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    全管體正火熱處理大直徑直縫埋弧焊管的開(kāi)發(fā)

    Development of Full-length Normalization Process for Large-sized SAWL Pipe

    • 摘要: 介紹全管體正火熱處理L290N 直縫埋弧焊管的開(kāi)發(fā)實(shí)踐。對(duì)熱機(jī)械軋制管線鋼鋼板經(jīng)UO 制管后進(jìn)行全管體正火熱處理時(shí)容易出現(xiàn)拉伸屈服強(qiáng)度降低和鋼管變形等問(wèn)題進(jìn)行研究。研究表明：采用C-Mn-微Nb 成分系的L290N 管線鋼，在TMCP 軋制后，獲得鐵素體和珠光體兩相組織，具有明顯的拉伸屈服平臺(tái)，正火熱處理后拉伸屈服強(qiáng)度明顯降低，但依然保持明顯的屈服平臺(tái)，1.0%以內(nèi)的冷變形率進(jìn)行冷整形基本不影響拉伸性能。通過(guò)工程實(shí)踐，批量生產(chǎn)了全管體正火熱處理Φ711 mm×15.88 mm 和Φ914 mm×17.48 mm 規(guī)格L290N 直縫埋弧焊管，其力學(xué)性能和幾何尺寸均滿足GB/T 9711—2017 標(biāo)準(zhǔn)及客戶要求。

       

      Abstract: Described here in the essay are the development activities associated with the full-length normalization process for the large-sized L290N SAWL pipe. Also studied are the problems of commonly-caused weakening of elongation yield strength and tube deformation as staying with the tube that is subjected to the full-length normalization treatment after being UO-formed into a tube from the linepipe-purposed steel plate as mechanically-hot rolled. The study result reveals that after TMCP rolled,the L290N linepipe-purposed steel of the C-Mn-micro Nb composition system develops both the ferrite and the pearlite 2-phase structures,having obvious elongation yield strength platform which still remains after the elongation yield strength is remarkably reduced due to the normalization treatment;and the elongation property is barely effected by the cold-shaping process with the cold deformation rate no more than 1.0%. With relevant engineering practice,the Φ711 mm×15.88 mm and Φ914 mm×17.48 mm full-length normalized L290N SAWL pipes are massively produced with all the indexes concerning the mechanical properties and geometric dimensions up to the GB/T 9711—2017 Standard and relevant customer requirements.

       

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