 Its usual commercial form is a powder , but this element can be consolidated by pressing and sintering in a vacuum or hydrogen atmosphere . This procedure yields a compact solid having a density above 90 % of the density of the metal . When annealed this metal is very ductile and can be bent , coiled , or rolled . Rhenium @-@ molybdenum alloys are superconductive at 10 K ; tungsten @-@ rhenium alloys are also superconductive around 4 – 8 K , depending on the alloy . Rhenium metal <unk> at 1 @.@ 697 ± 0 @.@ 006 K. 
