ICONE11-36613 BEHAVIOR OF STEELS IN FLOWING LIQUID PB/BI AT 420-600℃ AFTER 4000-7200 H

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Corrosion tests were carried out on austenitic AISI 316L and 1.4970 steel and on martensitic MANET 10Cr steel in flowing (up to 1.3 m/s) Pb/Bi. The concentration of oxygen in the liquid alloy was controlled at (10)^<-6> wt%. Specimens consisted of tube and rod sections in original state and after alloying of Al into the surface. Martensitic steels develop thick protective magnetite and spinel layers that spall off and grow again during long term exposure (7200 h). At 600℃ the oxide scale changes to thin protective spinel layers with partial dissolution attack at some spots. Austenitic steels exhibit thin spinel layers at 420℃ and thick spinel and magnetite layers at 550℃ which are protective. The spinel layer is also replaced after it brakes off. Severe attack of the liquid alloy occurs on austenite at 600℃ already in the 2000 h exposure period. Steels with 8 - 15 wt% Al alloyed into the surface suffer no corrosion attack at all experimental temperatures and exposure times.
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