Is it better to use forgings for flanges or cut them from sheet metal (recommended)?

Of course, forged flanges are the best, haha. There are many models of such flanges, and their strength and pressure resistance can meet the customers’ requirements.

For workpieces made of the same material, those that are forged have much higher mechanical strength than those that are not forged. Therefore, for important parts or those subjected to high stresses, it is required that the blanks be forged during the design stage. Therefore, forged flanges have much higher mechanical strength than unforged flanges. It must be great!

Forged flanges have much higher mechanical strength than unforged flanges

Those without a neck flange can be manufactured from sheet metal, have a lower nominal pressure, and are subject to limitations in terms of application areas. Flanges with necks should be manufactured by hot rolling or forging, and the axis of the finished flange must be parallel to the axis of the original billet. When manufacturing flanges with necks using steel plates when necessary, the following requirements must be met: a) The steel plates shall undergo ultrasonic testing to ensure there are no delamination defects ； b) Strips should be cut along the rolling direction of the steel plate; after bending and butt welding, they form a ring, with the surface of the steel plate serving as the side surfaces of the ring ； c) The butt joints of the rings shall adopt a fully penetrative weld structure ； d) Ring butt joints shall undergo post-weld heat treatment and 100% radiographic or ultrasonic testing, with the acceptance criteria in accordance with JB4700.

Support for Floor 5! Forged flanges certainly have higher mechanical strength than flanges made from sheet metal, but the operating conditions must also be taken into account. After all, the cost of forged flanges is more than twice that of those made from sheet metal; in our manufacturing plant, we strive to save wherever possible! Why not do it? I suggest the original poster visit the forum more often – they will surely learn something, because I know that those working in process equipment need to have a comprehensive range of knowledge!

From a materials science perspective, forgings are superior; during the forging process, large grains are broken down, resulting in a more uniform material structure and the elimination of defects and stresses. Take an example from when I was in school: the more you knead flour, the stronger its texture becomes. :lol :lol

Of course, flanges that are forged are better; it’s necessary to analyze this from the perspective of metal heat treatment, but I don’t know how to do that

The forged flanges are of good quality, with internal defects eliminated.

Flanges used in applications with lower requirements, such as plate flanges or slip-on flanges, can be manufactured from sheet metal as long as their thickness is not too great; this makes the manufacturing process simpler and reduces the cost. In applications with high requirements, such as those involving neck flanges, forgings are generally used more often. The mechanical properties of forgings are superior to those of sheets, which is why they are employed in situations with high demands; however, their production requires higher standards and results in higher costs.

Seeing everyone’s enthusiasm for forged flanges, I couldn’t help but offer some opposing views. We are a equipment manufacturing company, and we have encountered quality issues with forged flanges. The problem is that layering or cracks occur during the forging process; at first, no one notices these issues, but they become apparent when hydraulic pressure is applied. It’s impossible to repair such flanges, so the only option is to cut them out and replace them. Smaller flanges are less of a problem, but larger flanges present even greater challenges. This delays projects and results in significant financial losses. From a forging perspective, forged flanges should be of better quality than those made by cutting steel plates. However, it’s essential to use products from reputable, large manufacturers – otherwise, you will suffer serious consequences.

Those upstairs who are curious: if forgings are to be used, why not choose manufacturers with a good reputation? We have contacted many forging manufacturers, and from the most basic perspective of business owners, which manufacturer wouldn’t want to be among the best?

Forged flanges exhibit good comprehensive mechanical properties and can withstand significant stresses; those that have undergone surface heat treatment possess both high strength and excellent toughness. Due to their use in applications involving high pressures, their price is relatively high. The flange cut directly has uniform material. Each of them has its advantages and disadvantages; when choosing one, it is necessary to consider the operating environment and medium conditions under the guidance of relevant standards.

Forgings should be better. But it’s hard to say about current products. :Q It’s really not easy to find something that is genuine.

Forged parts are definitely the better choice; it seems that parts made from sheet metal are used less these days. Is it because the processing of sheet metal no longer meets the **standards? This post was last edited by TE1530926 on 2008-2-2 at 21:25.]

Of course, forged flanges are the better choice; they have superior mechanical properties, but their price is higher. When making a specific selection, it is necessary to consider the operating environment and medium conditions under the guidance of relevant standards.

The stress on the material is best in the rolling direction and worst in the thickness direction. Using steel plates to make flanges is certainly not as good as using forgings.

Of course, flanges that are forged are the best. But whether little Fran’s forging material is actually a forging is the question

Is it better to use forgings or sheets for flanges? This needs to be considered in terms of working conditions such as pressure and temperature, the hazard level of the medium, cost-effectiveness, and the type of flange chosen. This is explained in both GB150 and HG20580.