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STRESS CORROSION CRACKING OF STEELS IN AMMONIA.

Author(s) : CRACKNELL A.

Type of article: Periodical article

Summary

RUPTURE OCCURS WHEN STEEL IS STRESSED BEYOND ITS YIELD STRESS. STRONG CORRODENTS OBVIOUSLY REDUCE THE THICKNESS OF STEEL, THUS CREATING YIELD CONDITIONS. BUT SOME MILD CORRODENTS APPEAR TO ACTUALLY LOWER THE YIELD STRESS AT CERTAIN POINTS, NOTABLY WHERE LOCAL HIGH STRESSES OCCUR SUCH AS AT WELDS OR BENDS. THE CORRODENTS CONCERNED DEPEND ON THE METAL AND WITH CARBON STEELS AMMONIA CONTAMINATED WITH OXYGEN CAN CAUSE PROBLEMS. SOME LABORATORY TESTS INDICATE THAT THE PRESENCE OF WATER MAY INHIBIT THIS EFFECT, BUT FIELD RESULTS THROW DOUBTS ON THEIR VALIDITY. FAILURE IS MOST LIKELY TO OCCUR ON HIGH SIDE COMPONENTS BUT THE REPORTED CASES ARE MINIMAL. MOST REPORTED PROBLEMS HAVE OCCURRED IN AMMONIA TRANSPORT OR STORAGE TANKS. D.W.H.

Details

  • Original title: STRESS CORROSION CRACKING OF STEELS IN AMMONIA.
  • Record ID : 1983-0303
  • Languages: English
  • Source: Inst. Refrig., Adv. Proof - 4 p.; 1 fig.; 1 tabl.; 9 ref.
  • Publication date: 1982/05/06
  • Document available for consultation in the library of the IIR headquarters only.

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