Flat-welded flanges in forging features

When flat-welded flanges are forged at low temperature, the size of the forging piece changes very little.Forging under 700 ℃, and less scale formation, and surface decarburization phenomenon.Therefore, as long as the deformation can be within the range of forming energy, cold forging can easily obtain good dimensional accuracy and surface finish.As long as the good control of temperature and lubrication cooling, the temperature under 700 ℃ forging can also achieve good accuracy.When hot forging, because the deformation energy and deformation resistance are very small, we can forge the flat-welded flange with complex shape.In order to get high dimensional precision forging, can be in 900-1000 ℃ temperature field using hot forging processing.In addition, attention should be paid to improving the working environment of hot forging.The life of the forging die (2-5,000 hot forging, 10,000 to 20,000 warm forging and 20,000 to 50,000 cold forging) is relatively short compared with forging in other temperature fields, but it has great freedom and low cost.

Ordinary flat welding flange rubber gasket is suitable for the occasion of temperature below 120 ℃;Asbestos rubber gasket suitable for vapor temperature below 450 ℃, the oil temperature is below 350 ℃, pressure is lower than 5 mpa, for general corrosive medium, the most commonly used is acid-proof asbestos board.In high pressure equipment and pipelines, metal gaskets in the form of lenses or other shapes made of copper, aluminum, no. 10 steel, stainless steel, etc.The contact width between the high pressure gasket and the sealing surface is very narrow (line contact).