Abstract: Disclosed is a manufacturing method for a seawater-resistant stainless clad steel including a cladding material made of stainless steel having a pitting index represented by Cr[mas %]+3.3Mo[mass %]+16N[mass %], of 35.0 or more and a microstructure in a surface portion thereof including, by area ratio, less than 2.0% of a ? phase. The method including the steps of performing a mechanical treatment from at least one of grindstone polishing and belt polishing and performing at least one of an electrolytic treatment in acid solutions or in neutral salt solutions, and a pickling treatment, to manufacture the stainless clad steel having dynamic friction coefficients in the rolling direction and in a direction at a right angle to the rolling direction, determined in accordance with JIS K 7125, both of 0.05 or less.

Abstract: A cladding material for stainless steel clad steel plate, includes, by mass %, 0.03% or less carbon, 1.5% or less silicon, 2.0% or less manganese, 0.04% or less phosphorus, 0.03% or less sulfur, 22.0% to 25.0% nickel, 21.0% to 25.0% chromium, 2.0% to 5.0% molybdenum, 0.15% to 0.25% nitrogen, and the balance being iron and incidental impurities, wherein critical pitting temperature (CPT) after normalization as determined in accordance with ASTM G48-03 Method E is 45° C. or higher, and corrosion loss at a welded zone as determined by a corrosion test in accordance with NORSOK Standard M-601 is 1.0 g/m2 or less.

Abstract: Disclosed is a manufacturing method for a seawater-resistant stainless clad steel including a cladding material made of stainless steel having a pitting index represented by Cr[mas %]+3.3Mo[mass %]+16N[mass %], of 35.0 or more and a microstructure in a surface portion thereof including, by area ratio, less than 2.0% of a ? phase. The method including the steps of performing a mechanical treatment from at least one of grindstone polishing and belt polishing and performing at least one of an electrolytic treatment in acid solutions or in neutral salt solutions, and a pickling treatment, to manufacture the stainless clad steel having dynamic friction coefficients in the rolling direction and in a direction at a right angle to the rolling direction, determined in accordance with JIS K 7125, both of 0.05 or less.

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.

Abstract: A base metal for a high-toughness clad plate has a shear area of 85% or more in a ?20° C. DWTT test and includes, in terms of % by mass, C: 0.030% to 0.10%, Si: 0.10% to 0.30%, Mn: 1.30% to 1.80%, P: 0.015% or less, S: 0.003% or less, Mo: 0.05% to 0.50%, V: less than 0.010%, Nb: 0.010% to 0.060%, Ti: 0.005% to 0.020%, Al: 0.040% or less, Ca: 0.0010% to 0.0040%, N: 0.0030% to 0.0060%, and the balance being Fe and unavoidable impurities.

Abstract: A stainless clad steel includes a stainless steel having Pitting Index of 35 or more as a cladding material, wherein the ratio of Cr concentration/Fe concentration in a passivation film portion of the above-described cladding material to Cr concentration/Fe concentration in a parent phase portion of the above-described cladding material is 1.20 or more and, in addition, the amount of precipitation of a ? (sigma) phase of the surface of the above-described cladding material is 2.0% or less on an area ratio basis.

Abstract: A cladding material for stainless steel clad steel plate, includes, by mass %, 0.03% or less carbon, 1.5% or less silicon, 2.0% or less manganese, 0.04% or less phosphorus, 0.03% or less sulfur, 22.0% to 25.0% nickel, 21.0% to 25.0% chromium, 2.0% to 5.0% molybdenum, 0.15% to 0.25% nitrogen, and the balance being iron and incidental impurities, wherein critical pitting temperature (CPT) after normalization as determined in accordance with ASTM G48-03 Method E is 45° C. or higher, and corrosion loss at a welded zone as determined by a corrosion test in accordance with NORSOK Standard M-601 is 1.0 g/m2 or less.

Abstract: A seawater-resistant stainless clad steel includes a cladding material made of stainless steel having a pitting index represented by Cr[mass %]+3.3Mo[mass %]+16N[mass %], of 35.0 or more and a microstructure in a surface portion thereof including, by area ratio, less than 2.0% of a ? phase, wherein dynamic friction coefficients in the rolling direction and in a direction at a right angle to the rolling direction determined in accordance with JIS K 7125 are both 0.05 or less.

Abstract: A base metal for high-toughness clad plate having excellent toughness at a welded joint contains, in terms of mass %, C: 0.030 to 0.10%, Si: 0.10 to 0.30%, Mn: 1.00 to 1.60%, P: 0.015% or less, S: 0.003% or less, V: less than 0.010%, and at least one selected from Mo: 0.05 to 0.50%, Nb: 0.010 to 0.060%, Ti: 0.005 to 0.020%, Al: 0.040% or less, Ca: 0.0010 to 0.0040%, and N: 0.0030 to 0.0060%, the balance being Fe and unavoidable impurities, in which a percent ductile fracture is 85% or more in a ?20° C. DWTT test and vE?20° C. is 100 J or more at a HAZ 3 mm position.