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Which of the following is the best remedy for the Knife-Line attack?

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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°F

This 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

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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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