<p>Duplex stainless steel has attracted much attention because of its unique ferrite and austenitic duplex structure, but during thermal processing process, its thermoplasticity was poor due to the incongruence of the two phases. In response to this problem, this article is committed to the development of new energy-saving duplex stainless steel. We aimed to solve the problem of poor thermoplasticity by replacing Cr with Al and Ni with Mn. This study adopted thermally simulated high-temperature compression, high-temperature tensile experiments, and hot-rolling annealing experiments to observe the tissue changes of experimental steel under different processing conditions, and verified the close connection between thermoplastic control and component design, hot-rolling process, and tissue synergistic evolution. The experimental results show that in thermal simulation compression and tensile experiments, the experimental steel has better thermoplasticity at all deformation temperatures. In the hot-rolling experiment, there was no obvious edge cracking phenomenon in the experimental steel within the set temperature range, the microstructures are mainly ferrite, and the austenite content was low. The subsequent annealing treatment promotes the precipitation of the austenite phase, but the distribution uniformity of the austenite phase still needs to be further optimized. Nevertheless, this study has preliminarily proved that through fine composition design and reasonable hot-rolling process, the thermoplasticity of experimental steel can be effectively controlled, laying a solid foundation for achieving ideal biphasic balance and performance optimization.</p>