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针对特定的SEW管材制造工艺,研究了快速冷却工艺对不同成分中低碳钢SEW管材的显微组织、力学性能及焊缝沟腐蚀敏感性的影响。结果表明:随着冷却速度的提高,先共析铁素体得到了抑制,带状偏析得到了改善,焊缝组织得到了优化;当终冷温度为620~680℃,试验钢的屈服强度提高了55~130 MPa,抗拉强度提高了35~115 MPa,焊缝沟腐蚀敏感系数α降低为1.07~1.13。
According to the manufacturing process of SEW pipe, the effect of rapid cooling process on the microstructure, mechanical properties and weld channel corrosion sensitivity of SEW pipes with different compositions were investigated. The results show that with the increase of cooling rate, the pro-eutectoid ferrite is restrained and the segregation of the strip is improved and the microstructure of the weld seam is optimized. When the final cooling temperature is 620 ~ 680 ℃, the yield strength of the test steel increases 55 ~ 130 MPa, the tensile strength increased by 35 ~ 115 MPa, and the corrosion sensitivity coefficient α of weld ditch decreased from 1.07 to 1.13.