What is the %wt and temp for delta ferrite

What is the %wt and temp for delta ferrite

• A. 0.1 % wt and 1493 C
• B. 0.01 % wt and 1000 C
• C. 0.5 % wt and 900 C
• D. 0.2 % wt and 800 C

Answer: (A)

Delta ferrite is the high-temperature ferritic phase that forms in stainless steel welds during solidification. Its carbon content is very low, around 0.1 wt%, and it remains stable up to about 1493 C before transforming to other phases as it cools. The other options pair implausibly low temperatures with higher carbon contents or temperatures well below the solidification range where delta ferrite exists, so they don’t reflect the typical delta ferrite condition. Therefore, the best match is 0.1 wt% carbon and about 1493 C.

Delta ferrite is the high-temperature ferritic phase that forms in stainless steel welds during solidification. Its carbon content is very low, around 0.1 wt%, and it remains stable up to about 1493 C before transforming to other phases as it cools. The other options pair implausibly low temperatures with higher carbon contents or temperatures well below the solidification range where delta ferrite exists, so they don’t reflect the typical delta ferrite condition. Therefore, the best match is 0.1 wt% carbon and about 1493 C.