Carbon Steel Flanges

Carbon steel flange, that is, the flange or end flange connector made of carbon steel. It contains a flange made of carbon steel, which is called a carbon steel flange. Common materials are cast carbon steel grade WCB, forging A105, or Q235B, A3, 10#, #20钢, 16 manganese, 45 steel, Q345B, etc.

Usually to prevent rust, there is an electroplating layer (yellow zinc, white zinc, etc.) on the surface of the flange, or brush anti-rust oil and spray anti-rust paint.

The pressure marks specified in this standard are divided into PN marks and Class marks.

The PN is marked with 12 pressure classes

They were: PN2.5; PN6; PN10; PN16; PN25; PN40; PN63; PN100; PN160; PN250; PN320; PN400

Class is marked with 6 pressure classes

They are: Class 150; Class 300; Class 600; Class 900; Class 1500; Class 2500

Another meaning of carbon steel flange is: the flange produced in accordance with the size and tolerance range required by the national standard, which is different from the flange that is not produced according to the standard size, also known as the second standard flange (some people call the non-standard flange is incorrect), usually some unscrupulous merchants will reduce the thickness of the flange, The outer diameter of two sizes to achieve the purpose of saving materials, as well as the use of scrap steel or scrap steel processing flange, usually this steel is a chemical composition and mechanical properties of the substandard waste, even more with the black steel mill private steelmaking production flange, the private steelmaking technology used in this private steelmaking can not guarantee the mechanical properties and welding performance, the use of steel may not be able to weld with the steel pipe, or the steel itself has cracks, pores, etc. Therefore, when buying flanges, try to choose carbon steel flanges.

Features and parameters

Carbon steel flanges are tight and reliable. It has two sealing surfaces, and the sealing surface material of the ball valve is widely used in various plastics, which has good sealing performance and can achieve complete sealing. Since carbon steel flanges are wipeable 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, which can decrease with the carbon content to 1.65% Max), and the content of the national standard 16Mn is about 1.3% (standard 1.2%~1.6%), and the Japanese standard S25C is relatively low, below 0.6%.

Commonly used processes

The production process includes forging, casting, medium plate rolling, medium plate cutting, etc.

Among them, the forging price is the highest, the medium plate product is the second, and the casting product is the lowest. In terms of quality, forged is the best, rolled is the second, and cast is the third. But the diameter of the forging is generally smaller.