The heat treatment ways of fittings and flanges
After the metal is heated, insulated and cooled, the properties of the metal will change differently. After heating, the performance of the same flange pipe fitting will also be different. For example, stainless steel flanges have superior performance. The heating and cooling effects of pipe fittings are obtained. The heating process of stainless steel flange pipe fittings is one of the important parameters in the heat treatment process.
Heat Treatment Flange Production
In the heat treatment process of flange pipe fittings, annealing cooling speed is usually the slowest, normalizing cooling speed is faster, and quenching cooling speed is faster. However, due to different steel grades, there are different requirements. For example, air hardened steel can be hardened at the same cooling rate as normalizing. These processes of flanged pipes are connected to each other without interruption. When the metal is heated, the workpiece is exposed to the air, and the flange pipe fittings are often oxidized. Decarburization (i.e. reducing the carbon content on the surface of steel parts), which has a very adverse impact on the surface performance of parts after heat treatment. The flange pipe metal should usually be in a controlled atmosphere or protective atmosphere. Molten salt can neutralize heat in vacuum and can also be used for protection and heating by coating or packaging.
In addition, the heating temperature of flange pipe fittings is one of the important process parameters of heat treatment process. The selection and control of heating temperature is the main problem to ensure the quality of heat treatment. The heating temperature varies with the metal material to be treated and the heat treatment target, but it is usually heated to a temperature higher than the phase transformation temperature to obtain a high-temperature structure. Heating is one of the important processes of heat treatment.
There are many heating methods for metal heat treatment of flange fittings. First, charcoal and coal are used as heat sources, and then liquid and gas fuels are used. Nowadays, many manufacturers are using electrical applications that are easy to control and free from environmental pollution. These heat sources can be used for direct heating, molten salt or metal, and floating particles can be used for indirect heating. Due to different cooling methods and processes, the performance of flange pipe fittings is also different, which mainly controls the cooling rate.