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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Careful examination is recommended for correct diagnosis of the cause of failure. A suggested test apparatus capable of maintaining solution concentration and temperature within the prescribed limits for extended periods of time is also described herein. Quality Assurance Return to Corrosion Testing.
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. The test may not be relevant to stress-corrosion cracking in polythionic acid or caustic environments. Black lines indicate the approximate location of the outer surface of the tube. Etching both sections did not reveal any additional crack depth as sometimes occurs in metallographic studies of stress-corrosion cracking.
The boiling points of aqueous magnesium chloride solutions at one atmosphere pressure as a function of concentration are shown graphically in Fig. The test specimens were immersed in the boiling solution and supported using the suggested ladder-back cradles.
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 Microphotographs of the deepest cracks found on the mounted sections are shown in Figures 3 and 4.
The boiling points of aqueous magnesium chloride solutions at one atmosphere pressure as a function of concentration are shown graphically in Fig.
CTL-ASTM G36 – STRESS CORROSION CRACKING in a BOILING MAGNESIUM CHLORIDE SOLUTION
No preparation other than deburring and degreasing was performed on the test specimens prior to testing. 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.
Photographs of typical appearance of the cracks on both tubes are shown in Figures 1 and 2.
Circumferential cracks with connecting longitudinal crack in base metal of bare tube. It is a method for detecting the effects of composition, heat treatment, surface finish, microstructure, and stress on the susceptibility of these materials asmt chloride stress corrosion cracking.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not y36 as part of the standard. 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.
See Section 7 for specific safety precautions. Link to Active This link will always route to the current Active version of the standard. It is the responsibility of the user of this standard to establish appropriate safety and health 3g6 and determine the applicability of regulatory limitations prior to use.
Crack characteristics were investigated by preparing metallographic sections of the test specimens. Newark, Delaware USA 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. Link to Active This link will always route to the current Active version of the standard. Deepest cracks found on transverse cross-section of finned tube.
Referenced Documents purchase separately The documents listed astj are referenced within the subject standard but are not provided as part of the standard. On the finned test specimen, cracks extended down the fins from the outer asgm 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 awtm stopping before the next fin was encountered.
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. Deepest crack found on longitudinal cross-section of bare tube. Historical Version s – view previous versions of standard.
Corrosion Testing Laboratories, Inc.
Revised ASTM G36 apparatus
Materials that normally provide acceptable resistance in hot chloride service may crack in this test. See Section 7 for specific safety precautions. Both test specimens were taken off test at 8 hours for examination at low magnification.