表面龟裂一般指在铸坯表面的星状裂纹。该缺陷一般覆盖在氧化铁皮下。表面龟裂的铸坯在轧制时，裂纹会扩展。结晶器内的凝壳与铜管内壁摩擦，把铜磨削下来，铜渗入铸坯表层，尤其沿晶界优先扩散渗入，使铸坯的表层的热态强度恶化而导致龟裂。 发生表面龟裂，更换已毛糙的结晶器是唯一的选择。减少铸坯与结晶器内壁的摩擦阻力（诸如：结晶器安装严格对中；结晶器铜管内表面的足够光洁度；结晶器铜管内表面的镀层处理等）是防止再次发生龟裂的方法。
可防止和降低个别干旱地区因木材缩水所引起木材末端干裂和表面龟裂等现象。
Arid areas to prevent and reduce the individual caused by wood shrinkage cracking and surface cracking of wood at the end and so on.
该研究证明，狼蛛在龟裂不均的墙面爬行时，经常向蜘蛛侠那样使用蛛丝牢牢地粘附在表面，即使表面摇晃，它们也能紧紧地贴在那里。
So tarantulas often use silk much like Spider-Man does when wall-crawling—to stick to surfaces and stay firmly attached, even when the ground is shaky, the research confirmed.
旧漆膜出现龟裂、起泡及剥落时，应将其彻底除去，修补打磨后，将表面清理干净。
The old paint film cracking occurs, bubbling and peeling, it should be completely removed, repair polished, clean the surface.
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