not be used as an internal pressure, not suitable for use as an expansion section of the flexible section. ⑸ Silt forming  High-pressure alloy steel pipe is the use of electro-deposition method will be high-pressure alloy pipe material deposition to the core mold, and then die. This high-pressure alloy pipe material is a very soft pure nickel metal material, and is non-porous, because of this, in order to high vacuum, and the implementation of welding.

Alloy steel pipe will rust in use and improper maintenance, here to analyze what the case of alloy steel pipe is easier to rust. 1, When the alloy steel pipe in other metals when the chance of rust will be relatively large. Rare rust caused by dissimilar metals attached to the alloy steel pipe is generally not very serious, you can use a sponge or cloth, the neutral detergent or soapy water, etc. can easily remove the rust on the alloy steel pipe. 2, When the exhaust more harmful substances, the alloy steel pipe is also easy to cause rust. Like the factory or the city streets more traffic in the air more harmful substances in the region, so the appearance of alloy steel pipe is easy to be contaminated, long-term in this case the alloy steel pipe may be a small rust point. If the alloy steel pipe pollution is relatively light, then you can follow the first point of the method of rust, you can clean, if it is more serious pollution, then you have to clean up a way. 3, The air is more salt in the case of more likely to cause the rust of the alloy steel pipe. In the coastal areas because the air in the salt more moisture is relatively large, and often by the sea breeze blowing, so the red rust is alloy steel pipe can not be avoided. But this kind of rust is also very good in accordance with the above method on it.

High-pressure alloy steel tube is a kind of pressure to the tube, its excellent performance to win the majority of users praise, then the high-pressure alloy tube in the end what purpose? High-pressure alloy steel tube used to make high pressure and above the pressure of the steam boiler pipe and other high-quality carbon structural steel, alloy structural steel and stainless steel heat-resistant steel seamless pipe, the boiler tube by the party at high temperature and high pressure work, High temperature flue gas and water vapor will occur under the action of oxidation and corrosion, so the requirements of steel pipe with high lasting strength, high oxidation resistance, and has good organizational stability. High pressure pipe in addition to ensuring the chemical composition and mechanical properties, the water pressure test to be done, to be flaring, flattening test. The steel pipe is delivered in heat treatment. In addition, the finished steel pipe microstructure, grain size, decarburization layer also has certain requirements. Geological drilling and oil drilling and control of seamless steel pipe; to explore the underground rock structure, groundwater, oil, natural gas and mineral resources, the use of drilling rig drilling. Oil and natural gas mining is more inseparable from drilling, geological drilling and control oil drilling with seamless steel pipe is the main equipment drilling, including the core of the outer tube, core tube, casing, drill pipe and so on. As the drilling pipe to deep into the depth of several kilometers to work, the working conditions are extremely complex, drill pipe to withstand pull, pressure, bending, torsion and uneven impact load and other stress.

As city gas source will soon by the artificial coal gas as the main to give priority to the direction of the development process of gas, many cities face gas source, pipeline network reconstruction and new pipeline network how to apply it.  Because natural gas artificial and gas composition is different, it does not contain heavy hydrocarbons and water, and at the same time due to the use of natural gas, pipeline pressure increase, many cities artificial coal gas pipe network shall not apply to the original natural gas.According to some urban gas source conversion, the main problems of switching from artificial gas to natural gas pipeline network are: 1, cast iron pipe interface leakage, this problem is transformed the possibility of the frequency of which is the most serious problem, most domestic city of shenyang, jinzhou, such as natural gas leakage accident has occurred, the main reason is that exist in the artificial coal gas, dust and water vapor hydrocarbon on the interface of the rubber ring, oil hemp has moist effect, rubber ring, oil flax be affected with damp be affected with damp and saturated inflation, increased the sealing of the interface, even if has a small leak point will be blocked.After the pipeline USES natural gas, the interface filler contracts and leaks. 2. Leakage of indoor galvanized pipe, since the thread filling is made of hemp white lacquer, after the transformation, the sealing performance is affected by the water loss caused by the white paint, resulting in leakage. 3 impurities float in the sky, and the pipe due to the original medium in pipeline as the artificial coal gas, in the artificial coal gas condensation water and oxygen, produce rust, and unavoidably have left mud during pipeline construction, under the action of condensed water and aromatic hydrocarbon, adhesion in the bottom of a tube, gradually become dry, converted the pipe rust, dirt over gas flow in pipe float in the sky, the dust and impurities may clog the downstream piping, and affect the valve, pressure regulator, compressor, failure, rust can also affect add smelly effect.

Different grades of steel, because the chemical composition of different steel, and the chemical composition is different, it also caused its different mechanical parameters. The yield strength, ultimate strength, elongation, cold bending, and weldability are very different, and different grades of steel are used in the form of materials, The location is also very much together. Steel according to chemical composition classification, divided into non-alloy steel, low alloy steel, alloy steel. Non-alloy steel by quality grade is divided into ordinary quality non-alloy steel (usually ordinary carbon or low carbon steel), high-quality non-alloy steel (usually high-quality carbon or medium carbon steel), special quality non-alloy steel Carbon steel or high carbon steel).