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10290 Hydrogen Embrittlement Testing of High Strength Low Carbon Martensitic Steels

Picture for 10290 Hydrogen Embrittlement Testing of High Strength Low Carbon Martensitic Steels
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Product Number: 51300-10290-SG
ISBN: 10290 2010 CP
Author: Robert J. Conder, Peter Felton, Ray Burke and Philip Dent
Publication Date: 2010
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High strength carbon steels are being used as the external reinforcement for a novel composite pipeline. This system combines a thin wall corrosion resistant alloy with the reinforcement to produce a high pressure pipeline which is manufactured on site giving a lower cost alternative to conventional thick-wall pipelines. Despite the widely known susceptibility of high strength ferritic-bainitic carbon steels to hydrogen embrittlement, there is little published data on the hydrogen embrittlement behaviour of martensitic carbon steels. Therefore, a series of tests was performed to establish the risk of cracking in a buried condition where cathodic protection is applied. Tests were performed to establish the plateau hydrogen content and the hydrogen flux under various charging conditions, and then a series of slow strain rate and constant load tests performed under polarised conditions to establish any reduction in ductility over samples tested in air. Microscopy analysis of the fracture surfaces was performed to identify any change in the fracture morphology. A stressed full ring test of a sample of the composite pipeline was also tested under simulated cathodic protection conditions. The results of this testing are discussed and the implications for the use of this novel composite pipeline system evaluated.

KEYWORDS: Hydrogen embrittlement, martensitic, steel, testing, pipe, composite
High strength carbon steels are being used as the external reinforcement for a novel composite pipeline. This system combines a thin wall corrosion resistant alloy with the reinforcement to produce a high pressure pipeline which is manufactured on site giving a lower cost alternative to conventional thick-wall pipelines. Despite the widely known susceptibility of high strength ferritic-bainitic carbon steels to hydrogen embrittlement, there is little published data on the hydrogen embrittlement behaviour of martensitic carbon steels. Therefore, a series of tests was performed to establish the risk of cracking in a buried condition where cathodic protection is applied. Tests were performed to establish the plateau hydrogen content and the hydrogen flux under various charging conditions, and then a series of slow strain rate and constant load tests performed under polarised conditions to establish any reduction in ductility over samples tested in air. Microscopy analysis of the fracture surfaces was performed to identify any change in the fracture morphology. A stressed full ring test of a sample of the composite pipeline was also tested under simulated cathodic protection conditions. The results of this testing are discussed and the implications for the use of this novel composite pipeline system evaluated.

KEYWORDS: Hydrogen embrittlement, martensitic, steel, testing, pipe, composite
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Pipeline steels higher than API X80 grade ad subject to hydrogen embrittlement risk induced by the hydrogen evolution effect under cathodic protection. This paper focuses on the hydrogen embrittlement behaviors of API X70, X80 and X90 high strength pipeline steel under cathodic protection in soil simulation conditions.
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