STAINLESS CAST STEEL HAVING SUPERIOR RESISTANCE TO CAVITATION EROSION AND CORROSION BY SEAWATER

摘要

PURPOSE:To obtain the titled stainless cast steel having high castability and weldability by specifying the metallic structure of a steel contg. specified percentages of C, Si, Mn, Ni, Cr, Mo and Co. CONSTITUTION:A stainless cast steel consisting of, by weight, 0.05-0.1% C, 0.1-1.5% Si, 0.4-5% Mn, 0.5-4.5% Ni, 15-18.5% Cr, 2-4% Mo, 3.5-7% Co and the balance essentially Fe and satisfying 18-24 Ni equiv. (Ni%+0.65Cr%+ 0.98Mo%+1.05Mn%+0.35Si%+12.6C%) and an equation Cr%+3.3Mo%=21.6- 29% is manufactured. The steel has a structure consisting of 0.5-30% ferrite phase, =40% martensite phase and the balance austenite phase or epsilon-phase. The steel has superior resistance to cavitation erosion and corrosion by seawater and is suitable for use as a material for the impeller of a seawater pump.