Cause Analysis of Corner Crack of European Standard Low Temperature and High Strength Steel Plate
YIN Xiaopeng
CHENG Xinli
XU Ruiliang
Abstract：During the production process of the European standard 355 MPa grade low-temperature and high-strength steel plate,in response to the problem of transverse cracks at the corner position of the lower surface of the head,in-depth exploration of the root cause of the crack formation was carried out by means of metallographic analysis,scanning electron microscopy observation and energy spectrum analysis.Research shows that the main causes of cracks lie in the oxidation reaction of the continuous casting billet during the heating stage and the uneven cooling phenomenon under the winter smelting conditions.In view of this,through the optimization of the production process,including the precise regulation of the cooling water temperature,the control of the billet pulling rate and the strengthening of the flame cleaning process,etc.,the crack incidence rate has been significantly reduced.The improvement has laid a solid technical foundation for the reliable application of European standard high-strength steel plates in low-temperature environments.The process parameters of flame cleaning were strengthened,and a systematic process improvement plan was formed.After optimization,the crack incidence rate was significantly reduced,ensuring the service reliability of the steel plate in a low-temperature environment.
Keywords：european standard high-strength steel platelow-temperature resistance performancetransverse crackoxidation reaction of continuous casting billetsprocess optimizationcrack control strategy
Publication Date：2025-04-25
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：4( 46-49 )