采用Gleeble-3800型热模拟试验机对含质量分数1.8%铜和1.0%镍的X65级低碳低镍含铜管线钢进行高温拉伸试验，研究不同温度（850~1 300℃）下的高温塑性。结果表明：含铜管线钢的抗拉强度随着试验温度的升高整体呈下降趋势，在850℃拉伸时抗拉强度达到105 MPa，而在1 300℃时的抗拉强度降至约30 MPa；随着试验温度的升高，含铜管线钢的断面收缩率整体呈增大趋势，当试验温度高于1 050℃时，断面收缩率均在80%以上，表现出较好的高温塑性，850~1 000℃区间断面收缩率在60%左右，应避免在850~1 000℃区间对该管线钢进行大变形量变形；在试验温度高于1 050℃时，含铜管线钢高温塑性的提高与动态再结晶有关；在连铸温度范围（1 100~1 250℃），含铜管线钢具备优异的高温塑性，可以保证连铸坯的冶金质量。

The high temperature tensile test of X65 grade low carbon low nickel Cu-bearing pipeline steel containing 1.8wt% copper and 1.0wt% nickel was carried out with Gleeble-3800 thermal simulation testing machine to study the high temperature plasticity at different temperatures (850-1 300℃). The results show that the tensile strength of the Cu-bearing pipeline steel showed an overall downward trend with increasing test temperature; the tensile strength at 850℃ reached 105 MPa, while the tensile strength at 1 300℃ was reduced to about 30 MPa. With increasing test temperature, the percentage reduction of area of the Cu-bearing pipeline steel showed an overall increase trend. When the test temperature was higher than 1 050℃, the percentage reduction of area was above 80%, showing good high temperature plasticity; the percentage reduction of area at 850-1 000℃ was about 60%, indicating the large deformation of the pipeline steel should be avoided in the range of 850-1 000℃. When the test temperature was higher than 1 050℃, the improvement of plasticity was related to dynamic recrystallization. In the continuous casting temperature range (1 100-1 250℃), the Cu-bearing pipeline steel had excellent high temperature plasticity, which could ensure the metallurgical quality of the continuous casting billet.