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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 astj points of aqueous magnesium chloride solutions at one atmosphere pressure as a function of concentration are shown graphically in Fig. Newark, Delaware USA The boiling points of aqueous magnesium chloride solutions at one atmosphere pressure as a function of concentration are shown graphically in Fig.
Deepest cracks found on transverse cross-section of finned tube.
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. Although this test may be performed using various astmm of magnesium chloride, this procedure covers a test solution held at a constant boiling temperature of 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, t36 arcs stopping before the next fin was encountered.
Black lines indicate the approximate location of the outer surface of the tube.
Revised ASTM G36 apparatus
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 However, such correlations may not always be possible. Both test specimens were taken off test g6 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.
No preparation other than deburring and degreasing was performed on the test specimens prior to testing. The test may not be relevant to stress-corrosion cracking in polythionic acid or caustic environments.
G2MT Laboratories
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Historical Version s – view previous versions of standard. 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.
Cracking of both test specimens was observed, and the tests were terminated. Microphotographs of the deepest cracks found on the mounted sections are shown in Figures 3 and 4.
Stress Corrosion Cracking Testing: ASTM G36, G37, G, & G
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.
The test specimens were immersed in the boiling solution and supported using the suggested ladder-back cradles. This leads to the possibility of confusing stress-corrosion failures with mechanical failures induced by corrosion-reduced net cross sections.
Deepest crack found on longitudinal cross-section of bare tube.
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.
Careful examination is recommended for correct diagnosis of the cause of failure.
ASTM G36 – 94(2013)
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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. Return to Corrosion Testing. Accompanying paperwork states that both types of tube were fabricated from the same heat lot of material.
Active view current version of standard. Circumferential cracks with connecting longitudinal crack in base metal of bare tube. Astj both sections did not reveal any additional crack depth as sometimes occurs in metallographic studies of stress-corrosion cracking. Crack g3 were investigated by preparing metallographic sections of the test specimens. Test procedures conformed to the referenced ASTM test method.
Quality Assurance Return to Corrosion Testing. Regular examination periods for test specimen cracking were scheduled. Two 2 1-foot long asmt of 0.
See Section 7 for specific safety precautions. Materials that normally provide acceptable resistance in hot chloride service may crack in this test. Link to Active This link will b36 route to the current Active version of the standard. 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.
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 will always route to the current Active version of the standard. See Astn 7 for specific safety precautions.
Corrosion Testing Laboratories, Inc. Photographs of typical appearance of the cracks on both tubes are shown in Figures 1 and 2. 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.