Main factors affecting the quality of steel pipe and quality control

　　The influencing factors on the quality of the steel pipe has two categories: steel and rolling process factors.Here is only the factors on rolling process are discussed. The main influencing factors are: temperature, process adjustment, tool quality, process cooling and lubrication, rolled piece surface impurities removal and control.

　　(1) temperatureThe temperature is the most important factor affecting the quality of steel pipe. First of all, the tube billet heating temperature uniformity of direct impact perforation capillary wall thickness and inside surface quality, which in turn affect the quality of the product's wall thickness. Second, when rolling of steel tube temperature uniformity and (especially) finishing temperature and in hot rolled state delivery of product mechanical properties, such as outside diameter size accuracy and surface quality, especially when the billet or tube billet overheat even burnt, cause waste. Therefore, in the process of hot rolled seamless steel tube production, in strict accordance with the technical requirements deformation temperature heating and control is to do a good job of must first.

　　(2) process adjustmentProcess adjustment and job quality mainly affect the quality of steel tube's geometry and appearance.Such as the punch and the adjustment of the mill affect product wall thickness accuracy, the adjustment of the sizing mill is related to the product diameter precision and straight. And, it can affect the process of rolling process adjustment on the rails.

　　(3) the quality of toolsTool quality good and bad, stable or not, is directly related to realization of dimensional accuracy and surface quality of products and tools cost effective control; Plug the quality situation of surface treatment (chrome plated), one is the effect of steel tube inner surface affect the mandrel consumption and production cost.

　　(4) the process of cooling and lubricationPiercing mandrels, roll cooling both affect the life quality, and impact on finished products inside and outside surface quality control. Quality of cooling and lubrication of the mandrel, first of all affect the quality of steel pipe's inner surface, wall thickness accuracy and mandrel consumption; At the same time, it will affect when rolling load.

　　(5) the workpiece surface impurities removal and controlThis refers to the rolling deformation before iron oxide on the surface of a capillary, arakawa tube inside and outside of timely, effectively remove and control of the oxidation again. For wool tube hole blowing nitrogen and borax spraying processing, steel pipe and fixed diameter (reduction) at the entrance of high pressure water descaling can effectively improve and improve the quality of interior and exterior.All in all, there are a variety of factors affecting the quality of steel pipe, and is often a combination of various factors. Therefore, must be the main influence factors for effective control. Only in this way can control the quality of the steel tube and produce a high dimensional accuracy, good performance and quality of the thermal expansion of steel pipe.

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