Abstract: A cooling duct piston (1) for combustion engines. The cooling duct piston has a piston basic body (2) that is connected to a lining part (3), which is facing an assigned combustion chamber. Here, the lining part (3) completely forms the piston surface (4) of the cooling duct piston (1) that faces the combustion chamber. An encircling depression (5) is provided in the surface of the piston basic body (2) facing the combustion chamber. The lining part (3) provides a permanent connection at least with the surface of the piston basic body (2) facing the combustion chamber, and thus bridges the encircling depression (5), such that the encircling depression (5), with the lining part (3) that bridges it, forms a cooling duct (6).

Abstract: A semifinished product blank, suitable for the production of a steel piston (1) for internal combustion engines having cylinder crankcases made of light metal alloys. Such a steel piston (1) has at least one upper piston part (4) which has a combustion recess (2) and an annular wall (3), and a lower piston part (4?) which has a piston skirt (5) and a connecting rod bearing (6). The semifinished product blank is made of an austenitic steel, that is stabilized with Ni, Mn and N and that has a thermal expansion coefficient in a range of 16 to 21×10?6 K?1. Also disclosed is a steel piston, which at least has a piston skirt (5) made of an austenitic steel that is stabilzed with Ni, Mn, N. The piston skirt (5) has a thermal expansion coefficient in a range of 16 to 21×10?6 K?1.

Abstract: A cooling duct piston (1) for combustion engines. The cooling duct piston has a piston basic body (2) that is connected to a lining part (3), which is facing an assigned combustion chamber. Here, the lining part (3) completely forms the piston surface (4) of the cooling duct piston (1) that faces the combustion chamber. An encircling depression (5) is provided in the surface of the piston basic body (2) facing the combustion chamber. The lining part (3) provides a permanent connection at least with the surface of the piston basic body (2) facing the combustion chamber, and thus bridges the encircling depression (5), such that the encircling depression (5), with the lining part (3) that bridges it, forms a cooling duct (6).

Abstract: A semifinished product blank, suitable for the production of a steel piston (1) for internal combustion engines having cylinder crankcases made of light metal alloys. Such a steel piston (1) has at least one upper piston part (4) which has a combustion recess (2) and an annular wall (3), and a lower piston part (4?) which has a piston skirt (5) and a connecting rod bearing (6). The semifinished product blank is made of an austenitic steel, that is stabilized with Ni, Mn and N and that has a thermal expansion coefficient in a range of 16 to 21×10?6 K?1. Also disclosed is a steel piston, which at least has a piston skirt (5) made of an austenitic steel that is stabilzed with Ni, Mn, N. The piston skirt (5) has a thermal expansion coefficient in a range of 16 to 21×10?6 K?1.