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Which of the following is the best remedy for the Knife-Line attack?(a) Heating the welded stabilized steel in the range of 950°F to 1400°F(b) Heating the welded stabilized steel in the range of 1400°F to 1900°F(c) Heating the welded stabilized steel to 1950°F(d) Heating the welded stabilized steel in the range of 1950°F to 2500°FThis question was addressed to me in a national level competition.I'm obligated to ask this question of Eight Forms in portion Eight Forms of Corrosion of Corrosion Engineering

Answer»

The correct choice is (c) Heating the welded STABILIZED STEEL to 1950°F

The best I can explain: The temperature RANGE of 950°F to 1400°F is the sensitizing zone where only chromium carbide precipitates. Heating the welded stabilized steel to 1950^0F results in the dissolution of chromium carbide and precipitation of columbium carbide.



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