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    調(diào)質(zhì)石油套管管坯的外徑控制和生產(chǎn)工藝的探討

    DISCUSSION ON O. D. CONTROL AND MANUFACTURING PROCESS OF QUENCHED／TEMPERED BLANK PIPES FOR OIL CASINGS

    • 摘要: 介紹了成都無(wú)縫鋼管有限責(zé)任公司原生產(chǎn)調(diào)質(zhì)石油套管管坯的定徑工藝簡(jiǎn)況。通過(guò)對(duì)N80級(jí)石油套管管坯調(diào)質(zhì)前后外徑的多次測(cè)試,了解到其外徑脹大的趨勢(shì),提出了相應(yīng)的外徑控制精度。探討了石油套管管坯調(diào)質(zhì)后熱定徑的工藝情況。結(jié)果表明,管坯調(diào)質(zhì)后不經(jīng)熱定徑,可生產(chǎn)出符合API5CT要求的N80級(jí)及以上鋼級(jí)的一般高強(qiáng)石油套管;但是,為了獲得高精度外徑的石油套管,并進(jìn)一步擴(kuò)大品種,調(diào)質(zhì)后再經(jīng)熱定徑也是必要的。

       

      Abstract: The paper first briefly introduces the sizing process for quenched/tempered blank tubes for oil casings originally used in the facility of Chengdu Seamless Steel Tube Co.,Ltd. Based on the O.D.expansion rule learned via repeatedly measuring of O.D.of N80 casing blank tubes before and after quenching/tempering,proper tolerance of O.D. control has been set up.Also discussed are the two processes for the tubes,i.e. post-quenching/tempering hot-sizing process and non-post-quenching/tempering hot sizing process.The operational results show that without post-quenching/tempering hot-sizing treatment,it is allowable for producing ordinary hi-strength oil casing pipes of N80 and higher grades up to API Spec.5CT. However,to produce oil casing pipes with high O.D.accuracy and to expand the product-mix,it is still a necessity to get the pipes undergo hot-sizing after quenching/tempering.

       

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