400 MPa级耐腐蚀钢筋组织性能研究

Study on Microstructure and Properties of 400 MPa Corrosion Resistant Bar

摘要: 研发了一种400 MPa级含0.45wt%Cu的耐腐蚀钢筋。通过周浸加速腐蚀实验，探究了Cu元素对钢筋耐腐蚀性的影响及腐蚀机理。结果表明，耐腐蚀钢筋在开轧温度为1000～1050℃，终轧温度为950～1000℃的轧制工艺下，轧后屈服强度为450 MPa、抗拉强度为640 MPa、最大力总延伸率为15%。72 h周浸加速腐蚀实验后，耐腐蚀钢筋的腐蚀率为2.217 g/（m²·h），是普通钢筋腐蚀率的41%。

Abstract: A 400 MPa corrosion-resistant steel bar containing 0.45wt% Cu was developed successfully. The influences of Cu element on the corrosion resistance and corrosion mechanism of reinforcement were investigated by periodic immersion accelerated corrosion tests. The results show that the yield strength is 450 MPa, the tensile strength is 640 MPa and the maximum total elongation is 15% when the rolling temperature is 1000 ℃-1050 ℃ and the final rolling temperature is 950 ℃-1000 ℃. The corrosion rate of the corrosion-resistant steel bar is 2.217 g/（m²·h） after 72 h periodic immersion accelerated corrosion experiment and the relative corrosion rate is 41% compared with that of the ordinary steel bar.