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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Circumferential cracks with connecting longitudinal crack in base metal of bare tube. Test procedures conformed to the referenced ASTM test method. See Section 7 for specific safety precautions.
Both test specimens were taken off test at 8 hours for examination at low magnification. Link to Active This link will always route to the current Active version of the standard.
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. Return to F36 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. Two 2 1-foot long pieces of 0. Etching both astj did not reveal any additional crack depth as sometimes occurs in metallographic studies of stress-corrosion cracking.
A suggested test apparatus capable of maintaining solution concentration and temperature within the prescribed limits for extended periods of time is also described herein. 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. 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 specimens were immersed in the boiling solution and supported using the suggested ladder-back cradles.
Revised ASTM G36 apparatus
Photographs of typical appearance of the cracks on both tubes are shown in Figures 1 and 2. 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. Materials that normally provide acceptable resistance in hot chloride service may crack in this test.
Regular examination periods for test specimen cracking were scheduled. Active view current version of 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.
Corrosion Testing Laboratories, Inc. See Section 7 for specific safety precautions.
ASTM G36 – 94(2013)
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Circumferential cracking of the bare tube test specimen was apparent within aztm first 8 hours of testing even while the test specimen was on test. 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 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.
Deepest crack found on longitudinal cross-section of bare tube. Careful examination is recommended for correct diagnosis of the cause of aastm.
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.
Microphotographs of the deepest cracks found on the mounted sections are shown in Figures 3 and 4. 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.
The boiling points of aqueous magnesium chloride solutions at one atmosphere pressure as a function of concentration are shown graphically in Fig. This leads to the possibility of confusing stress-corrosion failures with mechanical failures induced by corrosion-reduced net cross sections. Cracking of both test specimens was observed, and wstm tests were terminated.