A　hierarchical　micro-/nanostructure,　consisting　of　nano-sized　Fe2O3　needles　vertically　grown　on　the　{111}　facets　of　micro-octahedral　Fe3O4　particles,　has　been　successfully　prepared　on　the　surface　of　N80　steel　using　hydrothermal　treatment　followed　by　annealing.　The　nanoneedles　were　transformed　from　nanoparticles　on　the　micro-octahedral　facets　under　the　influence　of　mixed　acetone　and　acetic　acid　gas　atmosphere,　and　the　length　of　nanoneedles　can　be　controlled　by　the　annealing　time.　The　superhydrophobic　Fe2O3/Fe3O4　composite　surface　with　water　contact　angle　(WCA)　of　157.3?　and　sliding　angle　(SA)　of　8.1?　was　obtained　after　decorated　with　stearic　acid.　The　influence　of　the　annealing　time　on　the　surface　morphology　and　hydrophobicity　was　explored　and　optimized.　The　superhydrophobic　surface　displays　great　self-cleaning　and　anti-corrosion　performances　with　good　mechanical　robustness.　This　method　opens　a　new　venue　towards　preparing　micro-nanostructures　on　the　surface　of　metallic　materials　for　enhanced　anti-corrosion　and　self-cleaning　applications.