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厂家解读冷拔钢管的表面会不会发硬

2018-12-05 14:07:00 无锡科达脚手架厂 阅读

冷拔钢管金属在冷加工后,由于晶粒被压扁、拉长(见图1),晶格歪扭、晶粒变形(见图2),使冷拔钢管金属的塑性降低、强度和硬度增高,把这种现象叫做加工硬化。加工硬化具有非常重要的实际意义,它是强化金属(提高强度)的方法之一,对纯金属以及不能用热处理方法强化的金属来说尤其重要。例如坦克履带、矿石破碎机衬板之所以具有高耐磨性,冷弹簧在卷制后之所以能具有高弹性,冷拔钢管之所以具有高强度等,都是加工硬化的结果。另外,加工硬化也给金属的冷加工生产,创造了条件。因为金属在冷加工过程中硬化到一定程度就不能再继续加工,所以在一定条件下不致因变形而发生断裂。

After cold-drawn steel pipe is processed, the plasticity, strength and hardness of cold-drawn steel pipe metal are reduced and increased due to the flattening and elongation of grains (see Fig. 1), lattice distortion and grain deformation (see Fig. 2). This phenomenon is called work hardening. Work hardening has very important practical significance. It is one of the methods of strengthening metals (increasing strength), especially for pure metals and metals that can not be strengthened by heat treatment. For example, the high wear resistance of tank track and lining plate of ore crusher, the high elasticity of cold spring after winding and the high strength of cold drawn steel pipe are all the results of work hardening. In addition, work hardening also creates conditions for cold working production of metals. Because the metal can harden to a certain degree in the cold working process and can not continue processing, under certain conditions, it will not cause fracture due to deformation. 加工硬化提高了变形抗力,给冷拔钢管金属的继续加工带来困难。为了消除加工硬化必须在加工过程中进行专门的热处理,冷拔钢管金属经再结晶软化之后才能继续进行加工。

Work hardening improves the deformation resistance and brings difficulties to the continuous processing of cold-drawn steel pipe metals. In order to eliminate work hardening, special heat treatment must be carried out in the process of processing, and the cold-drawn steel tube metal can continue to be processed only after recrystallization and softening.



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