GB/T 3091 - 2008 Q235B Welded Steel Pipe Detailed Introduction

GB/T 3091 - 2008 is the regulation of welded steel pipes in China's national standard, and Q235B is a common and important steel grade in this standard.
1. Chemical composition
The chemical composition of Q235B welded steel pipe mainly includes carbon (C), silicon (Si), manganese (Mn), sulfur (S), phosphorus (P) and other elements. Among them, the carbon content is moderate, which ensures a certain strength; silicon and manganese help to improve the strength and toughness of steel; the content of sulfur and phosphorus is strictly controlled to reduce the adverse effects on the performance of steel.
2. Mechanical properties
This type of welded steel pipe has good mechanical properties. Its yield strength is generally around 235MPa, the tensile strength can reach 370-500MPa, and the elongation is not less than 26%. These properties enable it to play an important role in many engineering structures to ensure the stability and safety of the structure.
3. Application field
Q235B welded steel pipe is widely used in various fields due to its excellent performance. In the construction industry, it is often used to build scaffolding, make steel structure frames, and transport water and coal gas, etc.; in the field of mechanical manufacturing, it can be used to manufacture various mechanical parts; in the petrochemical industry, it is used to transport fluids such as oil and natural gas; in the field of transportation, it can be used to make bridge structures, etc.
4. Advantages
Cost advantage: The price of Q235B steel is relatively low, making the cost of welded steel pipes more economical.
Good processing performance: It has good processability and can be processed by cutting, bending, welding and other processes to meet the needs of different projects.
Stable quality: During the production process, it is strictly controlled in accordance with national standards to ensure the quality stability of steel pipes.
5. Precautions for use
When using Q235B welded steel pipes, you need to pay attention to the following points:
Specification selection: According to the specific use environment and requirements, select appropriate specifications and sizes to ensure the bearing capacity and use effect of the steel pipe.
Transportation and storage: During transportation and storage, pay attention to avoid damage to the steel pipe such as collision and corrosion to avoid affecting its performance.
Welding process: Select appropriate welding process and materials to ensure welding quality and avoid welding defects.
Regular inspection: During use, the steel pipe should be inspected regularly to promptly detect and deal with potential problems to ensure safe use.
In short, GB/T 3091 - 2008 Q235B welded steel pipe is a steel product with reliable performance and wide application.