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Mercury Liquid Metal Embrittlement of ASTM Grade 29 Titanium

Picture for Mercury Liquid Metal Embrittlement of ASTM Grade 29 Titanium
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Results of exposing UNS R56404 forging and pipe product forms to liquid mercury over the 25°-232°C range while highly stressed at & beyond the alloy’s yield point via three  loading modes are reported. Included are: sustained load 90 day C-ring tests, slow strain rate tensile testing, and rippled slow strain rate cyclic tensile loading.

 

Product Number: 51316-7556-SG
ISBN: 7556 2016 CP
Author: Ronald Schutz
Publication Date: 2016
Industry: Science of Corrosion
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$20.00
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Liquid mercury can be a natural component of natural gas, condensate, and crude oil production streams, so the potential for liquid metal embrittlement (LME) of hydrocarbon production metallic components must be considered. With increasing use of titanium alloys for deep sour high pressure/high temperature well oil country tubular goods (OCTG) and dynamic offshore riser components, titanium’s ability to resist degradation from liquid mercury contact warranted assessment under relevant hydrocarbon production conditions. The results of exposing UNS R56404 forging and pipe product forms to liquid mercury over the 25°-232°C temperature range while highly stressed at and beyond the alloy’s yield point via three differing loading modes are reported. These included sustained load 90 day C-ring tests, slow strain rate tensile testing, and rippled slow strain rate cyclic tensile loading. Although excessive plastic strain can allow substrate Ti metal wetting and low energy subcritical crack growth (i.e., LME), results confirm that titanium’s robust, non-mercury wetting surface oxide film is key to providing LME resistance to substantial plastic strain limits and beyond a reasonable range of surface mechanical damage expected in service.

Key words: titanium, titanium alloy, liquid metal, mercury, liquid metal embrittlement, rippled slow strain rate

 

 

Liquid mercury can be a natural component of natural gas, condensate, and crude oil production streams, so the potential for liquid metal embrittlement (LME) of hydrocarbon production metallic components must be considered. With increasing use of titanium alloys for deep sour high pressure/high temperature well oil country tubular goods (OCTG) and dynamic offshore riser components, titanium’s ability to resist degradation from liquid mercury contact warranted assessment under relevant hydrocarbon production conditions. The results of exposing UNS R56404 forging and pipe product forms to liquid mercury over the 25°-232°C temperature range while highly stressed at and beyond the alloy’s yield point via three differing loading modes are reported. These included sustained load 90 day C-ring tests, slow strain rate tensile testing, and rippled slow strain rate cyclic tensile loading. Although excessive plastic strain can allow substrate Ti metal wetting and low energy subcritical crack growth (i.e., LME), results confirm that titanium’s robust, non-mercury wetting surface oxide film is key to providing LME resistance to substantial plastic strain limits and beyond a reasonable range of surface mechanical damage expected in service.

Key words: titanium, titanium alloy, liquid metal, mercury, liquid metal embrittlement, rippled slow strain rate

 

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10294 Mercury Liquid Metal Embrittlement of Alloys for Oil and Gas Production and Processing

Product Number: 51300-10294-SG
ISBN: 10294 2010 CP
Author: Raymundo Case and Dale R. McIntyre
Publication Date: 2010
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This paper reports liquid metal embrittlement (LME) test results for a variety of common oilfield and processing plant alloys exposed to liquid mercuryp across a range of temperatures. Test methods used include slow strain rate testing and C-ring tests.
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Mercury Liquid Metal Embrittlement Testing of Oil and Gas Production Alloys

Product Number: 51314-3993-SG
ISBN: 3993 2014 CP
Author: Stefanie Asher
Publication Date: 2014
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 Liquid metal embrittlement (LME) involves penetration of a liquid metal into a solid metal that leads to brittle fracture. A test program was established to evaluate the susceptibility of various metallic materials to LME by mercury.
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51313-02519-Liquid Metal Embrittlement Testing of Various Alloys for Oil and Gas Production

Product Number: 51313-02519-SG
ISBN: 02519 2013 CP
Author: Stefanie Asher
Publication Date: 2013
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