Stainless steel-clad steel plate having exceptional corrosion resistance to seawater

Abstract

A stainless cladding steel plate with excellent sea water corrosion resistance includes a cladding metal including, in mass %, C: not more than 0.030%, Si: 0.02 to 1.50%, Mn: 0.02 to 2.0%, P: not more than 0.040%, S: not more than 0.030%, Ni: 22.0 to 25.0%, Cr: 22.0 to 26.0%, Mo: 3.5 to 5.0% and N: 0.10 to 0.25%, the balance being Fe and inevitable impurities, the cladding metal satisfying relation (1) and being such that amounts of chromium and molybdenum present as precipitates are not more than 0.3 mass % and not more than 0.2 mass %, respectively, Cr+3.3Mo+16N≧40   (1) wherein chemical symbols indicate amounts in mass % of the respective elements.

1 - 3 . (canceled) 
     
     
         4 . A stainless cladding steel plate with excellent sea water corrosion resistance, the stainless cladding steel plate including a cladding metal comprising, in mass %, C: not more than 0.030%, Si: 0.02 to 1.50%, Mn: 0.02 to 2.0%, P: not more than 0.040%, S: not more than 0.030%, Ni: 22.0 to 25.0%, Cr: 22.0 to 26.0%, Mo: 3.5 to 5.0% and N: 0.10 to 0.25%, the balance being Fe and inevitable impurities, the cladding metal satisfying relation (1) and being such that amounts of chromium and molybdenum present as precipitates in the cladding metal are not more than 0.3 mass % and not more than 0.2 mass %, respectively,
   Cr+3.3Mo+16N≧40   (1)
   wherein the chemical symbols indicate the amounts in mass % of the respective elements.   
     
     
         5 . The stainless cladding steel plate according to  claim 4 , wherein the cladding metal further comprises, in mass %, B: 0.0010 to 0.0055%. 
     
     
         6 . The stainless cladding steel plate according to  claim 4 , wherein the cladding metal further comprises, in mass %, Cu: not more than 0.20%. 
     
     
         7 . The stainless cladding steel plate according to  claim 5 , wherein the cladding metal further comprises, in mass %, Cu: not more than 0.20%.