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碳钢法兰公称压力的确定与法兰的最大操作压力、操作温度以及法兰材料有关。把两个管道、管件或器材，先各自固定在一个法兰盘上，两个法兰盘之间，加上法兰垫，用螺栓紧固在一起，完成了连接。因为在制定法兰尺寸系列、计算法兰厚度时，是以16MnR在200℃时的机械性 能为基准制定的。所以规定以此基准所确定的法兰尺寸，在200℃时，它的最大允许操作压力就认为是具有该尺寸法兰的公称压力。所谓公称压力 PNO.6MPa的法兰，就是指具有这样一种具体尺寸的法兰，该法兰是用16MnR制造的，在200℃时，它的最大允许操作压力是0.6MPa。
如果把这个PN0.6MPa的法兰用在高于200℃的条件下，那么它的最大操作压力将低于它的公称压力0.6MPa。反之，如果将它用于低于200℃的条件下，仍按200℃确定其最高工作压力。如果把大型异型法兰的材料改为Q235-A，那么Q235一A钢的机械性能比16MnR差，这个公称压力PN0.6MPa的法兰， 即使是在200℃时操作，它的最大允许操作压力也将低于它的公称压力。
碳钢法兰连接使用方便，在使用中发挥重要的作用和价值。 在工业管道中，大型异型法兰连接的使用十分广泛，在工业中具有不同的含义和作用。在家庭内，管道直径小，而且是低压，看不见法兰连接。如果在一个锅炉房或者生产现场，到处都是大型异型法兰连接的管道和器材。如果把法兰的材料由16MnR改为15MnVR，那么，由于15MnVR的机 械性能优于16MnR，这个公称压力PN0.6MPa的法兰，在200℃操作时，它的最大允许操作压力将高于它的公称压力。总之，只要法兰的公称直径、公称压力确定了，法兰的尺寸也就确定了。至于这个法兰允许的最大操作压力是多少，那就要看法兰的操作温度和用什么材料制造的。
Carbon steel flange and flange nominal pressure of determining the maximum operating pressure, operating temperature, and the flange material. The two pipes, fittings or equipment, each first fixed in a flange on the flange between the two, together with flange pad, fastened together with bolts to complete the connection. Flange size as in the development series, flange thickness calculation is based on 16MnR at 200 ℃, the mechanical properties of the benchmark set. Therefore, this benchmark to determine the provisions of the flange size, at 200 ℃, its maximum allowable operating pressure that is a nominal pressure of the size of the flange. The so-called nominal pressure PNO.6MPa the flange, is that with such a specific size of the flange, the flange is made 16MnR, at 200 ℃, its maximum allowable operating pressure is 0.6MPa. If this PN0.6MPa the flange higher than under the conditions of 200 ℃, its maximum operating pressure will be lower than its nominal pressure 0.6MPa. Conversely, if it is used under the conditions of less than 200 ℃, 200 ℃ to determine based upon the maximum working pressure. If the large-scale special-shaped flange of the material to Q235-A, then the Q235 steel mechanical properties of a A 16MnR worse than, the nominal pressure PN0.6MPa the flange, even when operating at 200 ℃, its maximum allowable operating pressure will be lower than its nominal pressure. Carbon steel flange easy to use, in use play an important role and value. Pipeline in the industry, the use of large-scale special-shaped flange wide, in industry have different meanings and functions. Within the family, small diameter pipes, but also low pressure, see flange connection. If a boiler room or a production site, full of large-scale special-shaped flange connection of pipes and equipment. If the flange of the material by the 16MnR to 15MnVR, then, due to superior mechanical properties 15MnVR 16MnR, the nominal pressure PN0.6MPa the flange, operating at 200 ℃, its maximum allowable operating pressure will be higher than its nominal pressure. In short, as long as the nominal diameter of flange, nominal pressure set, also set the size of flange. As to the maximum allowable operating pressure flange is how much it depends on flange of operating temperature and what material.