| 摘要 |
PROBLEM TO BE SOLVED: To provide a water storage tank excellent in corrosion resistance by using ferrite stainless steel as a reinforcing material of the water storage tank having a metal reinforcing material to the inside thereof. SOLUTION: A reinforcing material contains C: 0.02% and less in wt.%, Si: 0.6% and less, Mn: 0.4% and less, P: 0.04% and less, S: 0.003% and less, Cr: 20-26%, Mo: 0.8-2.5%, N: 0.02% and less, Ti: 0.05-0.4% and/or Nb: 0.1-0.6%, and a water storage tank excellent in corrosion resistance is constituted of steel having composition satisfying relations of C±N<=0.35%, Ti±Nb>=7×(C+ N)+0.15%. The steel can also contain Cu: 0.3-0.8% and/or Al: 0.1-0.3%. In order to fix the reinforcing material with bolts, it is favorable to clamp it through synthetic rubber or a synthetic resin gasket.
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