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碳钢法兰绝缘连接，使用在不锈钢和碳钢连接的接头上，国内异种钢材料变化，喜欢直接异种钢焊接，还有就是通过法兰连接，但是都没有考虑这两种材料之间存在不同的电位差，会有电位差腐蚀存在。国内设计好像还没有更多注意到这一点，国外工程基本上都是采取这种连接，进行绝缘。法兰面为专用垫片，其两侧有绝缘橡胶包裹。密封面型式为RF.该型绝缘垫为套装，包括螺栓绝缘套，螺母绝缘垫片，以及绝缘密封垫，可以适用于榫槽，RF,FF等密封面型式（根据压力等级不同厚度稍有区别），碳钢法兰和不锈钢螺栓的组合潜在的问题主要是两者电位差异较大，存在电偶腐蚀风险，加速碳钢侧腐蚀。高温下使用（温度大于200），没有电解质，没有电偶腐蚀。常温下要考虑气候、雨水等的腐蚀，不过考虑到法兰的面积比螺栓大很多，问题已不大。
Insulated steel flange connection, used in stainless steel and carbon steel connecting joints, the internal changes in dissimilar steel materials, like direct dissimilar steel welding, there is through the flange connection, but are not considered between the two materials there are different potential difference, there will be potential difference corrosion. Internal design seems to have no more note of this, foreign works are basically taking this connection, for insulation. Flange gaskets for the special, the rubber insulation on both sides of a package. Sealing surface type for the RF. This type of insulation pad package, including the bolt insulation kits, nut insulation pads, gaskets and insulation can be applied to tongue and groove, RF, FF and other sealing surface type (based on slightly different pressure levels of different thickness ), carbon steel flanges and stainless steel bolt combination of the potential problem is large potential difference between the two, there is the risk of galvanic corrosion, accelerated corrosion of carbon steel side. Used under high temperature (temperature greater than 200), no electrolyte, no galvanic corrosion. Room temperature, to consider the weather, rain and other corrosive, but taking into account the flange area much larger than the bolt, the problem has not.