基于Gray博士的低碳低锰专利设计X65MS管线钢的合金成分,通过Gleeble-3800热模拟试验机研究形变奥氏体的相变规律。将得到的膨胀量曲线,结合各个冷速下的金相显微组织以及显微硬度,绘制出CCT曲线。结果表明,对于该成分的X65MS管线钢,在40℃/s的冷却速度下,能够得到较高的抗H_2S腐蚀性能的单相贝氏体显微组织。同时,终冷温度不得低于480℃,以防止因为马氏体组织的出现而引起组织不均匀性,降低管线钢的抗H_2S腐蚀性能。 Based on Dr. Gray’s low-carbon, low-manganese patented design of the alloy composition of X65MS pipeline steel, the phase transformation of deforming austenite was studied by Gleeble-3800 thermal simulation testing machine. The obtained volume expansion curve, combined with the microstructure of the microstructure and the microhardness at various cooling rates, to draw the CCT curve. The results show that for the X65MS pipeline steel of this composition, single-phase bainite microstructure with high corrosion resistance to H 2 S can be obtained at a cooling rate of 40 ℃ / s. At the same time, the final cooling temperature shall not be lower than 480 ℃, in order to prevent the occurrence of martensite caused by tissue non-uniformity, reduce the corrosion resistance of H_2S pipeline steel.