预先热处理对新型耐候建筑钢性能的影响研究

Influence of Pre-heat Treatment on Properties of New Weathering Steel for Construction

采用三种不同的工艺对钒微合金化新型耐候建筑钢进行了预先热处理,并进行了显微组织观察、拉伸性能、冲击性能和耐腐蚀性能的测试。结果表明,与常规热处理相比,等温预先热处理可使钒微合金化新型耐候建筑钢的晶粒更为细小、组织更为均匀,获得更佳的拉伸性能、冲击性能和耐腐蚀性能。优化的钒微合金化新型耐候建筑钢的预先热处理工艺为580℃×2 h+500℃×1 h,此条件下合金的抗拉强度达892 MPa,屈服强度达840 MPa,断后伸长率达26.8%,96 h乙酸盐雾腐蚀试验后的质量损失率低至3.39%。

Pre-heat treatment of new vanadium micro-alloying weather resistance construction steel was carried out by using three different processes. And the microstructure observation, the test of tensile properties, impact resistance and corrosion resistance properties were carried out. The results show that compared with conventional heat treatment, the isothermal pre-heat treatment can make the grain of new vanadium micro-alloying weather resistance construction steel more uniform and finer, and obtain better tensile properties, impact resistance and corrosion resistance properties. The optimized pre-heat treatment process of new weather resistance construction steel is 580 ℃ ×2 h＋500 ℃×1 h. Under this condition, the tensile strength of the alloy is 892 MPa, the yield strength is 840 MPa, the elongation is 26.8 %, and the mass loss rate after acetic acid salt spray corrosion test for 96 h is as low as 3.39%.