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Steel cleanness requirements for X65 to X80 electric resistance welded linepipe steels

机译：X65至X80电阻焊管线钢的钢清洁度要求

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摘要

In Australia, a large proportion of the gas pipelines traverse rural areas of low population density with considerable distances between population centres. As these pipelines transport non-sour gas, there have been considerable economic advantages to be gained from the use of thin walled, small diameter, high strength linepipe grades. The successful development of these X65 to X80 grades has required a balance to be constantly maintained between process parameters, alloy design constraints and quality control measures. This paper considers this mixture of metallurgical and processing challenges in the context of steel cleanness. The steelmaking and casting processes are required to not only produce a low volume fraction of suitably morphology modified inclusions, but also to ensure their dispersion in cast and hot rolled structures. Critical in the achievement of these aims was found to be the order in which calcium treatment and vacuum processing of the liquid steel are carried out. As these steels are complex microalloyed grades, the clean steel concept was extended to include the composition and precipitation of the carbide and nitride species. This broad approach to steel cleanness was achieved while also maintaining a narrow range of casting temperature and chemical composition.
机译：在澳大利亚，大部分天然气管道穿越人口密度低的农村地区，人口中心之间的距离相当远。当这些管道输送非酸性气体时，使用薄壁，小直径，高强度管道等级将获得可观的经济优势。这些X65至X80等级的成功开发要求在工艺参数，合金设计限制和质量控制措施之间保持平衡。本文在钢铁清洁度的背景下考虑了冶金和加工挑战的混合。炼钢和铸造工艺不仅需要产生少量体积的适当形态改性的夹杂物，而且还需要确保它们在铸造和热轧结构中的分散。发现实现这些目的的关键是对钢水进行钙处理和真空处理的顺序。由于这些钢是复杂的微合金级，因此清洁钢的概念已扩展到包括碳化物和氮化物种类的组成和析出。实现了这种广泛的钢清洁方法，同时还保持了较窄的铸造温度和化学成分范围。

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