What are the factors that affect the quality of American Standard seamless tubes?
1. Temperature
Temperature is the main factor affecting the quality of American Standard seamless steel tubes. First of all, the uniformity of the heating temperature of the tube blank directly affects the wall thickness uniformity and inner surface quality of the perforated capillary, which in turn affects the wall thickness quality of the product. Secondly, the temperature and uniformity of the steel pipe during rolling (especially the final rolling temperature) are related to the mechanical properties, dimensional accuracy and surface quality of the product delivered in the hot-rolled state, especially when the billet or billet is overheated or even When overheated, it will cause waste. Therefore, in the production process of hot-rolled seamless pipes, heating and controlling the deformation temperature in strict accordance with the process requirements must be done first.
2. Tool quality
The quality of the tool is good or bad, stable or not, which is directly related to whether the dimensional accuracy, surface quality and tool consumption of the product can be effectively controlled; the quality of the surface treatment (chrome plating) of the mandrel is affected. The inner surface of the steel pipe, the second is to affect the mandrel consumption and production costs.
3. Process adjustment
The quality of process adjustment and work quality mainly affects the geometry and appearance quality of steel pipes.
For example, the adjustment of the piercing 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 accuracy and straightness of the product. In addition, the process adjustment also affects whether the rolling process can be carried out normally.
4. Process cooling and lubrication
The cooling quality of the perforated plug and roll not only affects its life, but also affects 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 American Standard seamless steel pipe; it also affects the load during rolling.
5. Removal and control of sundries on the surface of rolled pieces
This refers to the timely and effective removal of iron oxide scale on the inner and outer surfaces of capillary and barren pipes and the control of re-oxidation before rolling deformation. Nitrogen blowing and borax blasting treatment of the inner hole of the capillary tube, high-pressure water descaling at the inlet of the fixed (reduced) diameter can effectively improve and improve the quality of the inner and outer surfaces.