微合金鋼連鑄板坯表面裂紋的成因與防止措施

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摘 要：結合生產實際，分別采用光譜分析儀、金相顯微鏡、掃描電鏡及能譜儀對鑄坯與板材表面裂紋處的化學成分、金相組織、顯微形貌及夾雜物成分進行分析，并對生產工藝進行調查研究，確定鋼板裂紋在連鑄-加熱-軋制過程中的形成機理，從而提出進一步降低板坯裂紋的可行性建議及工藝優(yōu)化措施。

關鍵詞：連鑄板坯；裂紋缺陷；金相分析；防止措施

CAUSES AND PREVENTIVE MEASURES SURFACE CRACK IN ALLOYED CONTINUOUS CASTING SLAB

Wang Huifeng

（Hebei Yanshan Iron & Steel Co.， Ltd.    Qianan    064403， China）

Abstract：Combined with the actual production，spectrum analyzer，metallographic microscope， scanning electron microscope and energy spectrometer were apployed on the analysed of micro alloy steel continuous casting slab surface crack formation mechanism and solving measures and carries on the investigation and study to the production process， determine the steel plate crack in continuous casting - heat - forming mechanism in the process of rolling，to further reduce the feasibility of slab crack advice and process optimization measures.

Key words：continuous cast slab；crack defect；metallographic analysis；preventive measures

0    前    言

河北燕山鋼鐵集團有限公司板坯連鑄機是直結晶器連續(xù)彎曲連續(xù)矯直弧形板坯連鑄機，其基本半徑R為9.5 m，厚度規(guī)格230 mm，寬度在900～1 630 mm。（剩余3430字）