Seamless Steel Pipe

    Oil casing drilling is also called percussion drilling. The steel wire rope is used to send the drill bit to the bottom of the well, and the beam mechanism is driven by the driving force to make one end of the beam move up and down, and the steel wire rope and the drill bit are impacted up and down, so that the rock is broken. The drilling speed of the Dayton drill is generally relatively slow, and the efficiency is very low, which can not adapt to the increasing depth of the well and the complicated formation drilling requirements, so it has been gradually replaced by rotary drilling. However, its equipment is relatively simple, its cost is low, and it will not pollute the oil layer. It can be used in some shallow low-pressure oil and gas wells and lost wells. Downhole power drilling is the use of downhole power drilling tools to drive the drill bit to break the rock. The drill string does not rotate during drilling, its wear is relatively small, and the service life is l...

    In daily life, many water pipes are used. Spiral steel pipe is one of them. When the pipe is blocked, it will not only affect our use, but also corrode some of the raw materials inside the pipe. Therefore, if the dredge is not carried out in time, it will have an adverse effect after a long time. What should I do when the spiral steel pipe is blocked?     1. Flush with water. The pressure of water is used to wash away all the blocked substances. This method is very simple, but when there are too many blocks, it will have no effect.     2. Flush with machinery. Use mechanical equipment to send high-pressure jets to flush the pipeline and loosen the sediment in the upstream pipeline, so that the dirt can be washed away.     3. Manual processing. Use corresponding tools to remove the obstruction.     Generally speaking, these three methods are used in combination, which will be more useful to help us organize and unblock.

    Advantages of pipeline magnetic flux leakage detection     Magnetic flux leakage detection uses magnetic sensors to detect defects. Compared with penetration and magnetic powder methods, it has the following advantages:     1) Easy to automate. The signal is received by the sensor, and the software determines whether there is a defect, which is suitable for forming an automatic detection system.     2) High reliability. From sensors to computer processing, the errors caused by human factors are reduced, and the detection reliability is high.     3) The initial quantification of defects can be achieved. This quantization can not only realize the existence of defects, but also make a preliminary assessment of the degree of defects.     4) For pipes with a wall thickness of less than 30mm, both inner and outer wall defects can be detected at the same time.     5) Because it is easy to automate, it can ob...

    What are the factors affecting the performance of galvanized steel pipes?     1. Carbon: The higher the carbon content, the higher the hardness, but the worse its plasticity and toughness.     2. Sulfur: It is harmful debris in steel. Steel with high sulfur content is easy to be brittle when it is processed at high temperature under pressure. It is usually called hot brittleness.     3. Phosphorus: It can significantly reduce the plasticity and toughness of steel, especially at low temperatures. This phenomenon is called cold brittleness. In high-quality steel, sulfur and phosphorus must be strictly controlled. But on the other hand, the low-carbon steel contains high sulfur and phosphorus, which can make it easy to cut, which is beneficial to improve the machinability of the steel.     4. Manganese: can improve the strength of steel, weaken and eliminate the adverse effects of sulfur, and can improve the hardenability of ste...

    1. Small tubes avoid large tubes:     Small tubes are easy to bend and low in cost.     2. The branch pipe avoids the main pipe:     The branch pipe generally has a smaller pipe diameter, and the influence scope and importance of the branch pipe are less than the main pipe.     3. Pressured tubes avoid pressureless tubes (pressure flow tubes avoid gravity flow tubes):     The gradient and flow direction of pressureless tubes (gravity flow tubes) change, which has a greater impact on the flow.     4. The water supply pipe avoids the drain pipe:     In addition to the reason mentioned above, the drain pipe usually has a large diameter and many impurities in the water.     5. Normal temperature pipes avoid high (low) temperature pipes (cold water pipes avoid hot water pipes, non-insulated pipes avoid heat insulation pipes):     The temperature of the pipe is higher than...

    Hot rolling is relative to cold rolling. Cold rolling is rolling performed below the recrystallization temperature, and hot rolling is rolling performed above the recrystallization temperature.     Advantages     It can destroy the casting structure of steel ingots, refine the grains of steel, and eliminate the defects of micro-structure, so that the steel structure is dense and the mechanical properties are improved. This improvement is mainly reflected in the rolling direction, so that the steel is no longer an isotropic body to a certain extent; bubbles, cracks and looseness formed during casting can also be welded under the action of high temperature and pressure.     Disadvantages     1. After hot rolling, the non-metallic inclusions (mainly sulfides and oxides, and silicates) in the steel are pressed into thin slices, and delamination (interlayer) occurs. Delamination greatly deteriorates the tensile properties of the s...

    For stainless steel seamless pipes, the three elements of solution treatment are temperature, holding time and cooling rate. What is the effect of solution treatment of stainless steel seamless pipe ?     1. Make the structure and composition of stainless steel seamless pipe uniform, which is especially important for raw materials, because the rolling temperature and cooling speed of each section of hot-rolled pipe are different, resulting in inconsistent structure. At high temperatures, atomic activity intensifies, the σ phase dissolves, the chemical composition tends to be uniform, and a uniform single-phase structure is obtained after rapid cooling.     2. Eliminate work hardening to facilitate continued cold processing. Through the solution treatment, the twisted crystal lattice is restored, the elongated and broken grains are recrystallized, the internal stress is eliminated, the tensile strength of the steel wire is reduced, and the elongation...

    Hot rolling and cold rolling are forming steel or steel plates, and they have a great influence on the structure and properties of steel. The rolling of steel is mainly hot rolling, and cold rolling is only used for the production of small section steel and sheet.     The main difference between hot rolled and cold rolled seamless steel tubes:     1. Cold-rolled formed steel allows local buckling of the section, so that the bearing capacity of the member after buckling can be fully utilized;hot-rolled steel does not allow local buckling of the section.     2. The causes of residual stress in hot-rolled steel and cold-rolled steel are different,so the distribution on the cross section is also very different. The residual stress distribution on the cross section of cold-formed thin-walled steel is curved, while the residual stress distribution on the section of hot-rolled or welded steel is thin film.     3. The torsional stiff...

　　Hot-rolled seamless pipe is relative to cold-rolled seamless pipe. Cold-rolled seamless pipe is rolled below the recrystallization temperature, and hot-rolled seamless pipe is rolled above the recrystallization temperature. 　　Advantages: It can destroy the casting structure of the steel ingot, refine the grains of the steel, and eliminate the defects of the microstructure, thereby making the steel structure dense and improving the mechanical properties. This improvement is mainly reflected in the rolling direction, so that the steel is no longer an isotropic body to a certain extent. Bubbles, cracks and looseness formed during casting can also be welded under high temperature and pressure. 　　Disadvantages: 　　1. After hot rolling, non-metallic inclusions (mainly sulfides and oxides, as well as silicates) inside the steel are pressed into flakes, and delamination (interlayer) occurs. Delamination greatly deteriorates the tensile properties of the steel in the thickness d...

　　It is a spiral seam steel pipe with strip coil as the raw material, often warm-extruded, and welded by automatic double-wire double-sided submerged arc welding. 　　The characteristics of spiral submerged arc welded pipe : straight seam welded pipe has simple production process, high production efficiency, low cost and rapid development. The strength of spiral welded pipes is generally higher than that of straight seam welded pipes. Welded pipes with larger diameters can be produced from narrower billets. Welded pipes with different diameters can also be produced with billets of the same width. Therefore, most of the smaller-diameter welded pipes are straight seam welded, and large-diameter welded pipes are mostly spiral welded.