大型桥梁支座板铸造工艺及低温性能研究

Research on Casting Process and Low Temperature Performance of Large Bridge Support Plate

文章优化大型桥梁支座板的铸造工艺,并进行低温性能试验,以确保桥梁结构在极端环境下的使用安全。先阐述支座板铸造工艺的流程与要点,然后选取低合金钢,制备4组不同化学成分配比的试样,并进行退火、淬火和回火等多道处理,最后通过低温冲击试验和低温拉伸试验,测试各试样在-20℃和-40℃条件下的力学性能。结果显示,碳含量的增加会显著降低材料韧性,提高材料强度;锰含量的增加有助于提高材料韧性,但需控制在适当范围内。

This paper optimizes the casting process of large bridge support plates and tests their low-temperature performance to ensure structural safety in extreme environments.This paper describes the key points of the casting process,then prepares four sample groups of low-alloy steel with different chemical compositions,followed by annealing,quenching,and tempering,and the mechanical properties of each sample at -20℃ and -40℃ are tested by low temperature impact test and low temperature tensile test.Results show that increasing carbon content reduces toughness and increases strength,while increasing manganese content improves toughness within a suitable range.