The technological properties of reinforcing bars include many items. Different requests can be made according to the characteristics of different products, such as ordinary reinforcing bars requesting to stop bending and reverse bending (reverse bending) experiments, and some prestressing steel requesting to stop repeated bending, changing and winding experiments.

　　一切这些实验的方式不同水平地模仿了资料在实践运用时可能触及的工艺加工方式，如普通钢筋需求弯钩或弯曲成型，预应力钢丝有时需缠绕等，而其目的就是考核资料对这些特定塑性变形的极限接受才能，因此工艺性能也是对资料的塑性请求，且与上述延性（伸长率）请求是相通的，普通来说伸长率大的钢材，其工艺性能也好。

　　All these experiments simulate the processing methods that the data may touch upon in practice, such as bending or bending forming of ordinary steel bar, winding of prestressing steel wire, etc. The purpose of these experiments is to check the data's ability to accept the limit of these specific plastic deformation. Therefore, the process performance is also a plastic request for the data and is related to the ductility (extension) mentioned above. Length) Requests are common. Generally speaking, steel with high elongation has good technological properties.

　　但是与拉伸时的单向受力状态相比，工艺性能实验的受力状态就复杂得多，试样变形类型与大小则各向（轴向、径向）不同，钢材的组织构造、晶粒大小、有害剩余元素含量特别是内部和外表任何影响连续变形的缺陷如裂纹、夹杂等都可能影响和招致实验不经过。所以在某种意义上，关于考核钢材的质量，能够说工艺性能实验更为严厉。

　　However, compared with the unidirectional stress state under tension, the stress state of the process performance test is much more complex. The deformation type of the specimen is different from that of the specimen in all directions (axial and radial). The structure, grain size, harmful residual element content of the steel, especially any defects, such as cracks and inclusions, which affect the continuous deformation both inside and outside, may affect and cause the experiment not to pass through. Therefore, in a sense, it can be said that the process performance test is more rigorous to assess the quality of steel.

　　另外钢筋的反向弯曲实验实质上是一项应变时效敏理性实验这是由于钢水中普通都含有一定数量的游离氮（N），也称剩余氮，含量过高时，可招致钢材经塑性变形后在室温下脆化。

　　In addition, the reverse bending experiment of steel bar is essentially a strain-aging sensitivity experiment, which is due to the fact that the steel usually contains a certain amount of free nitrogen (N), also known as residual nitrogen. When the content is too high, the steel can be brittled at room temperature after plastic deformation.

　　由于钢筋常常需弯曲成型以后运用，曾经产生了塑性变形，假如材性变脆，构造就不能接受使钢筋再产生塑性变形的外加荷载（如地震），所以目前国内外都将反弯实验作为一项重要技术请求列入钢筋规范，同时对钢的氮含量予以限制（不超越0.012%）。

　　Because steel bars often need to be used after bending and forming, plastic deformation has been produced. If the material is brittle, the structure can not accept the additional load (such as earthquake) which causes plastic deformation of steel bars. At present, the reverse bending experiment is included in the steel bar code as an important technical request at home and abroad, and the nitrogen content of steel is limited (not exceeding 0.012%).

　　研讨标明，用于钢的微合金化的一些元素如钒、钛、铌等，特别是钒与氮有极好的亲和力，钢中参加钒可有效分离自在氮，钒与氮的分离还能进一步加强钒对钢的强化效果，因而有些规范也注明“假如有足够的与氮分离的元素存在氮含量能够高出规范规则”。

　　The study shows that some elements used in microalloying of steel, such as vanadium, titanium, niobium, etc., especially vanadium and nitrogen have excellent affinity. Vanadium in steel can effectively separate free nitrogen. The separation of vanadium and nitrogen can further enhance the strengthening effect of vanadium on steel. Therefore, some codes also indicate that "if there are enough elements separated from nitrogen, the nitrogen content can be higher than the norms".