The design of pipelines to transmit natural gas from the Mackenzie Delta and the Alaska North Slope to Alberta will place stringent new requirements on material performance. The necessity of transmitting large volumes of gas over long distances provides the impetus to increase operating pressures. In turn, the higher pressures require higher strength steels and/or greater pipe wall thickness. As well, Arctic construction in which the pipeline must traverse areas of continuous or discontinuous permafrost necessitates the use of low operating temperatures and strain-based designs. This presentation will highlight initial development of Grade 550 and Grade 690 line pipe for Arctic applications.