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. Newark, Delaware USA Although this test may be performed using various concentrations of magnesium chloride, this procedure covers a test solution asttm at a constant boiling temperature of 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.
This danger is particularly great when small cross section atsm, high applied stress levels, long exposure periods, stress-corrosion resistant alloys, or a combination thereof are being used.
The test specimens were immersed in the boiling solution and supported using the suggested ladder-back cradles. Deepest crack found on longitudinal cross-section of bare tube.
Astk to Corrosion Testing. 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.
The weld and HAZ of the finned tube appeared astj have more cracks than the base metal, and the cracks appear to nearly connect from fin to fin. A suggested test apparatus capable of maintaining solution concentration and temperature within the prescribed limits for extended periods of time is also described herein.
Link to Active This link wstm always route to the current Active version of the standard.
CTL-ASTM G36 – STRESS CORROSION CRACKING in a BOILING MAGNESIUM CHLORIDE SOLUTION
Accompanying paperwork states that both types of tube were fabricated from the same heat lot of material. 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 Test procedures conformed to the referenced ASTM test method. However, such correlations may not always be possible.
Etching both sections did not reveal any additional crack depth as sometimes occurs in metallographic studies of stress-corrosion cracking. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Active view current version of standard. The boiling points of aqueous magnesium chloride solutions at one atmosphere pressure as a function of concentration are shown graphically in Fig.
Two 2 1-foot long pieces of 0. Historical Version s – view previous versions of standard. See Section 7 for specific safety precautions.
Microphotographs of the deepest cracks found on the mounted sections are shown in Figures 3 and 4. Both test specimens were taken off test at 8 hours for examination at low magnification. Quality Assurance Return to Corrosion Testing. Deepest cracks found on transverse cross-section of finned tube.
Cracking of both test specimens was observed, and the tests were terminated. Circumferential cracks with connecting longitudinal crack in base metal of bare tube. Materials that normally provide acceptable resistance in hot chloride service may crack in this test. It is a method for detecting the effects of composition, heat ashm, surface finish, microstructure, and stress on the susceptibility of these materials to chloride stress corrosion cracking.
ASTM G36 – 94(2013)
The 3g6 points of aqueous magnesium chloride solutions at one atmosphere pressure as a function of concentration are shown graphically in Fig. 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.
See Section 7 for specific safety precautions. 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 before the next fin was encountered.
Photographs of typical appearance of the cracks on both tubes are shown in Figures 1 and 2.
Black lines indicate the approximate location of the outer surface of the tube. This leads to the possibility of confusing stress-corrosion failures with mechanical failures induced by corrosion-reduced net cross sections.
Corrosion Testing Laboratories, Inc. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. No preparation other than deburring and degreasing was performed on the test specimens prior to testing. Regular examination periods for test specimen cracking were scheduled. 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.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Link to Active This link will always route to the current Active version of the standard. Crack characteristics were investigated by preparing metallographic sections of the test specimens. The test may not be relevant to stress-corrosion cracking in polythionic acid or caustic environments.