Manufacturing process
Raw material selection: carbon steel, stainless steel, alloy steel and other materials are generally selected, and the quality and performance of raw materials directly affect the quality and service life of flat welded flanges.
Forging or casting: blank manufacturing methods are mainly forging and casting. The forging process can improve the mechanical properties of the material and make the flange have better strength and toughness, but the cost is relatively high. The casting process has high production efficiency and low cost, but the internal quality of the product is relatively poor.
Machining: After the blank is forged or cast, it is necessary to carry out a series of machining such as turning, milling, drilling, etc., to achieve the specified size and accuracy requirements, and strictly control the process parameters during the processing to ensure the dimensional accuracy and surface quality of the flange.
Heat treatment: In order to improve the mechanical properties and structure of the flat welded flange, improve its corrosion resistance and fatigue strength, it is usually necessary to carry out annealing, normalizing, quenching and tempering heat treatment.
Pressure grade: Common pressure grades are PN0.25MPa, PN0.6MPa, PN1.0MPa, PN1.6MPa, PN2.5MPa, PN4.0MPa, etc., which should be selected according to the working pressure, medium characteristics and temperature of the pipeline system.
Size specifications: According to the nominal diameter (DN) and nominal pressure (PN) of the pipeline to determine, the national standard for its size DN5000 below the plate can be produced