What are the specified values ​​for steel pipe wall thickness

Steel pipes are an important building material and are widely used in various fields. The wall thickness of steel pipes is one of its important parameters, which is directly related to the strength, load-bearing capacity, and service life of steel pipes. So, what are the specified values ​​for steel pipe wall thickness?

1. Relevant standards and specifications
The specified values ​​for steel pipe wall thickness are mainly based on relevant national standards and specifications, the most important of which is the “Technical Specifications for Steel Pipe Engineering” (GB 50017-2017). This standard gives corresponding wall thickness regulations for different types of steel pipes to ensure that the steel pipes can meet safety performance requirements during use.

2. Classification of wall thickness
According to the purpose and material properties of steel pipes, wall thickness can be divided into three types: conventional wall thickness, thickened wall thickness, and extra thick wall thickness.

- Conventional wall thickness: Conventional wall thickness steel pipes refer to wall thicknesses that can meet the load-bearing and use requirements under normal use conditions. The common wall thickness specified values ​​of this type of steel pipe are generally between 1.5mm and 4.5mm, and the specific values ​​need to be determined according to actual engineering needs and standard specifications.
- Thickened wall thickness: Thickened wall steel pipes are used to bear greater pressure or in special environments, such as industrial pipelines, high-pressure vessels, etc. The wall thickness of this type of steel pipe is generally greater than the conventional wall thickness, and the specific value is generally between 4.5mm and 10mm.
- Extra thick wall thickness: Extra thick wall steel pipes are used for special engineering needs, such as offshore platforms, nuclear power plants, etc. The wall thickness of this type of steel pipe is generally greater than 10mm, and the specific value needs to be determined based on actual engineering requirements and design calculations.

3. Principles of wall thickness selection
When selecting the wall thickness of steel pipes, it is necessary to determine it based on specific engineering requirements and the use environment. Generally speaking, the wall thickness selection should follow the following principles:
- Carrying capacity: The wall thickness of the steel pipe must be able to meet the bearing requirements, be able to withstand the working load and external forces and ensure the stability and safety of the structure.
- Service life: Steel pipes with appropriate wall thickness can increase service life, reduce maintenance and replacement frequency, and reduce use costs.
- Economic efficiency: Under the premise of meeting safety and service life, choosing a reasonable wall thickness can reduce the use of materials and reduce costs.
- Engineering requirements: The selection of steel pipe wall thickness should also consider the requirements of specific projects, such as the nature of the medium in the pipeline, fluid pressure, temperature changes, and other factors.

4. Determination of the specified value of wall thickness
The specified value of the wall thickness of the steel pipe is generally obtained through experiments and calculations and is corrected in combination with engineering practice and experience. The range and allowable deviation of the wall thickness of the steel pipe are given in national standards and specifications to ensure the quality and safety of the steel pipe.

In summary, the specified value of the wall thickness of the steel pipe is determined according to national standards and specifications and is generally divided into three types: conventional wall thickness, thickened wall thickness, and extra thick wall thickness. When selecting the wall thickness of the steel pipe, factors such as bearing capacity, service life, economy, and specific engineering requirements need to be considered, and the requirements of relevant standards and specifications should be followed. By reasonably selecting the wall thickness, it can be ensured that the steel pipe meets the safety performance requirements during use while reducing costs and extending service life.