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Mechanical Properties of TRIP Steels for Room Temperature Use Tatsu FUJITA, Hirosi MISAWA, and Hironori Tsursumi Synopsis: TRIP steels(Transformation Induced Plastity) recently developed by V. F. ZACHAY, et al., have aroused a considerable interest because of a good combination of high strength, high ductility and high fracture toughness. This investigation is concerned with mechanical properties of TRIP steels for room temperature use having compositions of 0.25%C-2%Si-2%Mn-8%Cr-4%Mo as a base and its modifications. The results are as follows: (1) The steel with the basic composition is found to be excellent in the combination of strength, ductility and toughness and in corrosion resistance but to be inferior in delayed failure and notch fatigue properties. (2) In relations between processing and mechanical properties, cold working is more effective than subzero treatment to increase strength without losing ductility. (3) A partial substitution of Cr for Ni and Mo in the basic composition results in a little improvement in mechanical properties. (4) The mechanical properties of TRIP steels are closely related to their MD points and it is useful to apply a Ni equivalent shown below in the estimation the relation between mechanical properties and alloying elements. Nieq=%Ni+0.65%Cr+0.98%Mo+1.05Mn+0.35%Si+1.26%C (Recevied Dec. 15, 1971)