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    兩種組織類型的X70鋼級(jí)管線鋼的帶狀組織淺析（上）

    Banded Structure Analysis of X70 Grade Steel with Dual Structures for Line Pipe（Part I）

    • 摘要: 根據(jù)抽檢試驗(yàn)和工廠首批出證試驗(yàn)的結(jié)果,探討和分析了鐵素體+少珠光體型及針狀鐵素體型X70鋼級(jí)管線鋼帶狀組織的特點(diǎn),帶狀組織形成與控軋及控冷工藝和鋼的化學(xué)成分尤其是Mo的含量的關(guān)系,以及帶狀組織程度對(duì)鋼管母材夏比沖擊韌性、DWTT試驗(yàn)SA值、抗HIC性能的影響。

       

      Abstract: Based on the results of the random test and the test with a first-lot factory certificate,discussed and analyzed are the banded structure features of X70 grade steel with the ferrite plus deficient pearlite and the acicular ferrite for the line pipe,the relations between the formation of the banded structure and the controlled rolling,the cold control process and the steel chemical composition,especially the Mo content,and also the influence of the banded structure extent on the base material Sharp impact toughness,the DWTT test SA values and the HIC resistance property of steel pipes.

       

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