X70M鋼級14.10 mm板厚管線鋼制管前后屈服強度變化規(guī)律

Yield Strength Variation Regularity of 14.10 mm Linepipe-purposed X70 Steel Plate before and after Pipe-forming Process

摘要: 分析了X70M鋼級14.10 mm板厚管線鋼制管前后屈服強度變化規(guī)律；利用試驗結果及大生產的性能統(tǒng)計數據，得出通過鋼板屈服強度R_t0.5、拉伸曲線形態(tài)（金相組織類型）兩種預測制管前后屈服強度變化規(guī)律的方法。分析認為：X70M鋼級14.10 mm板厚管線鋼的屈服強度越高，制管后屈服強度下降越多；鋼板屈服強度越低，制管后屈服強度上升越多。

Abstract: Analyzed in the essay is the yield strength variation regularity of the14.10 mm X70 steel plate before and after the pipe-forming process.Based on the analysis, and the test result and the statistic data of the properties as obtained from the massive production two methods respectively using the yield strength as R_t0.5of the steel plate, and the tensile curve morphology(i.e., the metallographic structure type)of the steel plate are established to predict the yield variation regularity of the steel plate before and after the pipe-forming process.The analysis leads to such as conclusion that the higher the 14.10 mm linepipe-purposed X70M steel plate is, the lower this value will be after the pipe-forming process, and vice versa.