钢坯质量的控制详解.doc

连铸坯质量的控制 武汉科技大学---冶金技术系张延虎 目 录 摘 要 ....................................................... ........................1 一、连铸坯纯净度与产品质量 ..................................... ..2 1、纯净度与质量的关系 ............................................... ..2 2、提高纯净度的措施 ............................................... ......3 二、连铸坯的表面质量 .......................................... .........5 1、表面裂纹 .............................................. .......................5 1.1纵向裂纹....................................................................5 1.2角部裂纹....................................................................6 1.3槽向裂纹....................................................................7 1.4星状裂纹....................................................................8 2、表面夹渣 .............................................. .......................9 3、皮下气泡与气孔 ....................................................... ..10 三、连铸坯内部质量 ............................................ ...........11 1、中心偏析 ............................................. ........................11 2、中心疏松 .................................................................... .12 3、内部裂纹 ............................................. ........................13 3.1皮下裂纹..................................................................13 3.2矫直裂纹..................................................................13 3.3压下裂纹..................................................................13 3.4中心裂纹..................................................................14 3.5中心星状裂纹..........................................................14 四、连铸坯的外观形状 ............................................. .....15 1、鼓肚变形 ............................................. .......................15 2、菱形变形 .....................................................................16 3、圆铸坯变形 ........................................................... .....17 结论 .......................................