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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The weld and HAZ of the finned tube astn to have more cracks than the base metal, and the cracks appear to nearly connect from fin to fin. 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.
The test may not be relevant to stress-corrosion cracking in polythionic acid or caustic environments. See Section 7 for specific safety precautions. Deepest cracks found on transverse cross-section of finned tube. However, such correlations may not always be possible.
Stress Corrosion Cracking Testing: ASTM G36, G37, G, & G
Regular examination periods for test specimen cracking were scheduled. 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.
Circumferential cracks with connecting longitudinal crack in base metal of bare tube. Active view current version of standard.
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 is the responsibility of the user of this standard to establish appropriate safety and health practices aatm determine the applicability of regulatory limitations prior to use.
Quality Assurance Return to Corrosion Testing.
Cracking of both test specimens was observed, and the tests were terminated. Etching both sections did not reveal any additional crack depth as sometimes occurs in metallographic studies of stress-corrosion cracking.
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.
This leads to the possibility of confusing stress-corrosion failures with mechanical failures induced by corrosion-reduced net cross sections.
The boiling points of aqueous magnesium chloride solutions at one atmosphere pressure as a function of concentration are shown graphically in Fig.
ASTM G36 – 94(2013)
Asym Version s – view previous versions of standard. Photographs of typical appearance of the cracks on both tubes are shown in Figures 1 and 2.
Careful examination is recommended for correct diagnosis of the cause of failure. 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. Crack characteristics were investigated by preparing metallographic asrm of the test specimens. Accompanying paperwork states that both types of tube were fabricated from the same heat lot of material.
Link to Active This link will always route to the current Active version of the standard.
See Section 7 for specific safety precautions. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Materials that normally provide acceptable resistance in hot chloride service may crack in this test.
Black lines indicate the approximate location of the outer surface of the tube. Newark, Delaware USA 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. 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 Deepest crack found on longitudinal cross-section of bare tube.
The test specimens were immersed in the boiling solution and supported using the suggested ladder-back cradles. 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.
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