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PRCI PR-185-620
- Field Weldability of High Strength Pipeline Steels
- Report / Survey by Pipeline Research Council International, 03/04/1988
- Publisher: PRCI
$225.00$449.00
L51579e
Edison Welding Institute
Need: There are a number of economic advantages that arise through using high strength pipeline steels. The reduced wall thickness leads to lower steel tonnage requirements and provides scope for reducing welding time. Until relatively recently, the API specification 5L "API Specification for Linepipe" only covered steels up to 70 ksi minimum yield strength, denoted X70. The most recent edition of API 5L also includes X80 grade material. There is little information available, however, on the welded properties of X80 grade steel and, therefore, The Welding Supervisory Committee of PRCI initiated a project to study the welding aspects of this grade.
Benefit: This document reports on small scale weldability tests on two X80 grade steels and presents mechanical property data on full-size circumferential girth welds. Small scale SMA weldability was assessed using the WIC test with cellulosic consumables of matching strength. Weld metal, rather than HAZ, hydrogen cracking was found to occur at preheat temperatures below approximately 110 C (230 F). Heat affected zone cracking was not observed in any of the WIC tests.
Result: This project has studied the small scale SMA weldability of two X80 grade pipeline steels and conducted a number of mechanical and fracture toughness tests on full-size SMA and GMA welds in both pipes.
Edison Welding Institute
Need: There are a number of economic advantages that arise through using high strength pipeline steels. The reduced wall thickness leads to lower steel tonnage requirements and provides scope for reducing welding time. Until relatively recently, the API specification 5L "API Specification for Linepipe" only covered steels up to 70 ksi minimum yield strength, denoted X70. The most recent edition of API 5L also includes X80 grade material. There is little information available, however, on the welded properties of X80 grade steel and, therefore, The Welding Supervisory Committee of PRCI initiated a project to study the welding aspects of this grade.
Benefit: This document reports on small scale weldability tests on two X80 grade steels and presents mechanical property data on full-size circumferential girth welds. Small scale SMA weldability was assessed using the WIC test with cellulosic consumables of matching strength. Weld metal, rather than HAZ, hydrogen cracking was found to occur at preheat temperatures below approximately 110 C (230 F). Heat affected zone cracking was not observed in any of the WIC tests.
Result: This project has studied the small scale SMA weldability of two X80 grade pipeline steels and conducted a number of mechanical and fracture toughness tests on full-size SMA and GMA welds in both pipes.
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