OCTG: Brittle failures of OCTG components due to improper testing after manufacturing ///
Brittle cracking of oilfield tubular components can occur, due to poor fracture toughness of the material. For heat-treated material, most vendor and user manufacturing specifications, including those from the American Petroleum Institute (API), require the mechanical test specimen to be removed from either a sacrificial production part, a prolongation removed from a production part, or a QTC from the same heat. In certain cases, manufacturers prefer to perform all mechanical testing on a QTC. Improper testing methods used after manufacturing, including improper QTC testing, may lead to catastrophic, brittle failures.
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