钢的密度d=7.85g/cm3
v1=π*(83/2)*(83/2)*1180=6384517.3782211252578318993288867cm3
v2=π*[(83-2*12)/2)]*[(83-2*12)/2)]*1180=3226085.7880080907276110961770728cm3
V=v1-v2=3158431.5902130345302208031518139cm3
W=dv=24793687.983172321062233304741739g=24793.687kg=24.793687T