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A steam turbine including a rotor rotatable about an axis and a casing concentrically surrounding the rotor. A reduction in the starting times and reduced production costs may be achieved in that the casing includes a high-mass hollow-cylindrical basic carrier and a plurality of shells concentricall

A steam turbine including a rotor rotatable about an axis and a casing concentrically surrounding the rotor. A reduction in the starting times and reduced production costs may be achieved in that the casing includes a high-mass hollow-cylindrical basic carrier and a plurality of shells concentrically surrounding the basic carrier. The shells are each produced from a bent metal sheet and interspaces capable of being filled with steam are defined between adjacent ones of the plurality of shells.

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What is claimed is: 1. A steam turbine comprising: a rotor rotatable about an axis; and a casing concentrically surrounding the rotor, wherein the casing includes a high-mass hollow cylindrical basic carrier and a plurality of shells concentrically surrounding the basic carrier, interspaces capable

What is claimed is: 1. A steam turbine comprising: a rotor rotatable about an axis; and a casing concentrically surrounding the rotor, wherein the casing includes a high-mass hollow cylindrical basic carrier and a plurality of shells concentrically surrounding the basic carrier, interspaces capable of being filled with steam being defined between adjacent ones of the plurality of shells, wherein each of the shells includes a bent metal sheet. 2. The steam turbine as recited in claim 1, wherein the basic carrier includes a plurality of annular carrier segments disposed adjacent to one another in an axial direction and connected to one another, wherein the plurality of shells are barrel-shaped so that each next outer shell of the plurality of shells surrounds the further inward-lying shells both in a radial and in the axial direction, and wherein each shell is connected on an end face of the shell in a steamtight manner to a respective one of the plurality of carrier segments. 3. The steam turbine as recited in claim 2, wherein the steam turbine defines a horizontal plane dividing the basic carrier into an upper part including upper carrier segment halves and a lower part including lower carrier segment halves and dividing the plurality of shells into upper shells and a lower shells, and wherein the upper and lower part are connected to each other, each upper segment half is connected to a respective lower segment half, and each upper shell is connected to a respective lower shell via a respective flanged screw connection. 4. The steam turbine as recited in claim 3, wherein each flanged screw connection includes a horizontal flange attached to at least one of a respective upper shell and a respective lower shell. 5. The steam turbine as recited in claim 4, wherein the horizontal flange is attached by welding. 6. The steam turbine as recited in claim 3, wherein each upper shell is screwed at a screw connection to a respective upper segment half, and each lower shell is welded to a respective lower segment half. 7. The steam turbine as recited in claim 6, wherein the screw connection includes a semiannular flanged connection. 8. The steam turbine as recited in claim 2, wherein the carrier segments are connected to one another so as to allow steam to flow out of an interior of the basic carrier into the interspaces. 9. The steam turbine as recited in claim 1, further comprising an inlet pipe configured to provide the steam for operating the steam turbine to the rotor from outside the casing through each of the shells, and a plurality of piston ring seals, each sealing off the inlet pipe as it passes through the respective shell. 10. The steam turbine as recited in claim 1, wherein the casing includes at least one of an inner casing and a combined inner and outer casing, wherein a steam duct is defined between the basic carrier and the rotor, and further comprising a blading disposed in the steam duct, the blading including moving blades and guide vanes, the guide vanes being connected to an inner wall of the basic carrier. 11. The steam turbine as recited in claim 10, wherein the basic carrier includes a plurality of annular carrier segments disposed adjacent to one another in an axial direction and connected to one another, and further comprising a plurality of successive stages disposed within each carrier segment. 12. The steam turbine as recited in claim 11, wherein the plurality of successive stages includes three stages disposed within each carrier segment. 13. The steam turbine as recited in claim 10, wherein the casing is one of a single-flow casing and a double-flow casing. 14. The steam turbine as recited in claim 1, wherein the casing includes an outer casing. 15. The steam turbine as recited in claim 1, wherein the bent metal sheet includes at least a portion of a standard metal sheet including a high-temperature nickel-based alloy and a sheet thickness of several millimeters. 16. The steam turbine as recited in claim 15, wherein the high-temperature nickel-based alloy includes Alloy 617. 17. The steam turbine as recited in claim 15, wherein the sheet thickness is between 3 and 11 millimeters. 18. The steam turbine as recited in claim 15, wherein the sheet thickness of each shell depends upon a position of the shell within the casing. 19. A method for producing a steam turbine as recited in claim 1, the method comprising: forming each of the plurality of shells by performing a free plastic bending of a straight metal sheet. 20. The method as recited in claim 19, wherein the straight metal sheet includes a standard metal sheet having a high-temperature nickel-based alloy.