Flange forging problem?
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Can neck flanges be made of round steel without forging? GB150 says that neck flanges should be made of hot-rolled or forged parts. How do you understand the word "hot-rolled" here?
Hot rolling is relative to cold rolling. Cold rolling is rolling below the recrystallization temperature, while hot rolling is rolling above the recrystallization temperature. To put it simply, a piece of steel billet is heated and rolled several times, then trimmed and straightened into a steel plate. This is called hot rolling. It can significantly reduce energy consumption and reduce costs. During hot rolling, the metal has high plasticity and low deformation resistance. * * The energy consumption of metal deformation is reduced. Hot rolling can improve the processing performance of metals and alloys, that is, break the coarse grains in the casting state, significantly heal cracks, reduce or eliminate casting defects, transform the as-cast structure into a deformed structure, and improve the processing performance of the alloy.
The hot rolling you refer to refers to the hot rolling during the production of raw materials in steel plants. The hot rolling I refer to refers to the hot rolling during the flange manufacturing stage. They should be two different concepts. The hot rolling mentioned in flange refers to the fact that when the steel mill rolls the steel, it is directly rolled into flange blanks.
@kareale88 explains the standard by heart
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“It should be processed by hot rolling or forging." This is how I understand this sentence. As long as the raw materials are hot rolled or forged, the subsequent processing mainly refers to pure machining of cutting dimensions, and any processing with hot and cold deformation is not allowed. In addition, the common raw materials for hot rolling production are nothing more than round bars, wire rods, steel pipes, or steel plates. Hot rolling and forging are actually similar in nature. They both belong to the category of metal pressure processing. The processing temperature is above the AC3 temperature of the material. The difference is that hot rolling mainly targets products with single shape rules and can be produced continuously in large quantities, such as wire rods, round bars, and steel pipes. Some complex shapes, such as valve bodies and crankshafts, usually require forging. Compared with hot rolling, the cheaper and simpler hot processing is casting. Castings usually have more defects, such as: Porosity, shrinkage holes, segregation, etc. Most of these defects can be remelted by rolling.