Are there butt-welded cast iron flanges with protrusions?
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Why are there so many standards for steel flanges in national standards, while there are so few standards for cast iron flanges? For example, is there no standard for butt-welded cast iron pipe flanges?
I’ve seen flanges that are forged; I’ve never seen cast iron flanges, so there probably aren’t any such flanges.
Steel flange materials include carbon steel, stainless steel, low-temperature steel, and so on. However, flanges are all \"forged\"; I have never heard of any \"cast\" ones, that is, those made of cast iron.
Will casting work? Can it ensure a smooth flange surface?
There are cast flanges, but their application range is limited.
In the design and installation of chemical plants, cast iron flanges are rarely used; their strength is not high, and since they are cast, defects are difficult to eliminate, nor can they withstand very high pressures； Secondly, it is not easy to weld; cast iron has a high carbon content, and ductile iron is very difficult to weld. Cast iron welding rods are required, while for ductile iron, 20# welding rods can be used.
It should be a cast iron flange; it seems that a threaded flange is the one used instead
Many of the flanges attached to valves and equipment are cast together with the valve body itself, but what standards govern the casting of these flanges?
Cast iron is primarily wear-resistant, but it has poor toughness and is not suitable for making flanges; it will crack under uneven stress during installation.
I’ve never heard of how to weld cast materials!
This question is quite practical; I hope someone can answer it
Cast flanges are of the lowest quality and also the cheapest; under normal circumstances, forged flanges or plate flanges should be used. Cast flanges are usually those produced by some manufacturers in an attempt to reduce costs, by passing them off as forged flanges.
Many of the flanges attached to valves and equipment are cast together with the valve body itself, but what standards govern the casting of these flanges?
According to the **standards; otherwise, how can the flanges be matched? The strength of the cast flanges is insufficient; they may even break, and sand inclusions can be present.