Relationship Between Microstructure and Mechanical Properties of X100 Pipeline Steel
The relationship between microstructure and mechanical properties of X100 pipeline steel was investigated.The results show that the microstructure of X100 pipeline steel consists of acicular ferrite,granular bainite and M/A island.Due to the difference of chemical composition,rolling craft,microstructure proportion and microstructure morphology,the mechanical properties including tensile and impact properties are different,but the hardness and fracture-arrest toughness have not obvious influence.As long as strictly controlling S and P content in the steel,using reasonable craft to guarantee that fine texture crystal grain uniformly distributes and avoids the big area M/A island shaped sheet,it is advantageous to enhance the tensile and impact properties of the pipeline steel,which obtains good high strength rank pipeline steel.