1. hot rolled section steel 
   热轧型钢
2. hot rolled steel bar for concrete reinforcement 
   热轧钢筋
3. cold rolled section steel 
   冷弯型钢
4. I have seen in some colour pictures that the steel being rolled is red and it looks quite hot. Why? 
   我在一些照片上看到正被轧制的钢都是红的，而且它看上去挺热，这是怎么回事?
5. I have seen in some colour picture that the steel is rolled being red and it looks quite hot. Why? 
   我在一些照片上看到正被轧制的钢都是红的，而且它看上去挺热，这是怎么回事？

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• 1. 热轧软钢
  反义词 hot-rolled mild steel...热轧软钢 malleable mild steel...韧性软钢,韧性低碳钢 meek and mild
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