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采用热模拟方法,对两种不同的X70大变形管线钢进行热煨弯管工艺过程模拟,研究了不同加热温度对其组织的影响规律。结果表明,当加热温度为750～850℃时,组织发生不完全相变,硬度下降;当加热温度为1000～1050℃时,组织为粒状贝氏体和板条状贝氏体铁素体。两种钢的化学成分、轧制工艺和原始组织不同,导致加热后显微组织、晶粒尺寸和硬度的变化趋势不同,二次热加工性存在差异。合理选择母管并将加热温度控制在1000～1050℃时,采用X70大变形管线钢制作热煨弯管可获得具有良好强韧性的显微组织,但其塑形和抗大应变性能难以达到原始母材的水平。
The heat simulation method was used to simulate the bending process of two different X70 large deformation pipeline steels. The influence of different heating temperature on the microstructure was studied. The results show that when the heating temperature is 750 ~ 850 ℃, the microstructure of the microstructure is incompletely transformed and the hardness decreases. When the heating temperature is 1000 ~ 1050 ℃, the microstructure is granular bainite and lath bainitic ferrite. Two kinds of steel chemical composition, rolling process and the original organization is different, resulting in heating microstructure, grain size and hardness of the different trends, there are differences in secondary hot workability. Reasonable selection of the parent pipe and the heating temperature is controlled at 1000 ~ 1050 ℃, the use of X70 large deformation of the steel pipe making hot simmer pipe can be obtained with good toughness of the microstructure, but its shape and resistance to large strain of the original hard to achieve the original The base metal level.