Cladding material for stainless-steel-clad steel plate and stainless-steel-clad steel plate obtained using same, and process for producing same

Abstract

The purpose of the present invention is to provide: a cladding material for stainless-steel-clad steels which retain both improved reliability of the health of the bonded interfaces and the performances of the base and the cladding material (corrosion resistance and mechanical properties) and which have excellent resistance to corrosion by seawater; a stainless-steel-clad steel obtained using the cladding material; and a process for producing the stainless-steel-clad steel. The cladding material for stainless-steel-clad steel plates is characterized in that the cladding material, after normalizing, contains, in terms of mass%, up to 0.03% of C, up to 1.5% of Si, up to 2.0% of Mn, up to 0.04% of P, up to 0.03% of S, 22.0-25.0% of Ni, 21.0-25.0% of Cr, 2.0-5.0% of Mo, and 0.15-0.25% of N, with the remainder comprising Fe and unavoidable impurities, has a critical pitting temperature (CPT), as provided for in ASTM, of 45 C or higher, and has a corrosion amount in the weld of the cladding material, as determined through a corrosion test provided for in the NORSOK standard, of 1.0 g / m2 or less. This cladding material is used to produce a stainless-steel-clad steel plate.

Description

technical field [0001] The present invention relates to a composite material of an austenitic stainless steel clad steel plate used in various applications represented by marine structures, shipbuilding, and seawater desalination equipment, a stainless steel clad steel plate using the composite material, and a manufacturing method thereof. Background technique [0002] In recent years, as demands for industrial equipment and structures, durability, long life, and maintenance-free have been aimed at, and stainless steel has attracted attention as a material meeting these demands. On the other hand, alloy elements represented by Ni, Mo, and Cr, which are main raw materials of stainless steel, have risen or fluctuated in price. Therefore, recently, stainless steel clad steel has attracted attention as a steel material that can replace solid (scale-free) stainless steel and can utilize the excellent corrosion resistance of stainless steel more economically, and is stable in pric...

AI Technical Summary

Problems solved by technology

However, in Patent Document 2, in order to ensure the corrosion resistance and seawater corrosion resistance required for various applications of stainless steel clad steel pipes (for example, marine structures, etc.), it is necessary to select the stainless steel used as the composite material according to each application.

In other words, only a method of adjustment using only the components of stainless steel is disclosed. In the case of stainless steel clad steel, it is difficult to improve the reliability of the integrity (jointness) of the joint interface while maintaining the balance between the base material and the composite material. Performance (corrosion resistance and mechanical properties)

In addition, it is more difficult to deal with all high-grade steels and multiple varieties

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