Corrosion Resistance of New Type 310MoCu Stainless Clad Steel for Coal Fired Smokestacks

概要

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Corrosion resistance of the newly developed stainless steel, type 310MoCu, was estimated under the various conditions for the coal fired power plant application with a single-loop desulfurization equipment, comparing with other stainless steels and Ni-base alloys. It was found that the corrosion resistance index, Isc (=-0.6(%Cr)+(%Ni)+1.5(%Mo)+7.5(%Cu)+122(%N)), of over 40 and addition of Cu were desirable against general corrosion under the sulfuric acid conditions. Corrosion resistance of clad plates of the new type steel was also investigated, taking processing factors into account. It was found that accelerated cooling after clad plate rolling, with cooling rate over 0.4K/s, greatly improved corrosion resistance, due to refinement of intermetallic phase along grain boundaries. Trial products of the new type stainless clad steels showed sufficient corrosion resistance including their welds.
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