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Abstract:
It has been clarified that the causes of stress corrosion cracking of conventional manganese-chromium steel for nonmagnetic drill collars are low corrosion resistance of the matrix, sensitization and residual stress. Based on this finding, an extralow-carbon, extralow-nitrogen 34%Ni-20%Cr-2%Ti-0.5%Al steel of the gamma-prime precipitation strengthening type with low residual stress has been developed by adding nickel, an element which is effective in increasing the stress corrosion cracking resistance. The new steel is free from stress corrosion cracking in high-temperature, high-concentration chloride environments in which the conventional steel is subject to severe stress corrosion cracking. In addition, its corrosion fatigue strength is not influenced by environments. Because the new steel retains its high strength at temperatures up to 300 C and residual stresses induced in it is low, it is expected to offer excellent resistance to stress corrosion cracking under practical service conditions.
| Description: |
Journal Article |
| Pages: |
7 |
| Report Date: |
JAN 89 |
| Report Number: |
D221141 |
Report Unavailable |
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