How to choose steel in steel structure engineering?

At present, many buildings are constructed using civil engineering and Guangxi steel structure processing. When using steel construction, more attention needs to be paid to the safety of materials. So, how to choose steel when constructing steel structure processing projects? Mainly look at the following points:

1 security level

For general industrial and civil building structures, ordinary quality steel can be selected according to the nature of the project. According to the specified safety level, it is divided into first level (important), second level (general) and third level (secondary). Different safety levels require different steel quality.

2 loading

The structure that directly bears dynamic load and the structure of strong earthquake area should use steel with good comprehensive performance; generally, the structure that bears static load can choose lower price Q235 steel.

3 connection method

There are welding and non-welding connection methods. Improper or unprofessional operation during the welding process may cause welding deformation, welding stress and other welding defects, such as meat biting, pores, cracks, etc., which may cause structural cracking or brittle fracture. Therefore, the welded structure is not a material. The requirements should be stricter. For example, in terms of chemical composition, welded structures must strictly control the limited content of carbon, sulfur, and phosphorus; non-welded structures can reduce the carbon content requirements.

4 Working environment conditions where the structure is located

Steel tends to become cold and brittle at low temperatures. Therefore, structures that work under low temperature conditions, especially welded structures, should use killed steel with good low-temperature brittle fracture resistance. In addition, open structure steels and hazardous media steels are prone to corrosion, fatigue and fracture. Different materials should be selected separately to do a good job in anti-corrosion work.

5 Steel thickness

The thin steel plate has many rolling times, the rolling compression ratio is large, and the thick steel plate compression ratio is small, and the plasticity, impact toughness and welding performance are also poor. Therefore, the welded structure with larger thickness should be made of steel with better material.

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