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    HFW高頻焊接管線管屈強比的控制與探討

    Control of HFW Linepipe Yield Strength Ratio and Related Discussion

    • 摘要: 介紹了管線鋼的強化機理，分析了HFW 管線管在不同拉伸試驗方法下的試驗結果，并對比縱向試樣與橫向試樣的屈強比。分析認為：與脹環(huán)法拉伸試樣相比，檢測HFW 管線管拉伸性能時采用板狀拉伸試樣，測得的屈服強度、屈強比數(shù)值相對較離散，這與加工板狀拉伸試樣時的硬化效應有關，但不會對材料的抗變形能力產(chǎn)生顯著影響；隨著HFW 管線管強度的提高，其屈強比會小幅上升；管線管的縱向屈強比高于橫向屈強比，其差值隨管線管厚徑比的增加而增大。

       

      Abstract: The strengthening mechanism of the linepipe steel is briefed. The results of the tensile tests as made to the HFW linepipe with different methods are analyzed,and the yield strength ratio of the longitudinal specimen is compared with that of the transversal specimen. It is regarded via the analysis that compared with the specimen for the expanding-ring test,the plate specimen is employed for testing the tensile property of the HFW linepipe,resulting in relatively scattered yield strength and yield strength ratio data,which is related to the hardening effect as produced when processing the plate specimen,but only so slightly affects the deformation-resistance of the material. Along with the increase of the HFW linepipe’s strength,the yield strength ratio is a little bit increased. The pipe’s longitudinal yield strength ratio is higher than the transversal yield strength ratio,and the difference between the two is increased along with the increase of the D/S ratio of the linepipe.

       

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