LSAW Steel Pipe

 Seamless pipes are made of steel ingots or solid pipe blanks through perforation into capillary pipes, which are then hot-rolled, cold-rolled or cold-drawn. It occupies an important position in my country's steel pipe industry. So what should be paid attention to when producing seamless pipes? 1) Pay attention to whether the thickness of the embryo pipe wall is uniform. If it is found that the wall thickness of the embryo pipe is uneven, the surface polishing treatment must be carried out. In addition, pay attention to whether the inside and outside of the embryo tube are flat and there are no bumps and defects. Once the bumps or defects are found, they should be dealt with in time. 2) The re-inspection of the embryo pipe. The main work of the re-inspection is to ensure that there are no cracks and defects on the outside of the capillary pipe, check these problems in the capillary pipe and make corresponding elimination instructions, and be sure to remove the pockmarked surface an...

 Emission reduction technology for VOCs in the sintering process of the steel industry. The measures taken by the domestic and international steel industry to reduce the emission of VOCs in the sintering process can be divided into three categories: source reduction, process control and end treatment. Source cuts. In terms of source reduction, since most of the petroleum hydrocarbons volatilize in the sintering mixture at 100 ° C to 800 ° C and are discharged from the sintering process by the exhaust gas, reducing the use of oily dust and rolling chips can reduce VOCs emissions. The main techniques include: separately selecting low oil content dust and rolling mill to limit oil input; reducing the oil content of the rolling mill; purifying the rolling mill, heating the rolling mill to 800 ° C, volatilizing petroleum hydrocarbons; using solvent to roll from Extract oil from the chips. Process control. In terms of process control, a part of the hot exhaust gas (ie, the flue gas of th...

 High-strength low-alloy steel can be used for both skyscrapers and long-span bridges, as well as for line pipes, very large vessels, and near-shore pressure vessels. However, in order to manufacture these devices, the low alloy steel used is required to satisfy both high strength and impact toughness as well as good weldability. With TMCP, boron can be used to replace carbon and other alloying elements to enhance strength, even if a small amount of boron (below 100 ppm) can affect the microstructure and mechanical properties of steel. Due to the development of trace boron control and detection technology, the addition of boron to steel has begun to receive attention. Boron can enhance the hardenability of steel by grain boundary segregation, and can also precipitate at grain boundaries or affect the precipitation rate of carbides and other precipitates. Experiments have shown that the segregation of boron is initially increased and then decreases as the heat input increases. It is...

 The main heat source uses a high-output semiconductor laser oscillator to control the shape of the laser beam to adapt to the shape of a large rectangular groove, and combines the hot wire method with practical effects in reducing heat energy and improving efficiency to perform a new single-weld vertical welding. Process. The welded portion is surrounded by the same copper plate as the gas shielded arc welding, and the wall of the groove is melted by the laser light reflected on the surface of the molten pool formed by the hot wire method with a large rectangular welded spot suitable for the shape of the groove. The welding process achieves high-quality and high-efficiency welding construction due to low heat energy, low dilution rate, low deformation, etc., and the cost is reduced by reducing the laser power. In addition, it is expected to increase the flexibility of construction in response to changes in the width of the groove. Use a dedicated wire heating power source to heat ...

 How to reduce the wear of ERW welded pipes in production and ensure the quality of welded pipes? From the analysis data of ERW welded pipe scrap, it can be seen that the roll adjustment process plays a very important role in the production of welded pipes. That is to say, in the production process, if the rolls are damaged or severely worn, part of the rolls should be replaced in time in the unit, or a certain type of welded pipe should be continuously and fully produced, and the entire set of rolls should be replaced. When replacing the welded steel pipe, it is necessary to adjust the rollers accordingly to ensure the quality of the welded pipe. On the contrary, if the rolls are not adjusted properly, it is likely to cause defects such as twisting, lap welding, edge fluctuations, indentations, scratches and even large ovality on the surface of the welded pipe and the pipe body. The following introduces the operation method of adjusting the roll that should be mastered when changi...

 Nowadays, the surface of the welded tubes we use are required to be coated for corrosion protection. The common anticorrosion coatings for welded tubes are petroleum asphalt, epoxy coal tar asphalt, PE sheath and PE foam sheath, epoxy powder, coal tar enamel and three-layer composite structure. The more used pipe anti-corrosion methods are 3PE composite structure and single-layer powder epoxy resin. So do you know how the welded tube is anti-corrosion? 1)Coating anti-corrosion Coating anti-corrosion refers to the uniform, dense coating on the surface of the rusted metal tube to isolate it from various corrosive media. This method of corrosion protection is usually used for steel tubes. Coating anti-corrosion materials are brushed coatings, which are paints, but with special properties that act as isolators. These materials and structures have better dielectric properties, physical properties, chemical properties and temperature range. 2) Cold-wrap tape Cold-wrap tape has the advan...

 Analytical technology was first developed as a simple material evaluation technology, and now it has become a supporting technology for material development. The analysis results provide important information for the development of high-performance surfaces and interface materials. In order to meet the user's requirements for steel materials such as corrosion resistance, first-class steel mills have vigorously developed surface treatment technologies and film forming technologies for steel materials. The microscopic conditions of the surface, film and grain boundaries of steel materials use advanced electron microscopy and surface analysis techniques. Increasing analytical techniques provide strong support for the development of steel at a higher level. In the research of galvanized steel sheet structure, surface analysis techniques such as scanning electron microscopy (SEM) and glow discharge spectroscopy (GDOES) have been used to perform elemental analysis in the depth direction...