Method for increasing the yield point in hollow bodies from steel alloys, to which anincrease in the yield point cannot be imparted by heat treatment, particularly in hollow bodies from austenitic steel alloys

摘要

292,937. K.rupp Akt.-Ges., F. June 23, 1927, [Convention date]. Drawings to Specification. Hoops and rings.-In the manufacture of an article such as a protection cap for the windings of a turbo rotor, steel alloys, whose yield point cannot be increased by heat treatment, e.g. an austenitic nickel-manganese steel, are hot worked by rolling, forging, &c. to hollow form and machined to form an over-sized body which is then expanded, as by a mandrel, to induce a stress in excess of the original yield point. The body is finally machined. Specification 154,555, [Class 83 (iv), Metals, Working], is referred to.