Details of carbon steel flange

Details of carbon steel flange:

The carbon steel flange is tight and reliable. It has two sealing surfaces, and various plastics are widely used in the sealing surface materials of the ball valve at present, which has good sealing performance and can realize complete sealing.

Since carbon steel flanges have wiping properties during opening and closing, they can be used in media with suspended solid particles. Model Q41F–16C Q41F–25C American standard A105 is about 0.9% (the standard is 1.05Max can reach 1.65%Max with the carbon content decreasing), as for the national standard 16Mn content is about 1.3% (standard 1.2% ~ 1.6%) Japanese standard S25C If it is lower than 0.6%.

Another meaning of carbon steel flange is: the flange plate produced according to the size and tolerance range required by the national standard is different from the flange piece produced not according to the standard size, also called the second standard flange (some people call it a non-standard method) Lan is incorrect),

usually, some unscrupulous merchants will reduce the two dimensions of flange plate thickness and outer diameter to achieve the purpose of saving materials, and use scrap steel or scrap steel to process flanges, usually, this kind of steel has a chemical composition and Scraps whose mechanical properties do not meet the standards, and even flanges produced by private steelmaking in black steel factories.

The steelmaking technology used in this kind of private steelmaking is outdated and cannot guarantee mechanical properties and welding performance. It may not be welded to steel pipes during use. Or the steel itself has cracks, pores, etc. and it will leak after welding.

Its value specifically has the following aspects:

First, if a section of the pipe fittings connected by carbon steel flanges is damaged, it can be easily replaced. This eliminates the need to replace the entire fitting system;

Second, use carbon steel flanges to connect the pipe fittings. During the maintenance and inspection of the pipe fittings, the pipe fittings can be easily removed and inspected piece by piece, which improves the inspection speed and accuracy;

Third, pipe fittings connected by carbon steel flanges can be easily operated when a certain section of the pipeline needs to be sealed.
The pressure marks specified in this standard are divided into PN marks and Class marks.

Marked with 12 pressure levels
Respectively: PN2.5; PN6; PN10; PN16; PN25; PN40; PN63; PN100; PN160; PN250; PN320;
Marked with 6 pressure levels

Respectively: Class 150; Class 300; Class 600; Class 900; Class 1500;