这个阶段的产品是横断面较小的半成品，如板坯、大钢坯、小方坯等。这些半成品适合于进一步轧制。
In this stage semifinished products with smaller cross sections are produced, such as slab, bloom or billet, which are suitable for further rolling.
由于高温及复杂光照的干扰等成像环境的影响，钢坯端面字符自动识别存在很多困难，其实时自动识别难度大。
Owing to the effect of the high temperature, complex illumination and bad-imaging environment, there are a lot of difficulties in real-time automatic character recognition at ends of steel billet.
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