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 boiling points of aqueous magnesium chloride solutions at one atmosphere pressure as a function of concentration are shown graphically in Fig. 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. Although this test may be performed using various concentrations of magnesium chloride, this procedure covers a test solution held at a asmt boiling temperature of Crack characteristics were investigated by preparing metallographic sections of the test specimens.
Etching both sections did not reveal any additional crack depth as sometimes occurs in metallographic studies of stress-corrosion cracking.
Test procedures conformed to the referenced ASTM test method. Quality Assurance Return to Corrosion Testing. Cracking of both test specimens was observed, and the tests were terminated. Historical Version s – view previous versions of standard. Circumferential cracks with connecting longitudinal crack in base metal of bare tube.
Accompanying paperwork states that both types of tube were fabricated from the same heat lot of material. Materials ast normally provide acceptable resistance in hot chloride service may crack in this test. Two 2 1-foot long pieces of 0. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. 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 t36 extended in a short arc both longitudinally and circumferentially, the arcs stopping before the next fin was encountered.
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. 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. Photographs of typical appearance of the cracks on both tubes are shown in Figures 1 and 2.
Deepest cracks found on transverse cross-section of finned 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 astn a transverse cross-section.
See Section 7 for specific safety precautions. The boiling points of aqueous magnesium chloride solutions at one atmosphere pressure as a function of concentration are shown graphically in Fig.
However, such correlations may not always be possible. Black lines indicate the approximate location of the outer surface of the tube. A suggested test apparatus capable of maintaining solution concentration and temperature within the prescribed limits for extended periods of time is also described herein. Active view current version g3 standard. Corrosion Testing Laboratories, Inc.
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.
The test specimens were immersed in the boiling v36 and supported using the suggested ladder-back cradles. 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. Microphotographs of the deepest cracks found on the mounted sections are shown xstm Figures 3 and 4.
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.
It is the responsibility of the user of ast standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
See Section 7 for specific safety precautions.
Careful examination is recommended for correct diagnosis of the cause of failure. Although this test may be performed using various concentrations ashm magnesium chloride, this procedure covers a test solution held at a constant boiling temperature of Both test specimens were taken off test at 8 hours for examination at low magnification.
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.
Revised ASTM G36 apparatus
Regular examination periods for test specimen cracking were scheduled. This leads to the h36 of confusing stress-corrosion failures with mechanical failures induced by corrosion-reduced net cross sections.
Return to Corrosion Testing. Newark, Delaware USA Deepest crack found on longitudinal cross-section of bare tube. Referenced Satm purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Link to Active This link will always route to the current Active version of the standard.