What is a seamless steel pipe? Seamless steel tubes are not uncommon in our lives, as long as we pay attention to what we can see, such as hot water pipes, our bicycle racks, etc., seamless steel pipes with the same bending strength and torsional strength, lighter weight characteristics It is widely used in construction, mechanical parts and other fields. In China, the strength of the brand is very strong, the same is true for seamless steel tubes. What is the difference between the performance of seamless steel tubes and conventional tubes? Let's take a look at the knowledge of seamless steel tubes.
What is a seamless steel pipe
Seamless steel tubes have a hollow cross-section and are used in large quantities as pipes for transporting fluids, such as pipes for transporting oil, natural gas, gas, water, and certain solid materials. Compared with solid steel such as round steel, steel pipes have a lighter weight when subjected to the same flexural and torsional strength, and are economical cross-section steels. They are widely used in the manufacture of structural and mechanical parts such as oil drill pipes, automobile transmission shafts, and bicycles. Frames and steel scaffolds used in construction and construction use steel pipes to make ring-shaped parts, which can increase material utilization, simplify manufacturing processes, save materials and processing man-hours, such as rolling bearing rings, jack sleeves, etc., have been widely used in steel pipes.
use
1, seamless steel pipe is widely used. General purpose seamless steel tubes are rolled from ordinary carbon structural steels, low alloy structural steels or alloy structural steels with the highest yield, and are mainly used as pipes or structural parts for conveying fluids. .
2, according to the use of different types of three types of supply: a, according to chemical composition and mechanical properties of supply; b, according to the mechanical performance of the supply; c, according to the water pressure test supply. Pipes supplied by Types a and b, if used to withstand liquid pressure, are also subject to hydrostatic testing.
3. Special-purpose seamless pipes include seamless pipes for boilers, seamless pipes for geological use, and seamless pipes for petroleum.
Seamless steel pipe production process
The production method of the seamless steel pipe is roughly divided into a diagonal rolling method (mannesmann method) and an extrusion method.
1. The oblique rolling method (Mannesmann method) is to use a diagonal roll to break the tube first, and then to extend it with a rolling mill. This method has a high production speed, but has a higher requirement for the processability of the tube blanks, and is mainly applicable to the production of carbon steel and low-alloy steel tubes.
2. The extrusion method uses a piercing machine to pierce tube blanks or steel ingots and then extrudes them into steel tubes using an extruder. This method is less efficient than the oblique rolling method and is suitable for producing high-strength alloy steel tubes.
The oblique rolling method and the extrusion method must first heat the tube blank or the steel ingot, and the produced steel tube is called a hot rolling tube. Tubes produced by hot working can sometimes be cold-worked as needed. There are two kinds of cold processing methods: one is cold drawing method, that is, drawing the steel pipe through a drawing pipe to make the steel pipe become thinner and longer; the other method is a cold rolling method, which is invented by the Mannesmann brothers. Hot-rolling mills are used in cold-working methods. Cold processing of seamless steel tubes can improve the dimensional accuracy and processing finish of steel tubes and improve the mechanical properties of materials.
Seamless steel pipe and traditional pipe performance difference
1. Compared with other traditional pipes, the seamless steel pipe supply pipe has lighter raw materials, high strength, good resistance, ability to withstand high internal pressure, making the use of sensitive, and can be accustomed to messy or bad geological conditions.
2. However, there is a large rate of end-use in the application of steel pipes, mainly due to the inconvenience of internal and external anti-corrosion treatment. The question of the primary external antiseptic is very important, and the quality of its external anti-corrosion directly affects its service life. Nowadays, the external corrosion protection of domestic steel pipes is mainly a concealed practice. All steel pipes are required to be reinforced or extra-strengthened. The cathodic protection is promoted in some regions. Concealed type of external anti-corrosion methods are usually coatings such as petroleum asphalt, epoxy coal tar pitch, etc. The latter is not easy to cure at low temperatures, and more questions are asked at the site of the weld construction, had previously used this chlorosulfonated polyethylene, Because most of the solvent, prone to pinholes, anti-breakdown failed, some areas are no longer clearly used. The anti-corrosion effect of the cathodic protection is better, but because of the method of selecting the sacrificial anode, it is necessary to replace the anode regularly during the operation in the future, which increases the operation cost and the operation.
Furthermore, there are three methods for the supply of seamless steel tubes: anti-corrosion coatings, resin mortars, and cement mortars. There are two questions about the three methods. The first is the bond strength between the coating and the steel pipe. Cement mortar has already been mentioned before. Both the anti-corrosion coating and the resin mortar require that the internal and external surfaces of the steel pipe be completely descaled before they can be constructed, but this is difficult to achieve. As a result, rust forms part of the source of subsequent delamination, which constitutes corrosion and scaling. Second, the vast majority of steel pipes are site-welded constructions and are preserved after welding. It can only be done manually. The quality is not easy to control, and, with regard to the smaller-diameter pipes, because the personnel cannot enter the construction, they are no longer preservative. Has also formed a hidden danger of future weld damage. Based on the analysis of the explosion accidents of several steel pipes, the main reason is that the quality of welds is not high.
3, seamless steel pipe supply higher overall cost.
4, poor hydraulic function, high energy consumption. The roughness coefficient within the pipe is between 0.013 and 0.014. This way, with regard to the same water delivery, the pipe with equal pipe diameter will have high resistance along the way. The demand will increase the lift of the pump and increase the investment in the early stage. Electricity is large, but also greatly increased.
5. The pipeline has the disadvantage of poor carrying capacity for water hammer.
Editor's summary: The relevant information on the difference between the performance of seamless steel pipes and traditional pipes was introduced here. I hope this article will be helpful to everyone. If you still have something you don't understand, you can leave a message to Xiaobian at the bottom. We will answer your questions as soon as possible.
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