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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Return to Corrosion Testing. Deepest crack found on longitudinal cross-section of bare tube. See Section 7 for specific safety precautions. Link to Active This link will always route to the current Active version of the standard.
ASTM G36 – 94(2013)
Quality Assurance Return to Corrosion Testing. No preparation other than deburring and degreasing was performed on the test specimens prior to testing.
The test specimens were immersed in the boiling solution and supported using the suggested ladder-back cradles. The boiling points of aqueous magnesium chloride solutions at one atmosphere pressure as a function of concentration are asttm graphically in Fig. 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 to chloride stress corrosion cracking.
Etching both sections did not reveal any additional crack depth as sometimes occurs in metallographic studies of stress-corrosion cracking. Careful examination is recommended for correct diagnosis of the cause of failure.
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 y36. 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.
Link to Active This link will always route to the current Active version of the standard. Wstm test specimens were taken off test at 8 hours for examination at low magnification. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Microphotographs of the deepest cracks found on the mounted sections are shown in Figures 3 and 4.
CTL-ASTM G36 – STRESS CORROSION CRACKING in a BOILING MAGNESIUM CHLORIDE SOLUTION
The boiling points of aqueous magnesium chloride solutions at one atmosphere pressure as a function of concentration are shown graphically in Fig. Cracking of both test specimens was observed, and the tests were terminated.
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. Accompanying paperwork states that both types of tube were fabricated from the same heat lot of material.
Materials that normally provide acceptable resistance in hot chloride service may crack in this test. Crack characteristics were investigated by preparing metallographic sections of the test specimens.
Newark, Delaware USA Corrosion Testing Laboratories, Inc. However, such correlations may not always be possible. This leads to the possibility of confusing stress-corrosion failures with mechanical failures induced by corrosion-reduced net cross sections. 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.
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. 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.
Black lines indicate the approximate location of the outer surface of the tube. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. The test may not be relevant to stress-corrosion cracking in polythionic acid or caustic environments.
Active view current version of standard. It is aastm responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Two 2 1-foot long pieces of 0. Historical Version s – view previous versions of standard. Regular examination periods for test specimen cracking were scheduled.
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 astmm.