Effect of Cooling Process on the Microstructure and Properties of X80HD2 High Strain Pipeline Steel
NIU Yanlong
Abstract：The influence of cooling temperature, cooling rate and final cooling temperature on the microstructure and properties of X80HD2 pipeline steel were analyzed. The results showed that: in different cold temperatures, the ferrite and bainite dual phase microstructure were obtained. But with decreasing of the cooling temperature, although the ferrite content and the content of M/A increased, the yield strength, Rt0.5/Rm and uniform elongation decreased. With increasing of the cooling rate, the bainite refined, yield strength, Rt0.5/Rm increased, and the uniform elongation decreased. With decreasing of the final cooling temperature, the M/A island refined, tensile strength, Rt0.5/Rm, dσ/dεand uniform elongation increased. The optimum cooling process parameters are:the start cooling temperature is 690℃, the cooling rate is 15℃/s and the final cooling temperature is 400℃.
Keywords：X80HD2 pipeline steelmicrostructuremechanical propertystart cooling temperaturecooling ratefinal cooling temperature
Publication Date：2015-07-02
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：5( 35-38,44 )