Cu is known to affect the edge cracking characteristics of austenitic stainless steel as it causes embrittlement. The hot rolling test of four kinds of austenitic stainless steel with different copper content (0, 2.42, 3.60 and 4.35 wt.%) was carried out to examine the effect of hot rolling cracks on steel containing different copper contents. The evolution of crack and microstructure was analyzed using the scanning electron microscope, energy-dispersive spectrometer, electron back scattered diffraction and transmission electron microscope. Experimental results showed an upward trend in edge cracking degree when Cu content was 4.35%, and the crack extended from the edge of the steel plate to the middle by about 14 mm. Besides, severe oxidation was observed inside the crack by fractography. With the increase in copper content at 1250 °C, the content of {110}<112> brass and {112}<111> copper textures decreased. When the content of copper was 4.35%, the decrease was most significant, and {112}<111> copper texture content decreased to only 0.5%. Generally, the textures of 2.42%Cu and 3.60%Cu 304L steel changed little, while a large change in the texture of 4.35%Cu 304L steel was observed. To conclude, the increase in rolling temperature can prevent edge crack and its propagation effectively.

众所周知，Cu 会影响奥氏体不锈钢的边缘开裂特性，因为它会导致脆化。对四种不同铜含量（0、2.42、3.60和4.35wt.%）的奥氏体不锈钢进行热轧试验，研究热轧裂纹对不同铜含量钢的影响。使用扫描电子显微镜、能谱仪、电子背散射衍射和透射电子显微镜分析裂纹和微观结构的演变。实验结果表明，当Cu含量为4.35%时，边缘开裂程度呈上升趋势，裂纹从钢板边缘向中部延伸约14 mm。此外，通过断口分析观察到裂纹内部严重氧化。随着1250℃时铜含量的增加，{110}<112>黄铜和{112}<111>铜织构的含量减少。当铜含量为4.35%时，下降最为显着，{112}<111>铜织构含量下降至仅0.5%。一般来说，2.42%Cu和3.60%Cu 304L钢的织构变化不大，而4.35%Cu 304L钢的织构变化较大。综上所述，提高轧制温度可以有效地防止边缘裂纹及其扩展。