When I run a particular Caesar II model, I am getting ''Error no 60E'' and it
saying the temp is outside the allowed range for these material, where I
have used material (393)B423 N08825 for design temp 212 deg.(F)

But ASME B31.3-2004 shown the allowable stress 22.3 ksi for metal temp
1000 deg.(F), it means we can use up to 1000 deg(F).

In this case why the above indicated error coming ? How to solve it?

If you'll check this entry in the material database you'll find that the lowest expansion coefficient is for 70 degF. So if you have any temperatures below 70 (including ambient) that would explain the message.

The reason for this is that the Code doesn't offer expansion coefficients at low temperatures for this material.

In this case how i perform the analysis with Caesar?

Ask your "Materials Expert" for the data, or alternatively ask your pipe supplier. We (COADE) don't have this data.