1. Processing performance
Processing steel into required structural components requires a series of processes, including various machining (milling, planer, drilling), cutting, cold and hot rectification and welding, etc. The technological properties of steel should meet the needs of these processes, and the phenomenon of steel cracking or material damage can not occur in the process of processing. The good plasticity of low carbon steel and low alloy steel meets the processing requirements to a great extent.
2. Cold Bending Performance
The cold bending property of steel is a comprehensive property judged by 180 degree bending test of specimens. When the steel is bent 180 degrees at room temperature, it is considered to be qualified if the outer surface and side are not cracked and the layer is not formed. When bending, different bending diameter D (which can be changed in the range of 0.5-3 plate thickness) is allowed according to the steel grade and plate thickness.
3. Weldability
Weldability refers to the adaptability of steel to welding process, which includes two requirements: one is that a certain welding process can ensure good mechanical properties of welded joints; the other is that in the construction process, it is possible to avoid the sensitivity of hot (cold) cracks in weld metal and steel heat-affected zone by selecting suitable welding materials and welding parameters. Weldability evaluation of steel can be divided into two methods: chemical composition discrimination and process test evaluation. Chemical composition discrimination is to judge the weldability of steel by the content of carbon equivalent. That is to say, all the elements that have significant influence on welding in the chemical composition of steel are converted to the content of carbon. Carbon element is not only the main element to form the strength of steel, but also the primary element to affect weldability. Steel containing more than a certain amount of carbon can not even be welded. The higher the carbon equivalent, the worse the solderability.