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分步淬火和二次回火有助于改善材料的综合性能。采用不同的淬火和回火工艺对纳米改性新型建筑钢进行了热处理。经过显微组织、力学性能和耐腐蚀性能的分析后发现:分步淬火较常规淬火使材料的抗拉强度增加15%、屈服强度增加18%、伸长率增加5%、乙酸盐雾(AASS)试验腐蚀10 d后的质量损失率减少2.73%。纳米改性新型建筑钢结构材料的热处理工艺优选为:980℃×10 min+920℃×20 min分步淬火后220℃×60 min二次回火。
Step quenching and secondary tempering help to improve the overall performance of the material. Using different quenching and tempering process of nano-modified new building steel was heat-treated. After microstructure, mechanical properties and corrosion resistance analysis showed that: the more conventional quenching step quenching the tensile strength of the material increased by 15%, yield strength increased by 18%, 5% increase in elongation, acetate fog ( AASS) after 10 days of corrosion reduced the mass loss rate of 2.73%. The heat treatment process of nanometer modified new building steel structure material is as follows: 980 ℃ × 10 min + 920 ℃ × 20 min, followed by 220 ℃ × 60 min secondary quenching.