Abstract
AbstractNew designs of power plants require high pressure and high temperature steam parameters in order to reach higher efficiencies and minimise harmful emissions. This evolution has necessitated development of new families of ferritic steels that combine improved creep rupture strength values with a good oxidation resistance in steam at high temperatures. Recently, Vallourec and Mannesmann Tubes started to develop of a new 12%Cr steel, called VM12, which is aimed at tubes and pipes operating at steam temperatures of up to 650°C. Manufacturing of this grade of steel has been proved by production of several heats and rolling of tubes and pipes in several dimensions and with different rolling processes. In conjunction with investigation of the base metal properties – including creep tests and high temperature oxidation behaviour – welding, cold bending and hot induction bending qualifications also took place. The present paper summarises the results of the investigations and presents the first findings fo...
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