SSAW Pipe

　　Q345B seamless steel pipe is used in various aspects due to its superior performance. And because it has greater practicability and adaptability, it has naturally become a priority in various fields. 　　When the internal quality of Q345B seamless steel pipe is inspected, it can be irradiated by ultrasonic or radiation, and the outer surface of the weld can be magnetic powder or penetrant flaw detection, and the magnetic powder or penetrant flaw detection should be carried out after the post-weld insulation is completely cooled. Regardless of the method used for testing, it must comply with the requirements of the relevant normative standards. As a metal material, it also has its own drawbacks, such as the occurrence of rust. 　　After rusting, it will affect the use of steel pipes and pipe fittings more or less, so we can always maintain a good use effect. We naturally need to know how to deal with its rust. When its rust is not very serious, we can try to remove rust by some means....

　　Rare crack morphology exist: crack parts of the tube on the surface, the appearance of cracks is one of the rare defects in the tube production in the S355. Dendritic, intermittent appearance oxidation. Further microscopic cracks within the iron oxide, black or dark gray. 　　Analysis: the main reason of crack for the smelting, such as the inclusion aggregation, composition segregation, casting exception. Casting billet appearance of oscillation marks at the crack and corner crack is the main reason for the appearance of cracks in tube; In addition, the peritectic solidification of the molten steel will result in uneven solidified shell and copper wall contact heat transfer mitigation, uneven solidified shell, the local thin point source of cracks occurred in; mold level fluctuation, surface instability, but also makes casting billet appearance of oscillation marks intensified, resulting in the subsequent rolling process of crack. 　　To this end, the corresponding control measures S...

　　Welded steel pipe is a hot-rolled coil after molding machine, the use of high-frequency current skin effect and proximity effect, so that the edge of the tube is heated to melt under the action of squeezing rollers pressure welding to achieve production. 　　High frequency resistance welding method used in pipe production of the 1950s. Over the past decade, the production technologies are maturing, continuously improve product quality. 　　First, ERW steel pipe used in the production of raw material quality has been significantly improved, the steel component design of the low C, low P, S, micro-alloying; smelting process smelting, ladle refining, vacuum degassing, continuous casting and other new using technology; ERW pipe - ERW rolling process controlled rolling, controlled cooling technology enables the use of medium and large caliber ERW steel pipes hot strip appearance of size, appearance quality, physical and chemical properties greatly improved. On behalf of my hot strip high...

　　There are various kinds of steel pipes both in domestic and international markets for your selection, like the welded steel pipe . The steel pipe can be used as the long-distance oil and gas pipeline actually which can ensure the energy security actually. However, the surface of the stee pipe should be treated with great care to avoid the corrosion. Although the surface can't determine the corrosion totally, it has great influence except the weather condition, enviromental factors, coating type, quality and so forth. Hence, it is of great importance to learn how to coat the steel pipe in a simple but effective way. 　　For example, you are advised to clean it very carefully. In order to remove the grease, oil, dust, lubricants, you are advised to use solvent, emulsion to clean the steel surface actually. However, such cleaning can't help remove the surface rust, oxide, welding flux and so forth. So, you may need a steel wire brush and other tools to polish the steel surface t...

　　General Pipe: Average welded steel pipe used to transport low pressure fluid. With Q195A, Q215A, Q235A steel. Easy welding may also be used in other soft steel. Pipe to carry water pressure, bending, flattening and other experiments, there are certain requirements for surface quality, delivery is usually a length of 4-10m, often required length (or double length) delivery. Pipe specifications expressed with nominal diameter (mm or inch) nominal diameter different from the actual, pipe wall thickness according to the provisions of ordinary steel and thicker steel are two forms of steel pipe end divided by threaded and non- threaded two kinds. 　　 Galvanized steel pipe : To improve the corrosion resistance of steel, steel pipe for general (clarinet) galvanized. Galvanized steel pipe hot galvanized and zinc two kinds of electrical steel, hot dip galvanized thick galvanized, electro-galvanized and low cost. 　　Oxygen pipe: as steelmaking oxygen tube, usually with a small -diameter weld...

　　Bare steel pipe is different from coating steel pipe, bare steel pipe will eventually corrode, or rust. Since the total performance of a pipe coating system involves the three separate processes, application to the pipe, handling and storage of the pipe, and in-ground or above-ground service of the pipe; the functional requirements and the resistance to deterioration should be considered when establishing your criteria for the coating properties that we offer. 　 　Bituminous Asphalt Coating 　　The principal uses for asphalt coatings include internal and external application to carbon steel pipe . Our bituminous asphalt coating has been tested to meet ANSI-A21.4 and AWWA C104 specifications for potable water, and has been found to be acceptable and is certified to NSF Standard 61. This coating is black in color. When applied correctly, this fast coating process provides the cathodic protection required for most underground structural steel pipe. This is the least expensive method we...

　　In manufacturing and welding aspects 　　Comparatively speaking, longitudinal welded steel pipe has simple manufacturing and welding techniques. As the name shows, longitudinal pipe has a straight welding seam on the pipe surface. Different from the longitudinal pipe, the welding seam of which is vertical to the axial line of the pipe, helical welded pipe is rolled and welded according to certain helical angles. Therefore, helical welded pipe manufacturing, with complicated welding method, is more time-consuming. As for longitudinal welded pipes, to meet the required length of pipelines used in industry projects, short longitudinal pipes always need to be jointed and welded into a long enough pipe. Thus, inevitably, many T-shaped welding seams would appear in this welding process, largely increasing the possibility of welding defects. 　　Besides, T-shaped welding joints incline to cause welding residual stress, which lays potential risk for future fatigue crack. Therefore, though h...

　　Ceramic steel pipes are essentially different from traditional steel pipes, wear-resistant alloy cast steel pipes, cast stone pipes, and steel-plastic and steel pipes. The outer layer of the ceramic steel pipe is a steel pipe, and the inner layer is corundum. The corundum layer has a Vickers hardness of 1100-1500 (Rockwell hardness of 90-98), which is equivalent to tungsten-cobalt hard gold. The wear resistance is 20 times higher than that of the carbon steel pipe, and it is much superior to the corundum wheel which is usually bonded. Now the corundum grinding wheel is still the main grinding wheel for all kinds of grinding machines. 　　The corundum layer in the ceramic steel tube can wear away the corundum grinding wheel. The wear resistance of ceramic steel pipes is mainly due to the corundum layer with a thickness of several millimeters in the inner layer, and its Mohs hardness is 9, which is second only to diamond and silicon carbide. Its hardness is relatively high among all ox...