In many of today’s seamless steel pipe mills, production and sales are mainly centered on cold-drawn and hot-rolled seamless steel pipes, and the two production processes are also different. Therefore, in the production process of these two types of seamless steel tubes, the production process of cold drawn seamless steel tubes is rather complicated. In the cold-drawn seamless steel tube, firstly, continuous rolling is performed on the tube blank, and the sizing test can only be performed after continuous rolling. At this time, the surface of the tube blank does not have any crack response before the next process can be performed.
Then, after the crack is responded to, the cutting is performed. The length of the cutting is about one meter, and the cutting process will enter the annealing process. In the annealing, one of the key is to pickle, so when pickling, workers should pay attention to their own safety issues. When pickling, pay attention to the foaming condition on the surface of the steel tube. If the bubbles play too much, then the quality of the steel tube cannot meet the requirements. In contrast, hot rolling is much simpler. It is only necessary to carry out the heat treatment in the hot-rolled state so that it can be delivered. Therefore, the process is much simpler.
However, when hot rolling is made, it must be carefully selected by the staff to be placed in the warehouse. Therefore, these two types of seamless steel pipes have basically become the major sales and production of many seamless steel pipe plants. Not only different in the process, these two kinds of seamless steel pipe are also apparently different in appearance. In contrast, the length of the cold-drawn seamless steel pipe is even shorter, and the wall thickness problem is also wider than the hot-rolled seamless steel pipe 16Mn seamless steel pipe.
The general purpose seamless steel pipe is rolled by common carbon structural steel, low alloy structural steel or alloy structural steel, and the output is the most. The strength is slightly higher than that of No. 15 steel, and it is rarely quenched and has no temper brittleness. The cold-deformation-plastic company sells high-quality seamless steel pipes for sales in all provinces and regions except Hainan and Tibet. While continuously improving the competitiveness of our customers through services, we have also won market recognition for ourselves. All kinds of seamless steel tubes and alloys produced by major steel plants have high tube properties, and are generally used for bending, calendering, crimping, and hammer arching.
Arc welding and contact welding have good welding performance, and they have small thickness and strict shape requirements during gas welding. Cracks tend to occur on parts with complex shapes. Machinability Cold drawing or normalizing is better than annealing. It is generally used for manufacturing with low stress and high toughness requirements. Applicable to engineering, coal mine, textile pipelines or structural parts mainly used for conveying fluids. Seamless casing made of such steel is widely used in hydraulic props, high pressure gas cylinders, high pressure boilers, fertilizer equipment, petroleum cracking, and automobile semi Bushings, diesel engines, hydraulic pipe fittings, etc. are used for surface quenching or high frequency quenching. Therefore, it differs depending on the chemical composition (mainly carbon content), heat treatment process, and use. But on the surface, cold drawing will be brighter and smoother.