Presented in this report are the results of stress corrosion cracking testing per ASTM G36 (Standard Practice for Performing Stress-Corrosion Cracking Tests in a. austenitic stainless steel was studied in accordance with the ASTM G The samples were unidirectional cold-rolled up to 60 and 90 percent reduction in. Revised ASTM G36 apparatus. This client had been testing stress corrosion- cracking in metal welds by clamping a QVF 2″ glass pipe fitting to his samples.
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Microphotographs of the deepest cracks found on the mounted sections are shown in Figures 3 and 4.
Although this test may be performed using various concentrations of magnesium chloride, this procedure covers a test solution held at a constant boiling temperature of It is the responsibility of the user of this standard to establish appropriate safety g6 health practices and determine the applicability of regulatory limitations prior to use. Newark, Delaware USA Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
It is a method for detecting the effects of composition, heat treatment, surface finish, microstructure, and stress on the susceptibility of these materials to chloride stress corrosion cracking. Crack characteristics were investigated by preparing metallographic sections of the test specimens. Deepest cracks found on transverse cross-section of finned tube.
See Section 7 for specific safety precautions. Careful examination is recommended for correct diagnosis of the cause of failure. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
Materials that normally provide acceptable resistance in hot chloride service may crack in qstm test.
ASTM G36 – 94(2013)
On the finned test specimen, cracks extended down the fins from the outer edge to the tube wall in a direction roughly normal to the tube wall; at the tube wall the cracks extended in a short arc both longitudinally and circumferentially, the arcs stopping aastm the next fin was encountered. Active view current version of standard.
It is a method for detecting the effects of composition, heat treatment, surface finish, microstructure, and stress on the susceptibility of these materials to chloride stress corrosion cracking. Test procedures conformed to the referenced ASTM test method.
CTL-ASTM G36 – STRESS CORROSION CRACKING in a BOILING MAGNESIUM CHLORIDE SOLUTION
Although this test may be performed using various concentrations of magnesium chloride, this procedure covers a test solution held at a constant boiling temperature of However, such correlations may not always be possible.
Circumferential cracking of the bare tube test specimen was apparent within the first 8 hours of testing even while the test specimen was on test. The test may not be relevant to stress-corrosion cracking in polythionic acid or caustic environments. Circumferential cracks with connecting longitudinal crack in base metal of bare tube.
It was decided that cracks in the bare tube could be best examined using a longitudinal cross-section, while the cracks in the finned tube could be best examined using a transverse cross-section.
The weld and HAZ of the finned tube appeared to have more cracks than the base metal, and the cracks appear to nearly connect from fin to fin. Both test specimens were taken off test at 8 hours for examination at low magnification. The boiling points of aqueous magnesium chloride solutions at one atmosphere pressure as a function of concentration are shown graphically in Fig.
The boiling points of aqueous magnesium chloride solutions at one atmosphere pressure as a function of concentration aatm shown graphically in Fig.
Corrosion Testing Laboratories, Inc. Black lines indicate the approximate location of the outer surface of the tube.
This danger is particularly great when small cross section samples, high applied stress levels, long exposure periods, stress-corrosion resistant alloys, or a combination thereof are being used. A suggested test apparatus capable of maintaining solution concentration and atm within the prescribed limits for extended periods of time is also described herein. The test specimens were immersed in the boiling solution and supported using the suggested ladder-back cradles.
Cracking of both test specimens was observed, and the tests were terminated. No preparation other than deburring and degreasing was performed on the test specimens prior to testing. Return to Corrosion Testing. Deepest crack found on longitudinal cross-section of bare tube. Link to Active This link will always route to the current Active version of the standard.