Medium and low pressure blades of 155 for turbine with subcritical grade of 300mw

The utility model discloses medium and low pressure blades of 155 for a turbine with a subcritical grade of 300mw. A blade consists of a blade root, a blade shape and a surrounding tape, wherein the blade root is positioned by T-typed and double-T-typed blade roots, the blade shape is of an arched blade shape, and the surrounding tape is of an integral surrounding tape shape; the periphery of the arched blade shape is bended along an arched shape; the width of the blade shape of a low pressure blade is 31-51mm, and the width of the blade shape of a medium pressure blade is 33-54mm; and the length C of the steam duct of the low pressure blade is 111-183mm, and the length C of the medium pressure blade is 120-256mm. According to the arched blade shape designed by applying the principle of plastic-resistance performance deformation, the periphery of the blade shape is bended along the arched shape, a flow field is further optimized, the plastic deformation is reduced, and the probability of losing efficacy of ea