low temperature carbon steel pipe

Low temperature steel pipes are medium carbon structural steel, and both cold and hot and low temperature steel pipes have good mechanical properties, low prices, wide sources, and wide applications. Its biggest weakness is its low hardenability, and it is not suitable for workpieces with large cross-sectional dimensions and high requirements.

Low temperature resistant steel pipe cutting and retail, low temperature resistant steel pipe wire processing, using low sulfur, low phosphorus, high purity steel and undergoing calcification treatment can effectively reduce the low-temperature brittleness of the steel and improve the impact toughness of the product. The company has a cooling tank of 0~-100 ℃, which can conduct low-temperature impact tests in batches.

Ensure the quality stability of the factory products. Low temperature resistant steel pipes are mainly used for -45 ℃ to -195 ℃ grade low-temperature pressure vessel pipelines and low-temperature heat exchanger pipelines, and can also be used for fluid transportation in low-temperature environments. The low-temperature resistant oil casing of API 5CT is mainly used for oil well production in extremely cold regions.

1. Low temperature steel pipe is an important basic material for petroleum, chemical, nuclear industry and other industries, and it is widely used.

2. In many fields, the performance requirements for low-temperature pipelines are very high. If the temperature of the conveying medium is between -196 ° C and -404 ° C, the working pressure is generally not greater than 2.5 MPa (megapascals).

3. Used for liquid or gas transmission pipelines and engineering supporting pipes.

4. Structural components for heating furnaces, evaporators, and reboilers used in the chemical industry.

5. Connecting pipeline and valve of heat exchanger of distillation equipment in oil refinery.

6. Equipment and components of food and drinking water treatment systems, as well as pipelines in agricultural irrigation and drainage systems.

7. The connecting pipeline for the supply and return air devices in the sand well of the mine.

8. Corrosion resistant pipelines in seawater utilization devices.

9. Imported air ducts for various refrigerators and freezers.

10. Process piping for transporting high-temperature and high-pressure fluids and corrosive fluids on fertilizer equipment.

11. The catalyst layer and its supports in the petrochemical cracking process.

12. Insulation of the digester and condenser tubes in papermaking machinery.

13. Oil field injection well water-cooled wall heating and pressure reducer.

14. Steam water separation reheater in thermal power plants.

15. Buried drainage pipes for oil depots.

16. Long distance oil (gas) pipelines.

17. Protective sleeve for submarine optical cables.

18. Flexible cables for natural gas trunk transportation.

19. Lng natural gas pipeline in the "West East Gas Pipeline" project.

20. High and low pressure polyethylene outer sheath for the "Sichuan East Gas Transmission" project.

21. Urban streetlight poles.

22. Outdoor heating and cooling pipelines.

23. Longitudinal isolation and noise reduction pillars for highways.

2. Medium pressure pipeline (Class M): Pipelines that withstand working pressures between 0.1MPa and 1.6MPa belong to the medium pressure pipeline class and are usually used to transport liquids or gases under normal working conditions.

3. High pressure pipelines (Class H): Pipelines that withstand working pressures between 1.6MPa and 10MPa belong to the high-pressure pipeline class and are usually used to transport high-pressure liquids or gases.

4. Ultra high pressure pipelines (Class U): Pipelines that withstand working pressure greater than 10MPa belong to the ultra-high pressure pipeline class and are usually used to transport high-pressure liquids or gases under special requirements.

In addition, according to the American standard (ASME B31.3), the grade of pressure pipelines can also be classified based on pipeline material, design temperature, and design pressure. The classification criteria are as follows:

1. Level 1: Suitable for carbon steel pipelines under low and high temperature conditions. The design temperature is below -29 ° C or above 260 ° C, and the design pressure is below 1.03MPa.

2. Level 2: Suitable for carbon steel pipelines with higher temperatures and pressures. The design temperature is below -29 ° C or above 260 ° C, and the design pressure is between 1.03MPa and 103MPa.

3. Level 3: Suitable for stainless steel pipes and nickel based alloys. The design temperature is below -29 ° C or above 260 ° C, and the design pressure is between 1.03MPa and 148.2MPa.

4. Level 4: Suitable for various materials of pipelines under high temperature and high pressure conditions. The design temperature is below -29 ° C or above 343 ° C, and the design pressure is between 1.93MPa and 206.8MPa.