X90鋼級管線鋼制管前后性能變化研究

Study on Property Changes of X90 Linepipe-purposed Steel before and after Being Manufactured into Pipes

摘要: 介紹了X90鋼級管線鋼制管前后屈服強度、抗拉強度、屈強比、沖擊韌性的變化，分析了產(chǎn)生這些變化的原因，并給出X90鋼級卷板的性能控制值。試驗結(jié)果表明：制管后X90鋼級管線鋼的屈服強度和抗拉強度均上升，且抗拉強度平均升幅大于屈服強度；沖擊韌性下降。在制管過程中，因卷板受形變強化的影響，造成制管后屈服強度和抗拉強度升高而韌性下降；而形變強化對制管前后強韌性的影響由卷板的化學(xué)成分及軋制工藝決定。

Abstract: Described in the article are the changes of yield strength，tensile strength，yield ratio and impact toughness of the X90 linepipe-purposed steel before and after being turned into the pipe. Analyzed are the reasons for these changes. Accordingly，control values of the above mentioned properties of the X90 steel plate are determined.Related test results show that after the said steel plate being processed into the pipe，both the yield strength and the tensile strength go up，and the average gain of the tensile strength is greater than that of the yield strength，whereas the impact toughness goes down. The reason for such property changes is the influence on the steel plate by the working hardening，and the influence itself depends on the chemical composition and the rolling process as used for the steel plate.