Provided is a nickel-base alloy-clad steel plate that is a clad steel plate including a cladding metal composed of a nickel-base alloy such as Alloy825 or Alloy625, the clad steel plate including a base metal containing a large amount of Nb and stably having a DWTT property (i.e., the capability of stopping the propagation of brittle fracture) of 85% or more in terms of shear fracture percentage at a test temperature of -25°C, the clad steel plate having excellent corrosion resistance and an excellent bonding property. Also provided is a method for producing the nickel-base alloy-clad steel plate.
The nickel-base alloy-clad steel plate includes a cladding metal composed of a nickel-base alloy and a base metal composed of low-alloy steel having a specific composition. The base metal includes a bainite microstructure having an average grain size of 30 µm or less and has an excellent DWTT property.