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Thermo-mechanical Control Process as a Tool to Grain-refine the Low Manganese Containing Steel for Sour Service Line Pipe

机译:热机械控制工艺作为酸性服务管线管中低锰含量钢的晶粒细化工具

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摘要

This study confirms the effect of lowering manganese (Mn) content of sour service line pipe steels on improving the resistance to hydrogen induced blister cracking (HIBC), following which thermo-mechanical control process (TMCP) is considered as an effective tool to strengthen and toughen the low manganese steels. The HIBC is preventable when the Mn content is less than 0.4mass% even for the steels containing an order higher sulfur than latest ordinary steels for sour service. After confirming the effect of lowering Mn, the Mn content is estimated to obtain the required strength for line pipe steels. Presupposing ordinary rolling facilities available for the TMCP, 0.5mass% of Mn is necessary to strengthen a steel microalloyed with Nb and Ti. Applying heavy reduction (60%) and rapid cooling (80℃/s) to the 0.5Mn-Nb-Ti steel refines the microstructure and consequently improves simultaneously both yield strength and Charpy transition temperature. As a result of studying the TMCP variables to achieve such grain-refinement, necessary TMCP conditions to obtain the better strength-transition temperature balance are the rolling finish temperature higher than the Ar_3 transformation temperature of the steel, the heavy reduction which accumulates equivalent strain of more than 0.9 at 850℃, and the rapid cooling rate of more than 60℃/s.
机译:这项研究证实了降低酸性管线钢中锰的含量对提高抗氢诱发的水泡开裂(HIBC)的作用,然后热机械控制工艺(TMCP)被认为是一种有效的强化和强化工具。使低锰钢坚韧。当Mn含量低于0.4mass%时,即使对于硫来说,其硫含量也比最新普通钢高出一个数量级,也可以防止HIBC。在确认了降低Mn的效果后,可以估算Mn含量以获得管线钢所需的强度。以TMCP可用的普通轧制设备为前提,需要0.5%(质量)的Mn来增强用Nb和Ti微合金化的钢。对0.5Mn-Nb-Ti钢进行大减量(60%)和快速冷却(80℃/ s)可以改善组织,从而同时提高屈服强度和夏比转变温度。通过研究TMCP变量以实现晶粒细化,获得更好的强度-转变温度平衡的必要TMCP条件是:轧制终轧温度高于钢的Ar_3相变温度;大的压下量积累了钢的等效应变。 850℃时大于0.9,快速冷却速度大于60℃/ s。

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