提高1Cr18Ni9Ti航空管抗晶间腐蚀性能的研究

Study on the Enhancement of Intergranular Corrosion Properties Of 1Cr18Ni9Ti Pipe Used in Aerospace Field

众所周知，为了保证不锈钢的耐蚀性，必须严格控制其含碳量。本文通过对小直径1Cr18Ni9Ti航空管抗晶间腐蚀性能与Ti、C含量的关系进行了分析，并进行了提高其抗晶间腐蚀性的针对试验研究。研究结果表明，将C含量控制在0．025～0．045％之间，Ti含量控制在0．2～0．4％之间，即Ti、C含量比值约为8—11时，1Cr18Ni9Ti钢管抗晶间腐蚀性较好；采用低温燃烧除酯，可以有效避免在制管过程中增加1Cr18Ni9Ti钢管的含碳量，从而提高其耐蚀性；配以适当的稳定化处理，也可以在一定程度上提高1Cr18Ni9Ti钢管的抗晶间腐蚀性能。

As we all know, the carbon contamination of stainless steel must be very slow to guarantee its corrosion performance. In this paper, the relationship between the C and Ti composition of 1Cr18Ni9Ti and its intergranular corrosion properties was discussed in detail. The results showed 1Cr18Ni9Ti pipe containing 0.025- 0.045% C and 0.2- 0.4% Ti had good intergranular corrosion properties. And if grease in the pipe was cleared before heat treatment and the pipe was stabilization treated, its intergranular corrosion properties can also be enhanced.