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【關鍵詞】 石油鉆桿; 大型夾雜物; 裂紋; 分析; 措施; 【英文關鍵詞】 Oil drill pipe; Large inclusion; Cracking; Analysis; Actions; 【摘要】 通過管體無損探傷檢驗和人工表面檢驗,并利用掃描電鏡和能譜儀對石油鉆桿缺陷試樣進行微觀檢驗,結果表明連鑄坯大型夾雜物是導致鉆桿裂紋的主要因素。根據鋼管塑性變形理論分析了裂紋形成過程,提出了減少裂紋的措施。 【英文摘要】 The key element responsible for the cracking of the oil drill pipe is the large inclusion in the continuously cast billet. This conclusion is supported by the results of NDT detection and visual inspection of the pipe body and microstructure tests with the defective sample taken from the pipe by scanning electron microscope and energy spectrometer. The crack development process is also analyzed with the steel tube plastic deformation theory, and corrective actions are accordingly put forward.