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首页> 外文期刊>ISIJ international >Metallurgical Conditions Required for Superior Hot-workability of 13% Chromium Steels in a Seamless Rolling Process
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Metallurgical Conditions Required for Superior Hot-workability of 13% Chromium Steels in a Seamless Rolling Process

机译：无缝轧制过程中13％铬钢卓越热加工性所需的冶金条件

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摘要

Hot-workability of 13% Cr steels was investigated in terms of microstructure by model elongator rolling tests and by tensile tests to develop modified types of 13% Cr steel seamless OCTGs (Oil Country Tubular Goods). Hot-workability deteriorated in both tests by the formation of δ-ferrite in austenite (γ) matrix; however, the deterioration occurred at lower temperatures in tensile tests than in model elongator tests. Materials are deformed more heavily in the latter than in the former, which is considered to be the cause of the difference. The result suggests that lower temperatures than the actual rolling temperature should be selected for the tensile tests in order to evaluate hot-workability of materials for seamless pipes. δ phase fraction during hot-working was almost equal to that estimated from the experimental phase diagram at a deformation temperature for plain C-13%Cr steels and at a primary heating temperature for Ni containing low C-13%Cr steels. This phenomenon is explained by a difference in the diffusion coefficient of C and that of Ni. Furthermore, it was clarified that isolated distribution and polygonal shape of δ prevented void-propagation during hot-working and was not harmful to hot-workability in plain C-13%Cr steels.
机译：通过模型拉长机轧制试验和拉伸试验，研究了13％Cr钢的热加工性，以开发改进类型的13％Cr钢无缝OCTG（石油国家管状物品）。在两种测试中，由于在奥氏体（γ）基质中形成δ-铁素体，热加工性能均降低。但是，与拉伸试验相比，拉伸试验在较低的温度下会发生变质。与前者相比，后者的材料变形更严重，这被认为是造成这种差异的原因。结果表明，应选择比实际轧制温度低的温度进行拉伸试验，以评估无缝管材料的热加工性能。对于普通C-13％Cr钢，在变形温度下，对于初生加热温度，对于低含量C-13％Cr钢，δ的热加工过程中的δ相分数几乎等于根据实验相图估算的。这种现象是由于C和Ni的扩散系数不同而引起的。此外，明确了δ的孤立分布和多边形形状防止了热加工过程中的空孔扩展，并且对普通C-13％Cr钢的热加工性无害。

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