Material selection for pressure vessels

This post was last edited by fzujunru on 2019-12-3 at 13:17. Thick plates have inferior properties compared to thin plates; their performance varies with thickness, and they suffer from layer-wise tearing perpendicular to the rolling direction. Additionally, thick plates are difficult to weld. Therefore, in the GB system, as the thickness increases, the allowable stress of the material decreases. Therefore, high-pressure cylinders are usually forged-welded sections rather than thick plates. In the case of taking over production, there are specification limits for seamless and welded steel pipes as well as sheet coils (which are also constrained by manufacturing and processing capabilities). When a higher design pressure is required, forgings are typically used for thick-walled pipes in order to meet the needs for reinforcement through opening holes

How should I put it for this question??? I’ll not say anything:lol

At what thickness of steel plate should forgings be used? What pressure does a high-pressure vessel refer to? And in what situations are forgings used for components such as nozzles? Could you explain in more detail? I heard that multi-layer coiled plate type is used only in certain high-pressure situations

Dear experts, please give me some guidance. How do you make your selections in design?

If the shell is made of forgings, it is a high-pressure or ultra-high-pressure vessel; the shells of medium- and low-pressure vessels are definitely made of sheet metal. The use of forgings for pipe ends is quite common; there are issues related to the design of reinforcement structures, the procurement of steel pipe materials, special materials, and so on

It is also related to manufacturing. For example, when it’s not possible to roll steel plates that are small in diameter but thick in thickness, forgings have to be used. The thickest steel plate I’ve used had a thickness of 140 mm and a diameter of 2600 mm. Flanges are generally made from forgings, while for pipes, if the pipe dimensions meet the requirements, pipes can be used; otherwise, forgings are required. You need to gain experience over time, or if you have specific equipment, you can use it to help with a detailed analysis

My device has a diameter of 1200 and a thickness of 100. Some manufacturers use rolled sheets for this; I don’t know how to roll sheets like this – it’s not multi-layered

The sheet metal can be rolled; based on its thickness, it is likely a high-pressure device, and the fittings are made of forgings

Are your 140 barrels rolled or forged?