Alloy 400 ikoreshwa cyane mubice byinshi, cyane cyane gutunganya inyanja n’imiti. Porogaramu isanzwe ni valve na pompe; pompe na moteri; ibikoresho byo mu nyanja n'ibifunga; ibikoresho by'amashanyarazi na elegitoroniki; amasoko; ibikoresho byo gutunganya imiti; lisansi n'ibigega by'amazi meza; peteroli ya peteroli iracecetse, gutunganya ibikoresho no kuvoma; amashyanyarazi ashyushya amazi nandi ahinduranya ubushyuhe; nubushyuhe.