廠傢解讀冷拔鋼管的表面會不會發硬

冷拔鋼管金屬在冷加工後，由於晶粒被壓扁、拉長（見圖1），晶格歪扭、晶粒變形（見圖2），使冷拔鋼管金屬的塑性降低、強度和硬度增高，把這種現象叫做加工硬化。加工硬化具有非常重要的實際意義，它是強化金屬（提高強度）的方法之一，對純金屬以及不能用熱處理方法強化的金屬來說尤其重要。例如坦克履帶、礦石破碎機襯板之所以具有高耐磨性，冷彈簧在卷制後之所以能具有高彈性，冷拔鋼管之所以具有高強度等，都是加工硬化的結果。另外，加工硬化也給金屬的冷加工生產，創造瞭條件。因為金屬在冷加工過程中硬化到一定程度就不能再繼續加工，所以在一定條件下不致因變形而發生斷裂。
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 st印花地坪rengthening 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 h环氧地坪ardening. 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. 加工硬化提高瞭變形抗力，給冷拔鋼管金屬的繼續加工帶來困難。為瞭消除加工硬化必須在加工過程中進行專門的熱處理，冷拔鋼管金屬經再結晶軟化之後才能繼續進行加工。
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.