首先，热轧螺纹钢指的就是钢筋，不过，热轧螺纹钢说法有欠缺，正确的说法是热轧钢筋，而螺纹钢是热轧钢筋的俗称。那么热轧与冷轧有什么区别呢？简单来说，就是把钢材加热后控制在再结晶温度以上进行轧制加工的工艺称为热轧。而在再结晶温度以下，包括常温下进行轧制加工的工艺称为冷轧。
First of all, hot-rolled rebar refers to the steel bar, but there is a lack of hot rolled thread steel, the correct saying is hot rolled steel, while the rebar is commonly known as hot-rolled steel. So what's the difference between hot rolling and cold rolling? Simply speaking, the process of rolling steel after controlling the recrystallization temperature is called hot rolling. The rolling process at room temperature, which is below the recrystallization temperature, is called cold rolling.

而热轧钢筋也就是我们普通所谓的高线、螺纹钢。而冷轧钢筋现在市场上已经几乎见不到了。因为设计上已经不在使用这种钢筋了。其实冷轧钢筋多为钢筋的二次加工，尤其是作为螺纹钢来说，一眼便可以看出来。因为它多用8个或者10个的光圆钢筋，在其表面用冷轧的方式轧出三面肋，加工粗糙，一般没有什么发黑等处理，这是以前为了节省钢筋用量采用的一种方法，加工出来的钢筋强度是高，但是脆性差，伸长率极低，且没有明显的屈服点，以前常被用在板上，而现在可没有人敢用这个了。
And hot rolled rebar is what we call wire rod and thread steel. And cold rolled steel bars are barely available in the market. Because the design is no longer used in this steel bar. In fact, cold-rolled steel bars are mostly the two processing, especially as thread steel, can be seen at one glance. Because it used round bars of 8 or 10, on the surface of cold rolled ribbed surface three way, rough machining, etc. What is generally not black, it is used in order to save a method using the reinforcement ratio, strength of steel processing is high, but the difference is very brittle, elongation low, and no obvious yield point, is often used in, and now no one dares to use this.
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