What does the pitting resistance equivalent really tell us?

Cleland, J

doi:10.1016/1350-6307(95)00026-7

Cited by 32 publications

(11 citation statements)

References 3 publications

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“…Cleland 3 proposed two equations to relate the CPT to the PREN: According to equations (6) and (7) the base metal has CPT values 36.4 o C and 23.7 o C, respectively. The value measured (29.0 ± 3.0 o C) is placed between these two estimations.…”

Section: Resultsmentioning

confidence: 99%

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Influence of Microstructure on the Corrosion Resistance of AISI 317L (UNS S31703)

et al. 2017

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The AISI 317L stainless steel is an austenitic grade with at least 3%Mo. Recently, this steel has replaced AISI 316L in many applications in chemical and petrochemical industries, due to its higher pitting corrosion resistance. The microstructure of the hot rolled and annealed material studied in this work consists of austenitic grains and 4.0% of delta ferrite (δ) with elongated islands morphology. This microstructure was modified by three processes: cold rolling with 87% of reduction, aging at 450 o C for 400 h, and welding by gas tungsten arc welding (GTAW) process. The corrosion resistance was evaluated by anodic polarization tests (ASTM G-61) and critical pitting temperature tests (ASTM G-150). Cold rolling produced a microstructure consisting of elongated grains of austenite and martensite α', high dislocation density and the elongated islands of delta ferrite present in the annealed material. Welding produced a dendritic microstructure with 7.0% of delta ferrite and some σ precipitated in the ferrite. Finally, the aging at 450 o C for 400 h provoked the decomposition of ferrite. The results show that these microstructural changes affected the pitting corrosion resistance, as detected by ASTM G-61 and ASTM G-150 tests.

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Section: Resultsmentioning

confidence: 99%

“…The reaction can described as follows: According to some authors, the multiplication factor of nitrogen in formulae (1) is 30 for austenitic steels 1,3 . The PREN has been used for austenitic, ferritic, supermartensitic and austenitic-ferritic stainless steels, and nickel alloys.…”

Section: Introductionmentioning

confidence: 99%

Influence of Microstructure on the Corrosion Resistance of AISI 317L (UNS S31703)

et al. 2017

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“…It could be explained by the beneficial effect of Cr on pitting resistance equivalent of alloy steels. In chloride-containing aqueous solutions, Cr in alloy steels can improve pitting resistance and are well known as pitting resistance equivalent, but Ti is not beneficial for this property [17,22,23].…”

Section: In Chloride-containing 01 N H 2 Somentioning

confidence: 99%

Effect of Cr and Ti additions on the corrosion behavior of Fe3Al alloys in chloride-containing sulfuric acid solutions

Luu

Chiang

2005

Materials Letters

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“…Os AISD se destacam por possuírem um Pitting Resistance Equivalent Number (PREN) elevado. Vários autores [1,2,3] mostraram que o PREN para os AISD estão em valores superiores a 40, ao passo que para os AID o PREN é de 30 a 40 em sua maioria. Apesar dos AISD possuírem elevada resistência à corrosão, na exploração de petróleo e gás onde esse material é usado em tubulações para condução de água do mar, são recorrentes os casos de corrosão que resultam em perfurações.…”

Section: Introductionunclassified

ANÁLISE MICROESTRUTURAL EM TUBOS DE AÇO INOXIDÁVEL SUPERDUPLEX COM REVESTIMENTO DE INCONEL COMO REPARO PARA PERFURAÇÕES POR CORROSÃO LOCALIZADa

Kugizaki¹,

Drago²,

Souza³

et al. 2019

ABM Proceedings

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ResumoOs aços inoxidáveis superduplex são frequentemente utilizados em plataformas de extração de petróleo, para condução de água do mar em sistemas de arrefecimento, e combinam boa resistência mecânica e alta resistência à corrosão. Ainda que apresentam propriedades superiores aos demais aços inoxidáveis, os superduplex apresentam casos de perfuração por corrosão, necessitando reparos. Em alternativa ao reparo convencional, que é feito por meio de bandagem polimérica, este trabalho traz o estudo e análise detalhada do reparo por meio do revestimento da região afetada com uma camada de Inconel por meio de Cladding, utilizando processo GMAW. Foram realizados acompanhamento da temperatura e sinais elétricos durante o procedimento do depósito, além de análise detalhada da microestrutura e ensaios de microdureza nas regiões críticas. Os resultados demonstraram que a técnica de reparo por deposição de Inconel é viável, sem prejudicar as propriedades do tubo. Palavras-chave: Superduplex; Revestimento; Corrosão; GMAW. MICROSTRUCTURAL ANALYSIS IN SUPERDUPLEX STAINLESS STEEL PIPES WITH INCONEL CLADDING AS REPAIR FOR LOCAL CORROSION PERFORATIONS AbstractSuperduplex stainless steels are often used on oil extraction platforms, for conducting seawater in cooling systems, and combine good mechanical strength and high corrosion resistance. Although they have properties superior to the other stainless steels, the superduplex presents cases of perforation by corrosion, needing repairs. As an alternative to conventional repair, which is done by means of polymeric banding, this work brings the detailed study and analysis of the repair by coating the affected region with an Inconel layer using Cladding, with GMAW process. Temperature and electrical signals were monitored during the deposition procedure, as well as a detailed analysis of the microstructure and microhardness tests in the critical regions. The results demonstrated that the Inconel deposition repair technique is feasible, without impairing the properties of the pipe.

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What does the pitting resistance equivalent really tell us?

Cited by 32 publications

References 3 publications

Influence of Microstructure on the Corrosion Resistance of AISI 317L (UNS S31703)

Influence of Microstructure on the Corrosion Resistance of AISI 317L (UNS S31703)

Effect of Cr and Ti additions on the corrosion behavior of Fe3Al alloys in chloride-containing sulfuric acid solutions

ANÁLISE MICROESTRUTURAL EM TUBOS DE AÇO INOXIDÁVEL SUPERDUPLEX COM REVESTIMENTO DE INCONEL COMO REPARO PARA PERFURAÇÕES POR CORROSÃO LOCALIZADa

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