Question

Peritectic reactions are applicable for carbon contents up to _________

(a) 0.1%

(b) 0.26%

(c) 0.55%

(d) 0.96%

The question was asked in examination.

My question is based upon Iron and Iron Carbide System topic in portion Constitution of Alloys and Phase Diagrams of Engineering Material & Metallurgy

Answer 1

Correct answer is (c) 0.55%

To elaborate: In a peritectic reaction, 0.53% C of liquid combines with 0.09% C of ferrite at 1495^oC. This results in the formation of ϒ austenite (0.17% of C). This reaction affects only solidification of steels with less than 0.55% carbon.