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From the welding process point of view. Whether it is straight seam steel pipe or spiral steel pipe, the welding method for both is the same. However, in the actual welding process, there are often a large number of T-shaped welds in straight seam welded pipes. In such welds, there is usually some residual stress present. Although this does not have much impact on use, it is precisely because of these residual stresses that the possibility of cracks in straight seam steel pipes is increased.
Basically, spiral steel pipe or straight seam steel pipe is a type of welded steel pipe. Due to their superior properties, these two steel pipes are widely used in various projects. Of course, due to the different production processes of the two, there are still big differences in the actual use process, which directly leads to a big difference in the use range of the two steel pipes.
Compared with spiral steel pipes, the production process of straight seam steel pipes is much simpler. There are two main production processes for straight seam steel pipes, one is high-frequency welded straight seam steel pipes, and the other is submerged arc welding straight seam steel pipes. It is precisely because of these characteristics that the production process of straight seam steel pipes is simple, the production efficiency of straight seam steel pipes is very high, the cost is low, and the development speed is also very fast.
The production of large-diameter straight seam steel pipes in the industry will use T-shaped welding technology, which means splicing short sections of straight seam steel pipes into lengths that meet engineering requirements, which greatly increases the probability of T-shaped welding defects in straight seam steel pipes. In addition, the welding residual stress at the T-shaped weld is also large. Weld metal is susceptible to stress effects, which increases the likelihood of cracks.
Compared with straight seam steel pipes, spiral steel pipes have certain advantages in strength. The main process for producing spiral steel pipes is submerged arc welding. Spiral steel pipes can be used to produce welded pipes of different diameters from blanks of the same width. It can also be used to produce larger diameter welded pipes from narrower blanks. But compared with straight seam pipes of the same length, the length of welded pipes is increased by 30-100%. Due to the above reasons, the production speed of spiral steel pipes is very slow. Therefore, straight seam welding is mainly used for small diameter welded pipes. Spiral welding is mainly used for large diameter welded pipes.
In addition, according to the submerged arc welding process specifications, each weld should have an arc starting point and an arc extinguishing point. However, every straight seam steel pipe cannot meet this condition when welding circumferential seams. Therefore, there may be more welding defects at the arc extinguishing point. When a pipeline is subjected to internal pressure, two main stresses are usually generated on the pipe wall, namely radial stress and axial stress.
People always ask, what is the difference between spiral steel pipe and straight seam steel pipe? Which steel pipe is better to use in construction? In fact, it is unscientific to answer whether it is straight seam steel pipe or spiral steel pipe.
Specifically, spiral steel pipes and straight seam steel pipes are both welded pipes. Both are usually used in different fields.
Because the weld is spiral, the liquid pressure on the spiral steel pipe will be distributed on each side of the pipe. Enhance pipe strength.
If straight seam steel pipes are used, generally large pipes are rolled up with steel plates and directly welded. Larger steel plates are needed. This greatly increases the difficulty of manufacturing. Therefore, spiral pipes will be used for larger pipe diameters.
Classification of stainless steel pipes1. Classification by production method:
(1) Seamless tubes - cold drawn tubes, extruded tubes, cold rolled tubes.
(2) Welded pipe:
(a) Classification by process - gas shielded welded pipe, arc welded pipe, resistance welded pipe (high frequency, low frequency).
(b) According to welding seam - straight seam welded pipe, spiral welded pipe.
2. Classification according to cross-sectional shape: (1) circular steel pipe; (2) rectangular pipe.
Spiral steel pipe stacking requirements1. The principle requirement for stacking spiral steel pipes is to stack them according to types and specifications on the premise of ensuring stable stacking and ensuring safety. Different types of materials should be stacked separately to prevent confusion and mutual erosion;
Advantages of Using Carbon Steel in ConstructionSteel is an alloy metal, which means it’s a combination of several types of elements. In the case of steel, this is a combination of iron, carbon, and trace elements. It has a number of advantages for construction applications due to the fact that it’s fairly inexpensive to manufacture and has a very high tensile strength.
What determines the type of steel is the ratio of elements used to produce it, and it’s the magic formula of the carbon steel alloy created that makes it preferred for many projects. While there are thousands of different types of steel, these types are generally bucketed into four categories: carbon steel, alloy steel, stainless steel, and tool steel.- Anti-corrosion steel pipe classificationPN8710 anti-corrosion
When there are many types of corrosive media in steel pipes, such as acids, alkalis, salts, oxidants and water vapor, the coating must be chemically inert and resistant to acid, alkali and salt corrosion. The coating film should have a dense structure, good waterproof permeability and strong adhesion. , tough and plump. In this case, IPN8710 anti-corrosion is suitable. 
Global crude steel production fell 4.3% year-on-year in MarchOn April 23, the World Steel Association (WSA) released global crude steel production data for March. In March, crude steel output in the world's 71 countries and regions included in the statistics was 161.2 million tons, a year-on-year decrease of 4.3%. In the first quarter of this year, crude steel output in the world's 71 countries and regions included in the statistics was 469 million tons, a year-on-year increase of 0.5%.
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