正火对含锶建筑耐候钢性能的影响

Effect of Normalizing on Properties of Weathering Steel Containing Strontium for Building

采用不同工艺对含锶新型建筑耐候钢09MnCuPTiSr进行了正火处理,并进行了试样耐腐蚀性能和耐磨损性能的测试与分析。结果表明：随正火温度从730℃提高到910℃（正火时间3h）,或随正火时间从1h延长到5h（正火温度870℃）,耐候钢的耐腐蚀性能和耐磨损性能均先提高后下降。在正火时间3h时,870℃正火的09MnCuPTiSr钢的腐蚀电位比730℃正移285mV,磨损体积减小44%。在正火温度870℃时,3h正火的09MnCuPTiSr钢的腐蚀电位比1h的正移134mV,磨损体积减小32%。正火温度优选为870℃,正火时间优选为3h。

New typed 09MnCuPTiSr weathering steel containing strontium for building was normalized by using different processes. And the corrosion resistance and wear resistance of the samples were tested and analyzed. The results show that the corrosion resistance and wear resistance of the samples firstly increase and then decrease with the normalizing temperature increasing from 730 ℃ to 910℃（normalizing time of 3 h）, or the normalizing time extending from 1 h to 5 h （the normalizing temperature of 870 ℃）. When the normalizing time is 3 h, compared with the corrosion potential after normalizing at 730 ℃, the corrosion potential of 09MnCuPTiSr steel after normalizing at 870 ℃ shifts positively by 285mV, and the wear volume decreases by 44%. When the normalizing temperature is 870℃, the corrosion potential of 09MnCuPTiSr steel after normalizing for 3 h shifts positively by 134 mV, and the wear volume decreases by 32% compared with the corrosion potential after normalizing for 1 h. The optimized normalizing temperature and time are 870 ℃ and 3 h, respectively.