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PRCI PR-238-9502
- Non-Destructive Assurance of Quality of Heat Treated Fittings
- Report / Survey by Pipeline Research Council International, 03/21/1997
- Publisher: PRCI
$98.00$195.00
L51758e
The Netherlands Organization for Applied Scientific Research (TNO)
Need: Sometimes heat treated components fail to pass the specified minimum mechanical requirements (yield strength, Charpy V-notch toughness). The influence of the complete heat cycle on the end results is not well understood and without a N.D.T. method for determining these properties the pipeline companies have difficulty in determining acceptable and non-acceptable individual components. In the quality control process for heat treated components, it is important to have a non-destructive testing technique available for predicting the yield strength and, if necessary, Charpy V-notch properties.
Result: In order to quantify the influence of the thermal cycle on the essential mechanical properties of plate material FeE355 and evaluate a promising N.D.T method for predicting yield strength and toughness, five heats of plate material FeE355 received ten different normalizing heat treatments (combinations of three different austenitizing temperatures and 4 heating/cooling rates). The heat treatment conditions were chosen to obtain a wide range of ferrite grain sizes/yield strengths. Together with the as-delivered conditions 55 conditions of plate material FeE355 were examined. The
examination included:
- Ferrite grain size measurements directly on the outer surface of the material (after removal of the decarburized zone) by means of replicas.
- Tensile tests at 20°C, in twofold for all 55 conditions.
- Charpy V impact tests at three temperatures, each in threefold for all 55 conditions.
- Ferrite grain size measurements on cross sections of one of the threaded ends of all 110 tensile specimens.
Benefit: With the above given background, the PRCI project N.D.-ASSURANCE OF QUALITY OF HEAT TREATED FITTINGS has been executed. Relevant results of the above mentioned project are included and communicated together with the results attained in the PRCI project of which this is the final report.
The Netherlands Organization for Applied Scientific Research (TNO)
Need: Sometimes heat treated components fail to pass the specified minimum mechanical requirements (yield strength, Charpy V-notch toughness). The influence of the complete heat cycle on the end results is not well understood and without a N.D.T. method for determining these properties the pipeline companies have difficulty in determining acceptable and non-acceptable individual components. In the quality control process for heat treated components, it is important to have a non-destructive testing technique available for predicting the yield strength and, if necessary, Charpy V-notch properties.
Result: In order to quantify the influence of the thermal cycle on the essential mechanical properties of plate material FeE355 and evaluate a promising N.D.T method for predicting yield strength and toughness, five heats of plate material FeE355 received ten different normalizing heat treatments (combinations of three different austenitizing temperatures and 4 heating/cooling rates). The heat treatment conditions were chosen to obtain a wide range of ferrite grain sizes/yield strengths. Together with the as-delivered conditions 55 conditions of plate material FeE355 were examined. The
examination included:
- Ferrite grain size measurements directly on the outer surface of the material (after removal of the decarburized zone) by means of replicas.
- Tensile tests at 20°C, in twofold for all 55 conditions.
- Charpy V impact tests at three temperatures, each in threefold for all 55 conditions.
- Ferrite grain size measurements on cross sections of one of the threaded ends of all 110 tensile specimens.
Benefit: With the above given background, the PRCI project N.D.-ASSURANCE OF QUALITY OF HEAT TREATED FITTINGS has been executed. Relevant results of the above mentioned project are included and communicated together with the results attained in the PRCI project of which this is the final report.
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