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采用“系列温度冲击试验法”测定了一种X80管线钢在-100～20℃的冲击功,分析了该管线钢冲击断口的分层现象以及冲击韧性的影响因素。综合冲击吸收功、脆性断面率及断口形貌,确定了其韧脆转变温度为-83℃。对于高钢级管线钢,可通过采用先进的冶炼工艺和控轧控冷工艺严格控制化学成分、获得细小的晶粒和均匀的针状铁素体组织,来提高钢的冲击韧性、降低韧脆转变温度。
The impact energy of X80 pipeline steel at -100 ~ 20 ℃ was measured by the “series of temperature impact test”, and the stratification of the impact fracture of the pipeline steel and the influencing factors of impact toughness were analyzed. The impact energy, brittle fracture area and fracture morphology were comprehensively analyzed. The ductile-brittle transition temperature was -83 ℃. For high steel grade pipeline steel, through the use of advanced smelting process and controlled rolling and controlled cooling process strictly control the chemical composition, access to small grains and uniform acicular ferrite to improve the impact toughness of steel and reduce the brittleness Change the temperature.