Cold drawing of cold-drawn steel refers to the application of tensile force to the material under normal temperature conditions, which exceeds the yield point of the original steel and causes plastic deformation, thereby achieving the expected processing purpose. And hot-rolled steel is hot-rolled, which is rolled at high temperatures, so it has no plastic deformation. Moreover, in terms of strength, it is not very high. So, these are the differences.

冷拉钢的硬度范围，如果未经特殊处理，则范围为HRC15-220。而冷拉扁钢在冷拉型材中，与冷轧扁钢相比，存在一些差异，主要表现在，前者是用于拉伸变形，后者是用于轧制，是压力变形。在其他方面，没有区别。

The hardness range of cold drawn steel, if not specially treated, is HRC15-220. Compared with cold rolled flat steel, cold drawn flat steel has some differences in cold drawn profiles, mainly manifested in that the former is used for tensile deformation, while the latter is used for rolling and pressure deformation. In other aspects, there is no difference.

这是因为冷拉后的钢材，与热轧相比，没有屈服过程，但在强度上，有了很大的提高，所以可以作为预应力构件，如预应力楼板。然而，它也有缺点，至于具体的，将在以后加以解释。因为这不是问题的一部分。

This is because the cold-drawn steel has no yield process compared to hot-rolled steel, but has a significant improvement in strength, so it can be used as a prestressed component, such as a prestressed floor slab. However, it also has its drawbacks, and specific details will be explained in the future. Because this is not part of the problem.

冷拉型钢的冷拉工艺是在室温下进行的。此外，通过这种操作，材料也可以进行塑性变形，从而提高其屈服点强度。冷拉型材中的冷拉圆钢可以弯曲，因为它不会超过材料的强度。所以问题二的答案是肯定的

The cold drawing process of cold drawn steel is carried out at room temperature. In addition, through this operation, the material can also undergo plastic deformation, thereby improving its yield point strength. Cold drawn round steel in cold drawn profiles can be bent because it does not exceed the strength of the material. So the answer to question two is yes

在冷拉型材中，如果使用的材料不合格或质量不合格，并且含有杂质或过多杂质。然后，如果进行加工，所加工的冷拉钢会增加材料硬度，但容易出现开裂等问题。

In cold drawn profiles, if the materials used are substandard or of substandard quality, and contain impurities or excessive impurities. Then, if processed, the cold drawn steel processed will increase the material hardness, but it is prone to cracking and other problems.

这是因为冷拉钢的表面在冷拉过程中会形成马氏体，再加上塑性变形，导致位错线密度增加，然后由于相互制约，限制其进一步运动。反过来，冷拉钢的表面硬度增加。

This is because the surface of the cold drawn steel will form martensite during the cold drawing process, coupled with plastic deformation, which will lead to the increase of dislocation line density, and then restrict its further movement due to mutual constraints. Conversely, the surface hardness of cold drawn steel increases.

关于冷拉钢材，这些可以说是非常基础的，但也有一定的实用性，所以我们应该及时掌握，并充分利用它们，使产品能够有良好的使用效果。此外，它还将提高其利用效率。

Regarding cold-drawn steel, these can be said to be very basic, but they also have a certain degree of practicality, so we should grasp them in a timely manner and make full use of them, so that the product can have good use effects. In addition, it will also improve its utilization efficiency.

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