Pitting corrosion resistance properties of super duplex stainless steel weld metals and influencing factors
Pitting corrosion resistance properties of super duplex stainless steel weld metals and influencing factors
复制标题
超级双相不锈钢焊缝金属的耐点蚀性能及影响因素
DOI：
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发表时间：
2018
影响因子：
2.1
通讯作者：
Alex Malioglou
中科院分区：
文献类型：
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作者：
Zhuyao Zhang;V. van der Mee;M. Golding;Jordi Donate;Alex Malioglou
超级双相不锈钢具有良好的强度、低温韧性和良好的腐蚀性能，特别是抗点蚀性能，在近海-陆上油气工业和石化工业中得到了广泛的应用。同时，由于焊接热过程的特殊性，超双相焊缝金属在焊态条件下，与母材相比，腐蚀性能往往较差。然而，为了最大限度地提高使用超级双相钢建造的加工设施的性能能力，石油公司一直在不断尝试将焊缝金属所需的点蚀温度提高到越来越具有挑战性的水平。这使得相关焊材的设计变得更加困难。本文通过优化合金化设计，使焊缝金属能一致满足各种规格的要求，探索可能的解决方案。这包括一个平衡的合金化系统，它将提供良好的抗点蚀性能(通常表示为高临界点蚀温度)，同时仍能够保持足够的机械性能，特别是低温冲击韧性。研究和讨论了可能对这些性能有相当大影响的主要方面。
Thanks to the excellent combination of strength, low temperature toughness, and good corrosion properties, particularly resistance to pitting corrosion attack, super duplex stainless steels have found wide applications in the offshore–onshore oil and gas industries and petrochemical industries. In the meantime, due to the special thermal process of welding, super duplex weld metals in the as-welded condition, when comparing with the base steels, always show considerably inferior corrosion properties. However, in order to maximize the performance capability of processing facilities built with super duplex steels, oil companies have been continuously trying to push the required pitting temperature for weld metals to more and more challenging levels. This has made the design of relevant welding consumables even more difficult. This paper explores the possible solution through optimizing the alloying design so that the weld metals can consistently meet the increased requirements of various specifications. This includes a balanced alloying system that will provide good pitting corrosion resistance (typically expressed as high critical pitting temperatures) while is still capable to maintain adequate mechanical properties, particularly low temperature impact toughness. Major aspects that may have considerable influence on these properties are investigated and discussed.