燕山早期运动主要为NW-SE向的挤压褶皱作用，断裂带走向开始弯曲变形；
Near NW-SE compressive folding occurred in early Yanshan orogeny, when it began to buckle.
该区的构造演化经历了强烈断陷期、断坳转换期、坳陷期和挤压褶皱期4个演化阶段。
The structure evolution process experienced 4 stages: intensively faulting period, the period transformed from fault depression to sag, depression period and compaction fold period.
轧制过程中各道次的不均匀变形和挤压褶皱造成了圆钢表面的长条形缺陷，而表面和近表面缺陷是造成冷顶锻开裂的主要原因。
Uneven deformation and extrusion drape in the different pass when rolling cause long strip defect on the surface. Defects on the surface and near surface are the main cause for cold heading to craze.
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