Rolling of Large Diameter Fluid Steel Pipe and Axial Direction of Vertical Steel Pipe

The segments open until all the segments touch the inner wall of the steel tube. The steel pipe was initially rounded. The position of the past segment of the segment begins to decrease the speed of movement until it reaches the desired position, which is the inner circumference of the waste pipe of the quality requirement. Moreover, the defect can only be quantitatively analyzed. The magnetic flaw detection of the straight seam welding can only find the defects of the outer surface and the near surface of the magnetic Q235B straight seam welded pipe. The nature and depth of the defect can only be estimated empirically. The magnetic test is the magnetic flux method, the magnetic induction method and the magnetic recording method, which can be divided into the magnetic powder method, the magnetic induction method and the magnetic recording method by using the magnetic flux magnetization of the ferromagnetic Q235B straight seam welded pipe to find the defects. The magnetic powder method is the most widely used. The penetration test of spiral welding is to use physical properties such as the permeability of certain liquids to find and display defects, including coloring test and fluorescence detection, which can be used to check the defects of ferromagnetic and non-ferromagnetic data.

Refers to a welded steel pipe with a hot dip or galvanized layer on the outer surface of a large diameter fluid steel pipe. Zinc plating can increase the corrosion resistance of steel pipes, and galvanizing of large diameter steel pipes is also called large diameter galvanized steel pipes. Extended service life. Galvanized pipes are widely used, in addition to pipelines for general low-pressure fluids such as water, gas, oil, etc., and also used as oil well pipes and oil pipes in the petroleum industry, especially in offshore oil fields, oil heaters for chemical coking equipment, and condensation. The cooler, the tube for the coal-distilled oil-washing exchanger, the bridge tube pile, the support tube for the mine tunnel, and the like.

A hydraulic processing method that uses hydraulic or mechanical means to force the steel pipe to expand radially outward from the inner wall of the steel pipe. The steel plate is first pressed into a U shape in the forming mold, and the diameter expansion of the mechanical expansion process of the large diameter steel pipe is one of the metallurgical terms. It is pressed into an O shape and then subjected to internal and external submerged arc welding. After welding, the diameter is usually expanded at the end or the full length (Expand is called UOE welded pipe, and the UO welded pipe is not expanded. The steel plate is rolled and bent (RollBend then For internal and external submerged arc welding, the diameter after welding is RBE welded pipe or RB welded pipe without expansion. The steel plate is formed in the order of J-C type-O type, and the diameter is expanded to JCOE welded pipe or JCO is not expanded. Welded pipe. In the above LSA W welded pipe, the general UOE is used. The radius of each point in the inner pipe of the steel pipe is almost the same. The diameter expansion process of the large diameter steel pipe is firstly the initial rounding stage.

Since the rolling direction of the spiral welded coil is not the direction of the vertical steel pipe axis (the pinching depends on the helix angle of the steel pipe), the rolling direction of the straight seam welded steel plate is perpendicular to the axial direction of the steel pipe, and the alloy content (carbon equivalent) of the coiled plate is often steel plates lower than similar grades. Therefore, the spiral welding material has better crack resistance than straight seam welding. This also improves the weldability of the spiral weld of large diameter steel pipes. Until the required position is reached, the second stage of the expansion process of the large diameter steel pipe is the rebound compensation stage. The fan-shaped block starts to move further at a low speed in the 2-stage position. This position is the inner circumferential position of the steel pipe before the rebound of the process design. The fan-shaped block remains in the inner circumferential position of the steel pipe for a certain period of time before the rebound, which is the pressure-stabilizing stage required by the equipment and the expansion process. Finally, the unloading regression phase of the expansion process of large diameter steel pipes. The segment is rapidly retracted from the inner circumferential position of the steel pipe before the rebound until it reaches the position of the initial expansion, which is the minimum contraction diameter of the segment required by the expansion process.

It has the metallurgical process capability to obtain high quality pipeline steel. For example, the straight seam welding of large-diameter steel pipes is produced by steel plates, and the spiral welding of large-diameter steel pipes is a series of advantages in the rolling process of hot-rolled steel strips produced by hot rolled coils. A water cooling system is installed on the output gantry to accelerate cooling, which allows the use of low alloying components to achieve special strength levels and low temperature toughness, thereby improving the weldability of the steel. But this system is basically not available in steel plate production plants.

It's Daisy from China.I feel very happy to serve you so visit to my article.