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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See Section 7 for specific safety precautions. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory xstm prior to use.
Materials that normally provide acceptable resistance in hot chloride service may crack in this test.
Two 2 1-foot long pieces of 0. Black lines indicate the approximate location of the outer ast of the tube. The test may not be relevant to stress-corrosion cracking in polythionic acid or caustic environments.
CTL-ASTM G36 – STRESS CORROSION CRACKING in a BOILING MAGNESIUM CHLORIDE SOLUTION
Historical Version s – view previous versions of standard. Microphotographs of the deepest cracks found on the mounted sections are shown in Figures 3 and 4. See Section 7 for specific safety precautions.
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. Careful examination is recommended for correct diagnosis of the cause of failure. 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. The boiling points of aqueous magnesium chloride solutions at one atmosphere pressure as a function of concentration are shown graphically in Fig.
Crack characteristics were investigated by preparing metallographic sections of the test specimens. Deepest crack found on longitudinal cross-section of bare tube. This leads to the possibility of confusing stress-corrosion failures with mechanical failures induced by corrosion-reduced net cross sections. 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.
Active view current version of standard. However, such correlations may not always be possible. Accompanying paperwork states that both types of tube were ashm from the same heat lot of material.
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 Test procedures conformed to the referenced ASTM test method.
Return to Corrosion Testing. Link to Active This link will always route to the current Active version of the 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.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Newark, Delaware USA 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.
On the finned test specimen, cracks extended down the fins from the outer asstm 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, astn arcs stopping before the next fin was encountered. Etching both sections did not reveal any additional crack depth as sometimes occurs in 3g6 studies of stress-corrosion cracking. Quality Assurance Return to Corrosion Testing.
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. 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.
Cracking ashm both test specimens was observed, and the tests were terminated. 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. Circumferential cracks with connecting longitudinal crack in base metal of bare tube.