Penetration testing technology is only suitable for detecting surface defects. It uses penetrant to apply on the surface of the GL-A hot-rolled steel strip steel plate, then wipes the excess penetrant with the cleaning solution, and then smears the developer. The penetrant remaining in the defect is adsorbed by the developing material, so as to observe the shape of the defect and determine the type of defect. This GL-A hot-rolled steel strip method requires multiple wipes before and after the inspection, the process is more cumbersome, and can not detect internal defects and rough and dirty steel plates.
Temperature has a great influence on the strength of the material, GL-A hot-rolled steel strip. When the temperature exceeds a certain value, the strength limit of the steel will be reduced. The higher the temperature, the lower the strength. In addition, the longer the steel is used at high temperature, the lower the strength. Therefore, if the steel works at high temperature for a long time, the instantaneous strength of the steel can not be used as its performance index, nor can the room temperature performance replace the high temperature performance.
The yield strength of A40, D40, E40 and F40 GL-A hot-rolled steel strip is not less than 390N/mm^2, and the tensile strength is 510~660N/mm^2. A, D, E and F respectively indicate that they can be at 0° and -20 ° respectively. Impact toughness GL-A hot-rolled steel strip that can be achieved at -40℃, -60℃.
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