Heating Element for Electrical Furnace

Probably OP is trying this for Refractory cement/concrete and he is referring to curing at different temperatures.. Just speculating...

Certainly not for ordinary Portland cement or concrete

I would think Kanathal A1 would be a better choice and have the most service life. How big is the furnace? If you contact these people http://duralite.com/ they can give you a ton of information on the best metal to use for a particular service, design and build most any element you might need. They designed and built the elements for my new electric glass furnace and annealing oven and did a great job. They are also very reasonable priced and most of the times offer design information and help for free if you let them know you serious about purchasing from them.

Thanks for your reply but my question is not solve in this way !

I have both Kanthal A1 Heating element and Nichrome Heating elements .

Lime powder is one part of cement and KanthalA1 heating element is magnetic & Nichrome 80/20 Heating element non magnetic.

want to know which Heating element will be suitable for make a Furnace for cement Cube Analise at temperature from ambient to 700 deg.

I understand your question and I think the engineers at duralite will be able to tell you which is best for the service or direct you to someone that can. I did contract maintenance on concrete block plants many years ago and I sometimes look over some projects at the two lime kilns at the mill I work at but I am not an expert by any means. Of course we see allot higher temps in the lime kilns but at the concrete block plant they used steam to cure the blocks after they made them. I am not sure but I remember the area in the drying ovens was really humid and this helped with the concrete cure. I think they a used saturated steam sparger to deliver the heat and make the moisture level in the oven high. If you also need a high moisture content curing environment it may not work very well with the electric elements. The mix with the gases from the concrete cure high humidity levels may cause a high corrosion rate on any element.