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Title: The chloride stress corrosion cracking behavior of beryllium copper and other nonmagnetic drill collar alloys

Abstract

Nonmagnetic drill collars and other structural components are used to provide a region in the bottom hole assembly near the bit in which sensitive magnetic measurements can be made. Beryllium copper, Cl7200, is paramagnetic with low magnetic permeability which makes it aptly suited for nonmagnetic components. Not only are the magnetic properties of the alloys for these components important, but the integrity of the alloys under dynamic loading in a range of hostile drilling fluids is critical as well. Chlorides in certain drilling muds can cause unpredictable stress corrosion cracking (SCC) of susceptible alloys. In a standard test for chloride SCC, ASTM G 36-73, beryllium copper, Cl7200, showed no failure after 1000 hr of exposure to boiling 45 weight percent magnesium chloride solution. The applied stresses were 100 percent of the 0.2 percent offset yield strength for the alloy. Failures for austenitic stainless steels generally occurred in less than 200 hr in this environment at applied stresses of 25 percent of the yield strength. Although benefits can be obtained by controlling the environment and introducing residual compressive stresses to austenitic stainless steel components, these remedies cannot permanently eliminate the underlying susceptibility of these alloys to chloride SCC. Beryllium copper ismore » immune to chloride SCC.« less

Authors:
Publication Date:
OSTI Identifier:
7005640
Report Number(s):
CONF-870314-
Resource Type:
Conference
Resource Relation:
Conference: Corrosion '87, San Francisco, CA, USA, 9 Mar 1987
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BERYLLIUM ALLOYS; CORROSION RESISTANCE; STRESS CORROSION; COPPER ALLOYS; DRILLING FLUIDS; CORROSIVE EFFECTS; MAGNESIUM CHLORIDES; STAINLESS STEELS; AUSTENITIC STEELS; BINARY ALLOY SYSTEMS; BOILING; COMPRESSION STRENGTH; CRACK PROPAGATION; DESTRUCTIVE TESTING; DRILLS; FRACTURE MECHANICS; SLEEVES; YIELD STRENGTH; ALKALINE EARTH METAL COMPOUNDS; ALLOY SYSTEMS; ALLOYS; CHEMICAL REACTIONS; CHLORIDES; CHLORINE COMPOUNDS; CHROMIUM ALLOYS; CORROSION; CORROSION RESISTANT ALLOYS; DRILLING EQUIPMENT; EQUIPMENT; FLUIDS; HALIDES; HALOGEN COMPOUNDS; IRON ALLOYS; IRON BASE ALLOYS; MAGNESIUM COMPOUNDS; MATERIALS TESTING; MECHANICAL PROPERTIES; MECHANICS; PHASE TRANSFORMATIONS; STEELS; TESTING; 360105* - Metals & Alloys- Corrosion & Erosion; 360103 - Metals & Alloys- Mechanical Properties

Citation Formats

Turn, Jr, J C. The chloride stress corrosion cracking behavior of beryllium copper and other nonmagnetic drill collar alloys. United States: N. p., 1987. Web.
Turn, Jr, J C. The chloride stress corrosion cracking behavior of beryllium copper and other nonmagnetic drill collar alloys. United States.
Turn, Jr, J C. 1987. "The chloride stress corrosion cracking behavior of beryllium copper and other nonmagnetic drill collar alloys". United States.
@article{osti_7005640,
title = {The chloride stress corrosion cracking behavior of beryllium copper and other nonmagnetic drill collar alloys},
author = {Turn, Jr, J C},
abstractNote = {Nonmagnetic drill collars and other structural components are used to provide a region in the bottom hole assembly near the bit in which sensitive magnetic measurements can be made. Beryllium copper, Cl7200, is paramagnetic with low magnetic permeability which makes it aptly suited for nonmagnetic components. Not only are the magnetic properties of the alloys for these components important, but the integrity of the alloys under dynamic loading in a range of hostile drilling fluids is critical as well. Chlorides in certain drilling muds can cause unpredictable stress corrosion cracking (SCC) of susceptible alloys. In a standard test for chloride SCC, ASTM G 36-73, beryllium copper, Cl7200, showed no failure after 1000 hr of exposure to boiling 45 weight percent magnesium chloride solution. The applied stresses were 100 percent of the 0.2 percent offset yield strength for the alloy. Failures for austenitic stainless steels generally occurred in less than 200 hr in this environment at applied stresses of 25 percent of the yield strength. Although benefits can be obtained by controlling the environment and introducing residual compressive stresses to austenitic stainless steel components, these remedies cannot permanently eliminate the underlying susceptibility of these alloys to chloride SCC. Beryllium copper is immune to chloride SCC.},
doi = {},
url = {https://www.osti.gov/biblio/7005640}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Jan 01 00:00:00 EST 1987},
month = {Thu Jan 01 00:00:00 EST 1987}
}

Conference:
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