Case One: Slow Rolling Speed Leads to Performance Decline

Case Background: In the production of high - strength shipbuilding steel plates, a certain steel mill set the rolling speed too low in the rough - rolling stage to ensure the sufficient deformation of the casting billet. The designed rolling speed of its rough - rolling equipment can reach 1.5 - 2.0 meters per minute, but in actual production, only a speed of 0.8 - 1.0 meters per minute is adopted.

Influence on Mechanical Properties: Due to the long residence time of the billet between the rolls and being in a high - temperature environment for a long time, local overheating occurs in the billet. This makes the internal structure of the steel uneven, and the grains in some areas grow abnormally. During the mechanical property test, it is found that the yield strength and tensile strength of this batch of shipbuilding steel plates have decreased by about 10% - 15%. Originally, the yield strength of this grade of shipbuilding steel plates should reach more than 355MPa, but in practice, it can only reach around 300 - 320MPa; the tensile strength should normally be between 490 - 620MPa, but in reality, it is only around 430 - 470MPa. At the same time, due to the uneven structure, the toughness of the steel is also reduced. The impact toughness test value has decreased by about 20%, and cracks are more likely to appear when subjected to external impacts.

 

 

 

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