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针对250 mm Q345D存在的屈服强度偏低的情况,研究了热处理温度和冷却速度对250 mm厚钢板性能影响。通过小炉子热处理实验,研究了不同热处理温度下钢板性能的变化趋势和缓冷对性能影响。结果表明,车底炉正火后进行650~700℃的小炉子热处理能提升钢板1/4厚度位置屈服强度和冲击韧性,同时抗拉强度稍有降低,延伸率维持不变;小炉子800~1 000℃热处理后相比车底炉热处理屈服强度呈线性提高,抗拉强度大幅提高,冲击性能在800~900℃也大幅提高;正火后缓冷对屈服强度和抗拉强度都有一定影响。本研究为现场生产特厚钢板提供了指导,提高了产品的质量。
Aiming at the low yield strength of 250 mm Q345D, the influence of heat treatment temperature and cooling rate on the properties of 250 mm thick steel plate was studied. Through the experiment of small furnace heat treatment, the change trend of steel plate performance under different heat treatment temperatures and the influence of slow cooling on the performance were studied. The results show that the small furnace heat treatment at 650-700 ℃ can improve the yield strength and impact toughness of the steel plate at the thickness of 1/4, while the tensile strength slightly decreases while the elongation remains unchanged; After 1000 ℃ heat treatment, the yield strength increases linearly compared with the heat treatment of the car hearth furnace, the tensile strength increases greatly and the impact performance also increases greatly from 800 ℃ to 900 ℃. The slow cooling after normalizing has a certain influence on the yield strength and tensile strength . This study provides guidance for on-site production of thick steel plate and improves the quality of the product.