Corrosion testing type HP 9-4-20-steel

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Forged HP 9-4-20 steel exhibits a high yield strength (1240 MPa (180 ksi)), a high fracture toughness (K/sub Ic/) (120 MN/m/sup 3/2/ (110 ksi ..sqrt..in)), in good weldability. The alloy was studied to determine some of its corrosion and stress-corrosion characteristics, especially after welding. Potentiodynamic-polarization studies established that pitting of the steel was most severe when the chloride ion concentration was high and the pH of the solution was low. Higher potentials (approaching 1 V) caused increased corrosion rates also. Pitting of the welded samples was not preferential to any part of the weld and was uniform on both the ... continued below

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Pages: 26

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Dobbins, A.G.; Koger, J.W. & Mustaleski, T.M. Jr. February 20, 1979.

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Forged HP 9-4-20 steel exhibits a high yield strength (1240 MPa (180 ksi)), a high fracture toughness (K/sub Ic/) (120 MN/m/sup 3/2/ (110 ksi ..sqrt..in)), in good weldability. The alloy was studied to determine some of its corrosion and stress-corrosion characteristics, especially after welding. Potentiodynamic-polarization studies established that pitting of the steel was most severe when the chloride ion concentration was high and the pH of the solution was low. Higher potentials (approaching 1 V) caused increased corrosion rates also. Pitting of the welded samples was not preferential to any part of the weld and was uniform on both the base metal and weld. Dead-weight stress-corrosion tests demonstrated that welding did not increase susceptibility of the alloy to stress corrosion. The specimens failed in a ductile manner from the increased tensile load as the cross-sectional area was reduced by dissolution of the metal in the corrosive solution.

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Pages: 26

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Dep. NTIS, PC A03/MF A01.

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  • Report No.: Y-2168
  • Grant Number: W-7405-ENG-26
  • DOI: 10.2172/6348995 | External Link
  • Office of Scientific & Technical Information Report Number: 6348995
  • Archival Resource Key: ark:/67531/metadc1210816

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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Creation Date

  • February 20, 1979

Added to The UNT Digital Library

  • July 5, 2018, 11:11 p.m.

Description Last Updated

  • Aug. 8, 2018, 1:09 p.m.

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Dobbins, A.G.; Koger, J.W. & Mustaleski, T.M. Jr. Corrosion testing type HP 9-4-20-steel, report, February 20, 1979; United States. (digital.library.unt.edu/ark:/67531/metadc1210816/: accessed January 19, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.