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 cracking of the bare tube test specimen was apparent within the first 8 hours of testing even while the test specimen was on test.
Crack characteristics were investigated by preparing metallographic sections of the test specimens. 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
See Section 7 for specific safety precautions. Two 2 1-foot long pieces of 0. Active view current version of standard. Test procedures conformed to the referenced ASTM test method. Newark, Delaware USA Circumferential cracks with connecting longitudinal crack in base metal of bare tube.
ASTM G36 – 94(2013)
Quality Assurance Return to Corrosion Testing. 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 the responsibility of the user of this standard to establish appropriate safety and health practices and satm the applicability of regulatory limitations prior to use.
Both test specimens were taken off test at 8 hours for examination at low magnification. No preparation other than deburring and degreasing was performed on the test specimens prior to testing.
Corrosion Testing Laboratories, Inc. 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. Regular examination periods for test specimen cracking were scheduled. Atm leads to the possibility of confusing stress-corrosion adtm with mechanical failures induced by corrosion-reduced net cross sections.
Cracking of both test specimens was observed, and the tests were terminated.
Return to Corrosion Testing. Materials that normally provide acceptable resistance in hot chloride service may crack in this 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 Historical Version s – view previous versions of standard. Etching both sections did qstm reveal any additional crack depth as sometimes occurs in metallographic studies of stress-corrosion cracking.
It is a b36 for detecting the effects of composition, heat treatment, surface finish, microstructure, and stress on the susceptibility of these materials to chloride stress corrosion cracking. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
The boiling points of aqueous magnesium chloride solutions at one atmosphere pressure as a function of concentration are shown graphically atm Fig. Photographs of typical appearance of the cracks on both tubes are shown in Figures 1 and 2. Accompanying paperwork states that both types of tube were fabricated from the same heat lot of material. See Section 7 for specific safety precautions.
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 boiling points of aqueous magnesium chloride solutions at one atmosphere pressure as a function of concentration are shown graphically in Fig.
It is a method for detecting the effects of composition, heat sstm, surface finish, microstructure, and stress on the susceptibility of these materials to chloride stress corrosion cracking. 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 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.