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首页> 外文会议>Proceedings of the 10th International Conference on Steel Rolling. >Development of Ultra-high-strength Linepipe Steel X100 and X120
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Development of Ultra-high-strength Linepipe Steel X100 and X120

机译：超高强度管线钢X100和X120的开发

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In this study, two chemical compositions, both of which contain about 0. 04 wt% C, 0. 2 wt% Si, 2wt% Mn and adequate percentages of other elements including Nb, Ti, Cu, Ni, Cr, Mo and B, have been verified to be suitable candidates for API X100 and X120 grades. A TMCP schedule that was used to process the above two compositions into API X100 and X120 grade plates was developed using the following parameters; (1) a reheating temperature between 1180℃ and 1200℃ ; (2) a rough rolling start temperature of 1000℃ , (3) a finish rolling with a total reduction=2 70% and a start temperature of 820?. , and (4) an accelerated cooling with a finish temperature of 415 and a cooling rate=20℃/s. Micro structures obtained for both steels are lower bainite with marten site/austenite (MA) islands. It was found that the size and distribution of MA islands, which were apparently related to the baimtic transformation temperature and time, may significantly influence the steel strength.
机译：在这项研究中，两种化学成分均包含约0. 04 wt％的C，0。2 wt％的Si，2wt％的Mn和足够百分比的其他元素，包括Nb，Ti，Cu，Ni，Cr，Mo和B已被验证为适合API X100和X120等级的候选人。使用以下参数制定了将上述两种组合物加工成API X100和X120牌号的TMCP时间表； （1）再加热温度在1180℃至1200℃之间； （2）粗轧起始温度为1000℃；（3）精轧总压下率为2 70％，起始温度为820℃。 （4）加速冷却，最终温度为415，冷却速度为20℃/ s。两种钢的显微组织均为下贝氏体，并带有马氏体/奥氏体（MA）岛。结果发现，MA岛的大小和分布显然与贝氏体转变温度和时间有关，可能会显着影响钢的强度。

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