Technical conditions and characteristics of carbon steel flanges!
Release time:
2021-07-07
The other meaning of carbon steel flange is: a flange plate produced according to the size, tolerance range, and other requirements of national standards, distinguished from flanges produced without standard sizes, also known as secondary standard flanges (it is incorrect for some to call them non-standard flanges). Usually, some unscrupulous merchants will reduce the thickness and outer diameter of the flange plate to save materials, and they also use waste steel or scrap steel to process flanges.
Another meaning of carbon steel flange is: a flange plate produced according to the size, tolerance range, etc. required by national standards, distinguished from flanges produced without standard sizes, also known as second standard flanges (it is incorrect to call them non-standard flanges). Usually, some unscrupulous merchants will reduce the thickness and outer diameter of the flange plate to save materials, and also use waste steel or scrap steel to process flanges.
Typically, this type of steel is substandard scrap with inadequate chemical composition and mechanical properties. Even worse, some black steel mills produce flanges using privately smelted steel, which employs outdated steelmaking techniques that cannot guarantee mechanical and welding properties. When used, it may not weld properly with steel pipes, or the steel itself may have cracks, pores, etc., leading to leaks after welding. Therefore, when purchasing flange plates, it is advisable to choose carbon steel flanges.
Carbon steel flanges are tight and reliable. They have two sealing surfaces, and the sealing surface material of the ball valve widely uses various plastics, ensuring good sealing and achieving complete sealing. Due to the wiping nature of carbon steel flanges during opening and closing, they can be used in media containing suspended solid particles. Model Q41F--16C Q41F--25C American standard A105 is approximately 0.9% (the standard is 1.05Max, which can decrease to 1.65%Max as carbon content decreases), while the national standard 16Mn content is about 1.3% (standard 1.2%～1.6%). The Japanese standard S25C is relatively low, below 0.6%.
The production processes for carbon steel flanges include forging, casting, plate rolling, and plate cutting, among others. Among these, forging is the most expensive, followed by plate products, and casting products are the least expensive. In terms of quality, forging is the best, rolling is second, and casting is third. However, the caliber of forged products is generally smaller.
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