Seamless steel pipe is a long strip steel with a hollow section and no joints around it. The ingot is made by punching a steel ingot or a solid tube and then hot-rolled, cold-rolled or cold drawn. The following small series for everyone to introduce the relevant knowledge of seamless steel tubes.
The use of seamless steel pipe:
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 three types of supply:
a. Supply according to chemical composition and mechanical properties;
b. Supply according to mechanical performance;
c. Supply by water pressure test. 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 inferior identification:
1. The inferior seamless steel pipe is easy to be scratched. The reason is that the inferior seamless steel pipe manufacturers are poor in equipment and easy to produce burrs and scratch the surface of the steel. Deep scratches reduce the strength of the steel.
2. The shoddy seamless steel tube has no metallic luster and is pale red or similar to that of cast iron.
3. The horizontal and vertical cross-bars of counterfeit seamless steel tubes are thin and low, and often appear to be filled with dissatisfaction. The reason is that manufacturers have to achieve large negative tolerances, and the amount of reduction in the first few passes of the finished product is too large, the iron type is too small, and the hole type is not full.
4. The cross section of shoddy and seamless steel tubes is elliptical. The reason is that in order to save materials, the rolling amount of the first two rolls of the finished rolls is too large. The strength of such seamless steel tubes is greatly reduced, and it does not meet the seamless steel tube outer dimensions. The standard.
5. High-quality seamless steel pipe has uniform composition, high tonnage of cold-shearing machine, and smooth and neat cutting end face, while inferior and inferior seamless steel pipes often have a phenomenon of falling meat due to poor material, ie uneven and non-metallic luster. . And because shoddy manufacturers have fewer products, big ears will appear at the head and tail.
6. The inferior seamless steel pipe material contains many impurities, the density of the steel is small, and the size of the seamless steel pipe is so serious that it can be weighed and checked without a caliper. In general, the phasing effect will be better, mainly considering cumulative error and probability theory.
Seamless steel pipe in addition to embroidery method:
Steel is a metal material with iron as the main element and carbon content generally below 2.0% and containing other elements. The difference between it and iron is the content of carbon. It should be said that he is tougher and durable than iron. Although it is not easy to rust, it is hard to be eroded. If it is eroded and not treated in time, it can be easily eroded. Lose what it should have.
When the seamless steel pipe rusts, what are the usual treatment methods? Some people will use the cleaning method to clean the stainless steel tube. When cleaning, the surface of the steel material should be cleaned with solvent and emulsion. This method is only used as an auxiliary means of anti-corrosion and can not really remove the stainless steel tube. The role of rust. We can also use a steel brush, wire ball, etc. to remove loose oxide and rust from the surface before cleaning. However, if we do not do good preventive measures, we will still be eroded again.
Pickling is also one of the methods for removing rust. In general, chemical and electrolytic methods are used for pickling. Pipeline anti-corrosion uses only chemical pickling. Although this method can achieve a certain degree of cleanliness but is prone to environmental pollution, it is not recommended.
The use of spray derusting, high-power motor driven by high-speed rotation of the spray blade, so that steel sand, steel shot, wire segment, minerals and other abrasive under the action of centrifugal force on the stainless steel pipe surface spray treatment. Not only can it completely remove rust, oxides, and dirt, but it can also achieve the required uniform roughness under the abrasive impact of abrasives and friction forces. Jet rust removal is an ideal rust removal method for pipeline anticorrosion methods. Many of these physical theories are used to give the environment a small amount of pollution and are clean and thorough.
Seamless steel pipe maintenance:
The knowledge of Seamless Steel Tube Seamless Steel Tube Many people know more about it, but many people only know the production, sales, use, etc. of seamless steel tube, but there is still a part that is very important, that is, maintenance. And maintenance!
In the manufacture of seamless steel tubes, the pickling process of steel tubes is involved. For workers, what issues need to be noted when pickling seamless steel tubes.
First, labor protection products must be worn before pickling. A detailed inspection of the site's work environment is also required, mainly to check whether the slings of the steel pipe are in good condition and to perform the work only after the confirmation.
The second is pickling, pickling is mainly used hydrochloric acid, generally hydrochloric acid content of 18% to 20% of the best.
The third staff member also needs to understand the concentration and temperature of the acid and the tonnage of the pickling tube in the tank before the operation. These can be detected using professional measuring equipment.
Fourthly, it is better to control the weight of the acid-washed steel pipe between 2 and 5 tons at a time, and control the time between 5 and 15 minutes. The time needs to be adjusted according to the weight. In the pickling process of the steel pipe, frequent vibrations are also required. When the pipe is run down the acid tank, the steel pipe must be tilted to prevent accidental injury to humans by hydrochloric acid.
Editing summary: The above is Xiaobian's introduction to seamless steel pipe related knowledge, more practical knowledge, please pay attention to Qijia information.
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