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PRCI Report 178
- Evaluation of an X80 Pipe Fabricated from a Plate Processed using On-line Accelerated Cooling
- Report / Survey by Pipeline Research Council International, 01/08/1988
- Publisher: PRCI
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NR198803e
Battelle Memorial Institute
Need: In recent years a number of important developments in steel making, rolling, and heat treatment have been applied to the production of plate for API Grades X65 through X80 line pipe. Based on industry interest in the performance of these steels in line pipe, a research task was to investigate the characteristics of representative examples of these new pipes. The objectives of this task are to provide independent measurements of pipe properties and to examine the metallurgical characteristics that may affect their performance in service. It is anticipated that information from the task will aid users in the selection of pipe for future gas-transmission lines.
Result: This report presents the results of an evaluation of an X80 pipe fabricated from a microalloyed, controlled-rolled steel processed using on-line accelerated cooling.
Benefit: The sensitivity of the pipe steel to changes in properties as a result of thermal treatments of the type that might be encountered during application of a fusion-bonded thin film coating, or post-weld stress relief, should be considered when judging the suitability of this pipe for a specific service application. The pipe steel was highly sensitive to hydrogen-induced stepwise cracking as defined by the standard NACE sour environment test procedure. It was not found to be sensitive to either localized sulfide-stress cracking at the double submerged arc seem weld, or to hydrogen stress cracking in tests that simulated the conditions encountered in a mechanically-damaged pipe region under cathodic protection in service.
Battelle Memorial Institute
Need: In recent years a number of important developments in steel making, rolling, and heat treatment have been applied to the production of plate for API Grades X65 through X80 line pipe. Based on industry interest in the performance of these steels in line pipe, a research task was to investigate the characteristics of representative examples of these new pipes. The objectives of this task are to provide independent measurements of pipe properties and to examine the metallurgical characteristics that may affect their performance in service. It is anticipated that information from the task will aid users in the selection of pipe for future gas-transmission lines.
Result: This report presents the results of an evaluation of an X80 pipe fabricated from a microalloyed, controlled-rolled steel processed using on-line accelerated cooling.
Benefit: The sensitivity of the pipe steel to changes in properties as a result of thermal treatments of the type that might be encountered during application of a fusion-bonded thin film coating, or post-weld stress relief, should be considered when judging the suitability of this pipe for a specific service application. The pipe steel was highly sensitive to hydrogen-induced stepwise cracking as defined by the standard NACE sour environment test procedure. It was not found to be sensitive to either localized sulfide-stress cracking at the double submerged arc seem weld, or to hydrogen stress cracking in tests that simulated the conditions encountered in a mechanically-damaged pipe region under cathodic protection in service.
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