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Basis for the application of the TM-steel Alform 700 ML was the requirement to achieve the same performance for the steel lining as for the materials applied in earlier projects e.g. the Limberg II PSP-project. The requirements for the base material, the manufacturing and welding were the same as for the earlier project. Based on data-bases of investigations on the quenched and tempered steels, that were done for earlier projects it was decided, to add the complementary investigations for the material of interest. On the basis of successful execution of earlier projects the aim was, to use the well-known standard procedures and to prove, whether the proposed material was suitable to replace the standardized high-strength quenched and tempered steel S690QL - designation according to EN 10025-6. Whereas the steel S690QL is covered by European standards and was successfully used for a long time. For the high-strength thermomechanically rolled fine-grain steel S700ML (in accordance/similar to EN 10025-4) so far no reference existed for application in pressure shaft linings and also the standardization is in progress. However it was well known, that these grades are wide spread in industry due to the excellent weldability and high toughness. Compared to the water-quenched and tempered high-strength grades, used so far, the micro-alloying concept in combination with the rolling and cooling process (TMCP = Thermo-mechanical Controlled Processed) the advantages of the TM-grades were proposed as high strength combined with high toughness, excellent weldability, best formability and high resistance against cold cracking.