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Thread: Forged Flanges VS. Casted Flanges

  1. #1

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    Question Forged Flanges VS. Casted Flanges

    I'm Pamella, i'm manufacturing a Shell-Tubes Heat Exchanger, according to API 660, and also TEMA R., but i have a problem about the manufacturing process of 2 flanges, they had to be According to ASTM A105N, but in Peru, we don't fabricate them, because of the dimensions, we are talking about 25in. (diameter), and they doesn't match with the dimensions of the Standard Flanges A105 25in. 300#,so, that's why i have to manufacture them, because import them, will take so much time, and i don't have enough time.

    I will be pleasure if some of you can help me about the difference between forged and casted flanges,

    I'll change forged to casted flanges, i'll manufacture them according to the ASTM A216 Terms,for the WCB Grade, but i've seen that they mention some heat treatment that depends on the chemical composition, how can i select it?, is it correct just to normalized them?or they'll need also Quenched and Tempered, as they mention in ASTM A703?

    I'll Want to know how can i select the correct heat treatment,including the temperatures, number of cicles, and the duration of each of them, and if it exists some risks on changing the manufacturing process, from ASTM ASTM A105N (Normalized), to ASTM A216 Gr. WCB?

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  3. #2

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    Re: Forged Flanges VS. Casted Flanges

    Forging and casting flanges are two very different manufacturing methods. When something is cast the material is heated above its melting temperature and poured into a mold where it solidifies. When something is forged it is physically forced into shape while remaining in a solid state – although it is frequently heated.
    The forged flanges has higher production cost as compared to casted one. The basics of why are pretty simple. When you melt metal to cast it, the grain size is free to expand. When it cools back to a solid, the grain structure is courser and more random, decreasing its strength. You can contact Forging Manufacturer Company like CHW Forge for more details.
    Last edited by ramprakashjoshi; 09-30-2016 at 10:34 AM.

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