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    采用控軋工藝生產(chǎn)N80 1類鋼級石油套管

    Application of Controlled Rolling in Manufacture of N80 Class 1 Steel Grade Oil Casing

    • 摘要: 介紹了N80 1類鋼級石油套管的生產(chǎn)過程：以Mn-V中碳鋼為基礎，優(yōu)化設計材料成分；采用電爐冶煉+精煉+真空脫氣+連鑄工藝生產(chǎn)連鑄圓管坯；控制環(huán)形爐加熱溫度1 250～1 280℃；控制坯料除鱗高壓水壓力13～20 MPa；采用控軋工藝在奧氏體再結(jié)晶區(qū)及未再結(jié)晶區(qū)“高溫大變形”軋制。檢驗結(jié)果表明：采用控軋工藝生產(chǎn)的N80 1類鋼級套管的屈服強度、抗拉強度、斷后伸長率、沖擊功均符合API Spec 5CT—2011標準對N80 1類鋼級的要求。

       

      Abstract: Introduced in the article is the manufacturing process of N80 class 1 steel grade oil casing concerning the following aspects:optimizing the material composition design basing on Mn-V medium carbon steel;adopting an EF smelting+refining+VD+continuous casting process for CC round billet;controlling the RHF heating temperature to be 1 250-1 280℃;controlling the billet descaling water pressure to be 13-20 MPa;realizing "high temperature big deformation" rolling at the austenitic recrystallization area as well as the non-recrystallization area by adopting a controlled rolling process.The testing results show that the N80 class 1 steel grade oil casing made by the controlled rolling process is in compliance with the requirements of API Spec 5CT-2011 for N80 class 1 steel grade in terms of yield strength, tensile strength, elongation after fracture and impact energy.

       

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