Transactions of Materials and Heat Treatment

Title：Study on edge peeling defect mechanism of medium and heavy plate for 2205 duplex stainless steel

Authors： Ren Peidong Zhang Youyu Ji Xianbin Pan Hongtao

Unit： JISCO

KeyWords： duplex stainless steel equiaxed crystal columnar crystal microcrack edge peeling

ClassificationCode：TG335

year,vol(issue):pagenumber：2019,44(9):33-39

Abstract：

The edge peeling defect of medium and heavy plate for 2205 duplex stainless steel was analyzed by SEM, then it found that the composition and morphology of oxide scale in defect position had obvious differences,and the Cr,O,C elements were mainly enriched in the steel pit after defects dropped out.The results show that the edge peeling defect of medium and heavy plate for 2205 duplex stainless steel is relative to columnar crystal and force status at the edge of continuous casting billet.Because of the low strength and the reduction of area of columnar crystal, the crystal boundary of the columnar crystal which located at the edge of the continuous casting billet was engendered the microcrack under the effect of the tensile stress during the spreading procedure of the medium and heavy plate. In especial, the microcrack easily engendered at the combination position of the α and γ phase, then the crack extended in the subsequent rolling procedure. Meanwhile, with the penetration of the deformation, the metal at the upper and lower corner positions of the side section for billet flowed to the core of the steel plate gradually under the effect of the in-homogeneous deformation during the spreading rolling procedure of the continuous casting billet, then separately moved to the upper and lower surfaces of the billet, and the oxidized metal of the corner position entered into the matrix of the steel plate. The microcrack was extended gradually during the subsequent rolling procedure under the combined action of the two factors, and formed the defect.

Funds：

任培东（1972-），男，硕士，正高级工程师 E-mail：renpeidong@jiugang.com 通讯作者：张有余（1970-），男，硕士，正高级工程师 E-mail：zhangyouyu@jiugang.com

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