Metallurgical Optimization of Microalloyed Steels for Oil and Gas Transmission Pipelines  

作　　者：Stalheim Douglas 

机构地区：[1]DGS Metallurgical Solutions Inc.,15003 NE 10th Street,Vancouver,WA98684 USA

出　　处：《Journal of Iron and Steel Research International》2011年第S1期669-674,共6页

摘　　要：The production of microalloyed steels for oil and gas transmission pipelines has increased significantly over the past years.With more and more countries developing their own capabilities to produce pipeline steels to support their own internal pipeline infrastructure development,there has been an increase of steel producers working to develop their own capabilities to produce microalloyed steels for this application.However,to achieve the desired mechanical property attributes for transmission pipeline applications utilizing a cost effective approach requires metallurgical optimization of the microalloyed steels.To achieve metallurgical optimization a basic understanding is required in the design of a cost effective alloy and then the proper processing of that alloy design to achieve the optimum microstructure/mechanical properties.In this sense,many producers in the world,especially those who have only recently,in the past 10 years,developed their capability to produce microalloyed transmission pipeline steels still do not achieve metallurgical optimization of their alloy and process.This results in yield losses due to failures,inefficient processing causing productivity losses and additional expensive additions of alloys to compensate for failures and process inefficiencies.Since the supplier of plate/coil has the largest percentage effect on the final cost of the pipe,the steel producer must understand proper alloy,microstructure,and process design to produce a uniform and stable plate/coil to be used in pipe production.This means that strength,toughness and microstructure must be uniform down the length,across the width and through the cross section.Metallurgical optimization is achieved when this uniformity is achieved with a cost effective approach.Counter to that,non-uniformity results in pipe forming,welding,expansion,mechanical property and production issues resulting in downgraded pipe and cost overruns in pipemaking.This paper will describe targets for plate/coil uniformity for pipe production and shoThe production of microalloyed steels for oil and gas transmission pipelines has increased significantly over the past years.With more and more countries developing their own capabilities to produce pipeline steels to support their own internal pipeline infrastructure development,there has been an increase of steel producers working to develop their own capabilities to produce microalloyed steels for this application.However,to achieve the desired mechanical property attributes for transmission pipeline applications utilizing a cost effective approach requires metallurgical optimization of the microalloyed steels.To achieve metallurgical optimization a basic understanding is required in the design of a cost effective alloy and then the proper processing of that alloy design to achieve the optimum microstructure/mechanical properties.In this sense,many producers in the world,especially those who have only recently,in the past 10 years,developed their capability to produce microalloyed transmission pipeline steels still do not achieve metallurgical optimization of their alloy and process.This results in yield losses due to failures,inefficient processing causing productivity losses and additional expensive additions of alloys to compensate for failures and process inefficiencies.Since the supplier of plate/coil has the largest percentage effect on the final cost of the pipe,the steel producer must understand proper alloy,microstructure,and process design to produce a uniform and stable plate/coil to be used in pipe production.This means that strength,toughness and microstructure must be uniform down the length,across the width and through the cross section.Metallurgical optimization is achieved when this uniformity is achieved with a cost effective approach.Counter to that,non-uniformity results in pipe forming,welding,expansion,mechanical property and production issues resulting in downgraded pipe and cost overruns in pipemaking.This paper will describe targets for plate/coil uniformity for pipe production and sho

关 键 词：MICROALLOY NIOBIUM PIPELINE SOLUBILITY grain size rolling schedule 

分 类 号：TF763[冶金工程—钢铁冶金]