Selection and use of low temperature seamless pipe materials

Low temperature seamless pipe, as the name implies, is a kind of low temperature resistant seamless pipe, which is processed at low temperature and can be used for liquid and gas pressure pipelines and gas pipelines in various industries. In extreme low-temperature environments, the performance of seamless steel pipes is particularly important. As a leader in this field, low-temperature seamless steel pipes have won the favor of many industries with their excellent low temperature resistance and stable mechanical properties. Today, let's take a deeper look at the grades and materials of low-temperature seamless pipes.

Materials for low-temperature seamless pipes:

Generally, low temperature refers to the range of -20℃~-196℃. Low temperature is deep low temperature and ultra-low temperature, which are less used in petrochemical enterprises. Low-temperature seamless pipes are suitable for -45℃~-195℃ low-temperature pressure vessel pipelines and low-temperature heat exchanger pipelines.

For the selection of seamless steel pipe materials, the following classification can be made within the range of -20℃~-196℃:
-20℃~-40℃ Carbon steel pipes are not suitable
-40℃~-70℃ Low alloy steel pipes are not suitable
-70℃~-196℃ General alloy steel pipes are not suitable

-196℃ and below Low carbon ordinary stainless steel pipes are not suitable

Selection of low temperature seamless pipe materials:

The material selection of low temperature seamless pipes is directly related to their performance in low temperature environments. Common low temperature seamless steel pipe materials include low temperature carbon steel, low temperature alloy steel, etc. These materials have been strictly screened and tested during the design and production process to ensure that they can maintain stable performance at extremely low temperatures.

Low temperature carbon steel, as a common low temperature seamless steel pipe material, has excellent low temperature toughness and weldability. By controlling the carbon content and the content of other elements, low temperature carbon steel can maintain its strength and toughness at extremely low temperatures, making it difficult for seamless steel pipes to break or deform in low temperature environments. Common low-temperature carbon steel materials include ASTM A333 Gr.6, ASTM A420 WPL6, etc. These grades represent different chemical compositions and mechanical properties to meet the needs of different industries.

Low temperature alloy steel is another important material for low-temperature seamless steel pipes. By adding alloy elements such as Cr, Mo, and Ni to steel, low-temperature alloy steel can significantly improve its low-temperature performance, corrosion resistance, and hydrogen resistance. This makes low temperature alloy seamless steel pipes widely used in petrochemicals, cryogenic equipment and other fields. Common low-temperature alloy steel materials include ASTM A333 Gr.3, ASTM A333 Gr.9, etc. These grades represent different alloy element contents and mechanical properties to meet the needs of different working conditions.

It should be noted that since low-temperature pipeline materials are brittle at low temperatures, causing the risk of pipe system rupture, the components of pipelines with a medium temperature lower than or equal to -20°C should be selected according to the impact performance requirements.

How to choose and use low-temperature seamless steel pipes?

1. Understand the material of the product
Understand the low-temperature seamless steel pipes of different materials. Before choosing, you need to understand several common materials, such as low-temperature carbon steel pipes, low-temperature alloy steel pipes, etc. They each have their own advantages and scope of application, and you need to choose according to your specific needs.

2. Consider the size and thickness of the pipe
When choosing low-temperature seamless steel pipes, consider the size and thickness of the pipes. This is very important because different applications require pipes of different sizes and thicknesses. You can choose the right size and thickness according to your engineering requirements to ensure that they can meet your needs and have good durability.

3. The quality and surface treatment of the pipe
Quality is the key factor in determining whether a product is reliable and durable, while the surface treatment affects the appearance and corrosion resistance of the pipe. Therefore, remember to choose those low-temperature seamless steel pipes that have undergone strict quality control and surface treatment to ensure that they can work well in various environments.

4. Compare prices and services
There are many suppliers on the market that provide low-temperature seamless steel pipes, so you might as well compare prices before buying. At the same time, it is also very important to understand the reputation and after-sales service of some suppliers.

5. Correct installation
When installing low-temperature seamless steel pipes, follow the correct installation method to ensure that they are firmly installed and avoid leakage and other problems. At the same time, ensure that the pipe is clean to prevent impurities from damaging the steel pipe.

6. Regular inspection
When using low-temperature seamless steel pipes, regular inspections, including pressure tests, leak tests, etc., are required to ensure stable performance. At the same time, pay attention to the use of the steel pipes, and handle any abnormalities in a timely manner.

7. Maintenance
In order to maintain the good performance of low-temperature seamless steel pipes, proper maintenance is required. This includes regular cleaning of the inside of the steel pipe, replacement of worn parts, etc.

Conclusion:
In terms of grade selection, different low-temperature seamless steel pipe materials have different usage standards. These grades and standards represent the requirements of the chemical composition, mechanical properties and manufacturing process of the steel pipe. When users choose low-temperature seamless steel pipes, they should choose suitable materials and grades according to their own needs and working conditions to ensure the performance and reliability of the steel pipes.

Read more: Which material is used for boiler tubes? or Seamless Steel Pipe Sizes and Weights