High alloy heat resistance steels based on 12% Cr content are characterized by specific structure and properties, which can substantially complicate technological procedure of their forming. These 12 % Cr based steel are characterized by increased resistance to deformation that affects-their formability significantly, quit narrow interval of forging temperatures, non-uniform formability and high sensitivity to stresses. Paper deals briefly with effect of various factors on formability, microstructure and mechanical properties. Effect of some chemical elements, grain size and volume of delta ferrite is discussed and compared. Effect of forming temperature is also discussed.Keywords: Heat resistance steel, forging temperature, structure
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