Main Factors Affecting the Quality of Seamless Steel Tubes and Quality Control

There are two main factors affecting the quality of seamless steel pipe: steel and rolling process factors. Only the factors of the rolling process are discussed here. The main influencing factors are temperature, process adjustment, tool quality, process cooling and lubrication, and removal and control of debris on the surface of rolled parts.

1. TemperatureTemperature is the most important factor affecting the quality of seamless steel tubes. First, the uniformity of the heating temperature of the tube blank directly affects the uniform wall thickness of the perforated capillary tube and the quality of the inner surface, which in turn affects the wall thickness quality of the product. Secondly, the temperature and uniformity of the seamless steel pipe during rolling (especially the finish rolling temperature) and the mechanical properties, outer diameter and other dimensional accuracy and surface quality of the products delivered in the hot rolled state.The amount is related, especially when the billet or tube billet is overheated or even burnt, which will cause waste. Therefore, in the production process of hot-rolled seamless pipes, it is necessary to first do a good job to heat and control the deformation temperature in strict accordance with the process requirements.
2. Process adjustmentProcess adjustment and quality of work mainly affect the geometry and appearance quality of seamless steel tubes. For example, the adjustment of the punching machine and the rolling mill affects the wall thickness accuracy of the product, and the adjustment of the sizing machine is related to the outer diameter precision and straightness of the product. Moreover, the process adjustment also affects whether the rolling process can proceed normally.
3. Tool qualityWhether the quality of the tool is good or bad, whether it is stable or not, is directly related to whether it can achieve effective control of the dimensional accuracy, surface quality and tool consumption of the product; the quality condition of the surface treatment (chrome plating) of the mandrel, one affects the seamless steel pipe. The surface, the second is to affect the mandrel consumption and production costs.
4. Process cooling and lubricationThe cooling quality of the piercing head and the roll affects both the life and the quality control of the inner and outer surfaces of the finished product. The cooling and lubrication quality of the mandrel first affects the inner surface quality, wall thickness accuracy and mandrel consumption of the seamless steel pipe; it also affects the load during rolling.
5. Removal and control of debris on the surface of rolled productsThis refers to the timely and effective removal of the iron oxide scale on the inner and outer surfaces of the capillary tube and the waste tube before the rolling deformation and the control of the reoxidation. The nitrogen blowing and boring treatment of the inner tube of the capillary tube, the high-pressure water descaling at the inlet of the seamless steel tube and the fixed (reduced) diameter can effectively improve and improve the quality of the inner and outer surfaces.

In short, the factors affecting the quality of seamless steel pipes are multifaceted and often combined with various factors. Therefore, the above main influencing factors must be effectively controlled. Only in this way can we control the quality of seamless steel tubes and produce thermally expanded seamless steel tubes with high dimensional accuracy, good performance and excellent quality.

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