Research on Low-temperature DWTT of 33mm Thick-wall X80 Pipeline Steel Plate
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摘要: 以壁厚为33 mm的X80管线钢板为研究对象，结合X80成分设计，在其他工艺参数不变的情况下，采用不同的未再结晶区坯料厚度进行轧制33 mm壁厚X80试验，随后对获得的钢板进行性能分析，并采用电子显微镜进行组织观测。结果表明，适当增加未再结晶区坯料厚度（即精轧阶段的开轧坯料厚度），有利于细化铁素体晶粒，提高X80管线钢板DWTT低温落锤剪切面积率和冲击韧性。Abstract: The shear area of low-temperature DWTT of thick-wall X80-grade pipeline steel plate is now becoming a high technical challenge.In the paper,based on alloying design, 33 mm thick-wall X80 pipe line steel plates were obtained through different thickness of inter-mediate bar from non-recrystallization austenite region rolling when the other processing parameters of TMCP（thermo mechanical control process） maintained same values.The micro-structures and properties of resulted plates were investigated and analyzed by means of optical microscope.Comparing the microstructures obtained by the two different rolling processes,it is founded out that increasing thickness of intermediate bar from non-recrystallization austenite region（before starting finishing rolling） can enhance the volume fraction of ferrite and obtain smaller ferrite grains,thus can increase the shear area percent（SA%） of low-temperature DWTT and toughness.
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Key words:
- X80 pipeline steel plate /
- TMCP /
- microstructures /
- DWTT /
- shear area percent(SA)
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