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.

冷拉鋼的硬度范圍，如果未經特殊處理，則范圍為HRC15-220。而冷拉扁鋼在冷拉型材中，與冷軋扁鋼相比，存在一些差異，主要表現在，前者是用于拉伸變形，后者是用于軋制，是壓力變形。在其他方面，沒有區別。

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.

這是因為冷拉后的鋼材，與熱軋相比，沒有屈服過程，但在強度上，有了很大的提高，所以可以作為預應力構件，如預應力樓板。然而，它也有缺點，至于具體的，將在以后加以解釋。因為這不是問題的一部分。

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.

冷拉型鋼的冷拉工藝是在室溫下進行的。此外，通過這種操作，材料也可以進行塑性變形，從而提高其屈服點強度。冷拉型材中的冷拉圓鋼可以彎曲，因為它不會超過材料的強度。所以問題二的答案是肯定的

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質量不合格，并且含有雜質或過多雜質。然后，如果進行加工，所加工的冷拉鋼會增加材料硬度，但容易出現開裂等問題。

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.

這是因為冷拉鋼的表面在冷拉過程中會形成馬氏體，再加上塑性變形，導致位錯線密度增加，然后由于相互制約，限制其進一步運動。反過來，冷拉鋼的表面硬度增加。

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.

關于冷拉鋼材，這些可以說是非常基礎的，但也有一定的實用性，所以我們應該及時掌握，并充分利用它們，使產品能夠有良好的使用效果。此外，它還將提高其利用效率。

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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