Title: Effect of Controlled Cooling on Microstructure Refinement and Mechanical Properties of Pipeline Steel X65
Abstract:The process of the controlled cooling after rolling was laboratorially studied on a 450 rolling mill with the low-carbon low-alloy pipeline steel X65 as specimens to provide further an experimental a...The process of the controlled cooling after rolling was laboratorially studied on a 450 rolling mill with the low-carbon low-alloy pipeline steel X65 as specimens to provide further an experimental and theoretical reference for actual industrial production.TEM images showed that the typical morphology of acicular ferrite is a very fine sub-structure with high dislocation density and part of ultra-fine ferrite,of which the small M/A islands and cementite are dispersing on the matrix.Experimental results showed that not only the microstructure is refined obviously but also the volume fraction of acicular ferrite increases and the mechanical properties are improved with decreasing coiling temperature or increasing cooling rate.The flexible rolling is thus available to the X65 ferrite-pearlite steel through controlled cooling after rolling,by which both its microstructure and mechanical properties can be improved so significantly even superior to the performance requirements for the Grade X70 pipeline steel.Read More
Publication Year: 2007
Publication Date: 2007-01-01
Language: en
Type: article
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Cited By Count: 1
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