If warm bending of high hardness armor sheets are bended ,can some body tell how much time plates should be heated before warm bending?

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Oleg Nizhnik

If heat treatment is done after bending, then the bending is usually done at 70% of melting point (900 C for low-alloy steels). Variation from 800C to 1150C are not uncommon though.

Shivraj SINGH Kasana

As a matter of fact bending is to be done after heat treatment when these sheets have about 650BHN hardness, please suggest some method.I am trying to do bending of sheets to 90 degree after heating to 180 deg. C , in multiple passes