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.
|Published (Last):||15 February 2011|
|PDF File Size:||19.33 Mb|
|ePub File Size:||12.77 Mb|
|Price:||Free* [*Free Regsitration Required]|
CTL-ASTM G36 – STRESS CORROSION CRACKING in a BOILING MAGNESIUM CHLORIDE SOLUTION
The boiling points of aqueous magnesium chloride solutions at one gg36 pressure as astn function of concentration are shown graphically in Fig. Deepest crack found on longitudinal cross-section of bare tube. 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. 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.
Circumferential cracks with connecting longitudinal crack in base metal of bare tube.
Two 2 1-foot long pieces of 0. 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. 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. Link to Active This link will always route to the current Active version of the standard.
Both test specimens were taken off test at 8 hours for examination at low magnification.
However, such correlations may not always be xstm. Accompanying paperwork states that both types of tube were fabricated from the same heat lot of material.
Revised ASTM G36 apparatus
Materials that normally provide acceptable resistance in hot chloride service may crack in this test. Corrosion Testing Laboratories, Inc.
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. Deepest cracks found on transverse cross-section of finned tube.
This leads to the possibility of ashm stress-corrosion failures with mechanical failures induced by corrosion-reduced net cross sections.
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. Newark, Delaware USA 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 Etching both sections did not reveal any additional crack depth as sometimes occurs in metallographic studies of stress-corrosion cracking.
Microphotographs of the deepest cracks found on the mounted sections are shown in Figures 3 and 4. Crack characteristics were investigated by preparing metallographic sections of the test specimens. It ashm decided that cracks in the bare tube could be best examined using a longitudinal cross-section, while v36 cracks in the finned tube could be best examined using a transverse cross-section.
The weld and HAZ of the finned tube appeared to have more cracks than the base asym, and the cracks appear to nearly connect from fin to fin.
The test specimens were immersed in the boiling solution and supported using the suggested ladder-back cradles. Test procedures conformed to the referenced ASTM test method. 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 of standard. Regular examination periods for test specimen cracking were scheduled. No preparation other than deburring and degreasing was performed on the test specimens prior to testing.
Cracking of both test specimens was observed, and the tests were terminated. See Section 7 for specific safety precautions.
Return to Corrosion Testing. Although this test may be performed asfm various concentrations of magnesium chloride, this procedure covers a test solution held at a constant boiling temperature of The test may not be relevant to stress-corrosion cracking in polythionic acid or caustic environments.
Quality Assurance Return to Corrosion Testing. Careful examination is recommended for correct diagnosis of the cause of failure. Black lines indicate the approximate location of the outer surface of the tube. This danger is atm great when small cross section samples, high applied stress levels, long exposure periods, stress-corrosion resistant alloys, or a combination thereof are being used. Historical Version s – view previous versions of standard. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part 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. Photographs of typical appearance of the cracks on both tubes are shown in Figures 1 and 2.