New charcoal rocket stove

So, a few days ago i asked a question about a charcoal making rocket stove, but my materilals werent suffecient so i got another idea from a youtube video:
I was planning on making one of these as they seem epic, but the burn chaber cant be made of steel as it will corrode away pretty quickly, So i does anyone know a good castable that transfers heat well? (btw i dont have acsess to fireclay, unless bentonite can be used)

Maybe this:Rapid Set


Rapid Set® CEMENT ALL®
SECTION 1 – PRODUCT AND COMPANY INFORMATION


Supplier
CTS Cement Manufacturing Corp. 11065 Knott Ave., Suite A Cypress, CA 90630, United States Telephone Number: 800-929-3030 FAX Number: 714-379-8270 Email: info@ctscement.com Website: www.ctscement.com
Supplier Emergency Contact
1-714-379-8260
Product Name: Rapid Set Cement All CAS Number: N/A
Chemical Family: Cementitious Mortar
SECTION 2 – COMPONENT INFORMATION
Ingredient (Specific Chemical Identity, Common Name)

Calcium Sulfoaluminate 40-60%
Cement Silica Sand 40-60%
NSodium Sulfate 0-4%
Methanol 0-0.1%


Available at Home Depot, relatively cheap.

William Bronson wrote:Maybe this:Rapid Set


Rapid Set® CEMENT ALL®
SECTION 1 – PRODUCT AND COMPANY INFORMATION


Supplier
CTS Cement Manufacturing Corp. 11065 Knott Ave., Suite A Cypress, CA 90630, United States Telephone Number: 800-929-3030 FAX Number: 714-379-8270 Email: info@ctscement.com Website: www.ctscement.com
Supplier Emergency Contact
1-714-379-8260
Product Name: Rapid Set Cement All CAS Number: N/A
Chemical Family: Cementitious Mortar
SECTION 2 – COMPONENT INFORMATION
Ingredient (Specific Chemical Identity, Common Name)

Calcium Sulfoaluminate 40-60%
Cement Silica Sand 40-60%
NSodium Sulfate 0-4%
Methanol 0-0.1%


Available at Home Depot, relatively cheap.

Thank you, i will look for something like this in Denmark, but if there is none, do you know a homade castable?