460MPa级高强抗震耐蚀耐火薄板600℃保温3h透射照片，在600℃保温3h后，晶粒比较纯净，MA岛基本消失，随着保温时间延长，高温屈服强度没有衰减，主要原因是位错线上存在大量第二相粒子，第二相粒子可有效阻碍位错的位错线的滑移，而且位错密度很高，位错之间相互缠结、阻碍，共同保证耐蚀耐火钢高温屈服强度。

460 mpa grade high earthquake resistant corrosion resistant fireproof plate transmission photos, 600 ℃ heat preservation 3 h after 600 ℃ heat preservation 3 h, grain is pure, MA island disappeared basically, with the longer time of heat preservation, high temperature yield strength without attenuation, the main reason is that the dislocation line exist a large number of second phase particles, the second phase particles can effectively prevent the dislocation slip dislocation line, Moreover, the dislocation density is high, and the dislocations are entangled and obstructed to ensure the high-temperature yield strength of corrosion resistant refractory steel.