Standard Thickness of Carbon Steel Pipe

Carbon steel pipe is a steel pipe with carbon as the main alloying element, which is widely used in the transportation system of industrial fields such as petroleum, chemical, metallurgy, electric power, aviation, machinery, etc. The thickness of carbon steel pipe is an important parameter affecting its performance and use. According to international standards, the standard thickness of carbon steel seamless pipe and welded pipe should meet the following ranges:

1. Thickness range of seamless steel pipe: 0.5 mm - 60 mm;

2. Thickness range of welded steel pipe: 0.5 mm - 80 mm.

Standard of carbon steel pipe wall thickness

The wall thickness of carbon steel pipe should be determined by a specific calculation method, which is mainly based on the nominal diameter and root thickness coefficient of the pipe. The nominal diameter refers to the standard diameter of the pipe, while the root thickness coefficient is determined according to the type and purpose of the pipe.

The specific wall thickness calculation formula is: wall thickness = (nominal diameter × root thickness coefficient) / coefficient tolerance.

This formula provides engineers with a scientific basis for designing pipe wall thickness.

The corresponding relationship between the thickness and diameter of carbon steel pipes

The thickness of carbon steel pipes has a certain relationship with their diameters, and different specifications correspond to different thickness standards. Generally speaking, the larger the diameter, the greater the thickness. The following are the standard thicknesses and corresponding diameter ranges of some common specifications of carbon steel pipes:

1. Seamless steel pipes of Φ6mm - Φ38mm: thickness range of 1 mm - 4 mm;

2. Seamless steel pipes of Φ12mm - Φ325mm: thickness range of 2 mm - 28 mm;

3. Welded steel pipes of Φ18mm - Φ508mm: thickness range of 2.5 mm - 50 mm;

4. Large-diameter welded steel pipes of Φ219mm - Φ3000mm: thickness range of 5 mm - 80 mm.

Wall thickness deviation standard of seamless carbon steel pipes

The wall thickness deviation of seamless carbon steel pipes is one of the important indicators to measure their quality. According to the Chinese standard GB/T 8163-2018, there are certain regulations for the allowable deviation of the wall thickness of seamless carbon steel pipes.

1. For steel pipes with an outer diameter less than or equal to 159mm and a wall thickness less than or equal to 3mm, the allowable deviation of the wall thickness is ±12.5%; when the wall thickness is greater than 3mm, the deviation is ±10%.

2. For steel pipes with an outer diameter greater than 159mm, when the wall thickness is less than or equal to 20mm, the deviation is ±10%; when the wall thickness is greater than 20mm, the deviation is ±7.5%.

These standards are the basis for quality control in the production process to ensure the performance and safety of seamless steel pipes.

In addition, there are specific standards for the allowable deviation of the wall thickness of cold-drawn (rolled) steel pipes. When the wall thickness is less than or equal to 3mm, the deviation is ±0.2mm; when the wall thickness is greater than 3mm, the deviation is ±7.5%. These regulations are intended to ensure the uniformity of the wall thickness and product quality of cold-drawn (rolled) steel pipes.

Thickness selection in different application scenarios

In actual applications, the thickness of carbon steel pipes should be selected according to specific usage scenarios and needs.

For example, in the field of low-pressure fluid transportation, thin-walled mild steel pipes are widely used because of their lightness and economy; in high-pressure, high-temperature or complex applications, such as petroleum, chemical and other industries, thick-walled carbon steel pipes of corresponding thickness need to be selected to ensure the stability and safety of the pipeline system. The following are the main uses of carbon steel pipes:

1. Transportation of oil, natural gas, fuel gas and other liquids;

2. Transportation of various chemicals in the chemical industry;

3. Transportation of food processing;

4. Manufacturing of parts for machinery, construction, automobiles and other industries, such as pup joints and pipe fittings for connection of supporting products

5. The structure of pipelines and pipeline equipment.

Summary

In summary, the standard thickness of carbon steel pipes is determined according to different specifications and uses, and generally ranges from 0.5 mm to 80 mm. In the process of selecting carbon steel pipes, factors such as pressure and temperature in pipeline transportation should be considered to select appropriate thickness and specifications.

Read more: Roughness of carbon steel pipe or Finishing defect of seamless carbon steel pipe and its prevention