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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Stress Corrosion Cracking Testing: ASTM G36, G37, G, & G
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 boiling points of aqueous magnesium chloride solutions at one atmosphere pressure as a function of concentration are shown graphically in Fig.
Newark, Delaware USA On the astj 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 atsm cracks extended in a short arc both longitudinally and circumferentially, the arcs stopping before the next fin was encountered.
Return to Corrosion Testing. The boiling points of aqueous magnesium chloride solutions at one atmosphere pressure as a function of concentration are shown graphically in Fig. Historical Version s – view previous versions of standard. The weld and HAZ of the finned tube appeared to have more cracks f36 the base metal, and the cracks appear to nearly connect from fin to fin.
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 Both test specimens were taken off test at 8 hours for examination at low magnification.
Microphotographs of the sstm cracks found on the mounted sections are shown in Figures 3 and 4. The test may not be relevant to stress-corrosion cracking in polythionic acid or caustic environments. No preparation other than deburring and degreasing was performed on the test specimens prior to testing. Active view current version of standard. Cracking of both test specimens was observed, and the tests were terminated. Deepest cracks found on transverse cross-section of finned tube.
CTL-ASTM G36 – STRESS CORROSION CRACKING in a BOILING MAGNESIUM CHLORIDE SOLUTION
A suggested test apparatus capable of maintaining solution concentration and temperature within the prescribed limits for extended periods of time is also described herein. See Section 7 for specific safety precautions.
Two 2 1-foot long pieces of 0.
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. Black lines indicate the approximate location of the outer surface of the tube. However, such correlations may not gg36 be possible. Aastm to Active This link will always route to the current Active version of the standard. Etching both sections did not reveal any additional crack depth as sometimes occurs g63 metallographic studies of stress-corrosion cracking.
Photographs of typical appearance of the cracks on both tubes are shown in Figures 1 and 2. The test specimens were immersed in the boiling solution and supported using the suggested ladder-back cradles. Link to Active This link will always route to the current Active version of the standard. 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 leads to the possibility of confusing stress-corrosion failures astj mechanical failures induced by corrosion-reduced net cross sections.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. 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 Corrosion Testing Laboratories, Inc. Test procedures conformed to the referenced ASTM test method.
Careful examination is recommended for correct diagnosis of the cause of failure. Deepest crack found on gg36 cross-section of bare tube. Materials that normally provide acceptable resistance in astn chloride service may crack in this test.
It is the responsibility of the user g63 this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Crack characteristics were investigated by preparing metallographic sections of the test specimens.
ASTM G36 – 94(2013)
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.
See Section 7 for specific safety precautions. Quality Assurance Return to Corrosion Testing. It is a method for detecting the effects of composition, heat treatment, surface finish, microstructure, and stress on the susceptibility of astk materials to chloride stress corrosion cracking. Circumferential cracks with connecting longitudinal crack in base metal of bare 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. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Accompanying paperwork states that both types of tube were fabricated from the same heat lot of material. Regular examination periods for test specimen cracking were scheduled.