Straight seam steel pipe vs seamless carbon steel pipe

Straight seam steel pipe vs seamless carbon steel pipe

What we often see in life should be seamless carbon steel pipes, straight seam steel pipes and welded pipes. The editor below will briefly explain to you how to distinguish between straight seam steel pipes and seamless carbon steel pipes, and see what the differences are between the two!

1. Generally, the sizes of straight seam steel pipes we come into contact with are fixed. The more common ones are six meters, nine meters, and twelve meters. Basically, the size of the steel pipe is made according to the customer's needs. However, seamless carbon steel pipes rarely come in fixed sizes. Why? Because if seamless carbon steel pipes are made into fixed sizes, the cost will increase, and the price will naturally be high. Under normal circumstances, basically many customers cannot accept it.

2. We can also look at the cross-sections at both ends of the pipe. If there is rust on it, wipe it clean and check again. If you look carefully, you will find traces of welding on it.

①The quality inspection and acceptance of straight seam steel pipes shall be inspected and accepted by the supplier's quality supervision department.

② The supplier must ensure that the delivered straight seam steel pipes meet the requirements of the corresponding product standards. The purchaser has the right to inspect and accept products in accordance with corresponding product standards. If it is not qualified, it will not be passed.

③The inspection items, sampling quantity and inspection methods of straight seam steel pipes must comply with the requirements of the corresponding product standards. With the consent of the purchaser, hot-rolled seamless straight seam steel pipes can be sampled in batches according to the rolling root arrangement.

④ When any of the inspection results of straight seam steel pipes does not meet the product standard requirements, the non-compliant one should be immediately picked out and samples of the same batch should be taken immediately. This batch of straight seam steel pipes will be inspected twice as much for unqualified items. If the re-inspection result fails, the batch of straight seam steel pipes cannot leave the factory.

⑤ If there are no special provisions in the product standards, the chemical composition acceptance of the straight seam steel pipe should be carried out according to the melting composition of the straight seam steel pipe. This is also one of the ways to distinguish.

3. Straight seam steel pipe is a steel pipe with only one longitudinal weld seam. According to the process, it can be divided into straight seam submerged arc welded steel pipe and straight seam submerged arc welded steel pipe. Straight seam steel pipe is a steel pipe in which the weld seam is parallel to the longitudinal direction of the steel pipe.

seamless carbon steel pipes have hollow sections and are mainly used as pipelines for transporting fluids, such as pipelines for transporting oil, natural gas, coal gas and certain solid materials. Structurally, the difference is not very big. Straight seam steel pipes are not seamless carbon steel pipes. The center of mass of the welded pipe must not be in the middle. Therefore, when we use it as a pressure component during construction, we should pay more attention to the welding seams of welded pipes.

seamless carbon steel pipe (A53 steel pipe) is limited by the processing technology, and the wall thickness of the steel pipe will not be very thin. The biggest difference between seamless and welded pipes is that they are used to transport pressurized gases or liquids.

How to reduce the loss of seamless carbon steel pipes?

seamless carbon steel pipes (ASTM A106 steel pipes) are used in an increasingly wide range of applications. How should people keep the grade of seamless carbon steel pipes unchanged throughout the entire application process of seamless carbon steel pipes?

1. Improve the glossiness and overall wear resistance of the surface layer of seamless carbon steel pipes, thereby extending the service life. The key is that it can improve integration with other traditional metal materials. At this stage, for stainless steel passivation of seamless carbon steel pipes, the key to using chromate passivation is to add some activation to the passivation. After passivation, reagents such as chloride, ammonium sulfate or hydrochloric acid can cause the chromate film to thicken. When the passivation agent contains chloride, it can reduce the interfacial tension of the steel chain, accelerate the demulsification reaction, improve the chemical polishing effect, and make the coating delicate and bright.

2. When manufacturing seamless carbon steel pipes, we must not only pay attention to relevant production processes, but also ensure the accuracy of mid- and late-stage production and processing and technical solutions, adding double protection to finished products and seamless carbon steel pipes. Steel pipes not only need to be improved in appearance quality, but also have become a raw material with strong processing capabilities at this stage.

3. Improve the arc accuracy of the casting machine, prevent the heterogeneous sheet from generating excessive ground stress in the early stage of solidification, and avoid cracks along the grain boundaries.

4. Use methods to appropriately speed up the forging of seamless pipes and expand the cooling water flow within a certain range to increase the water flow and lower the temperature to maintain forced cooling.

5. Strictly control the steel composition, especially the carbon and water content.

6. The seamless pipe improves the electromagnetic induction stirring of steel rolling and controls the superheat of molten steel in the tundish below 40°C.