... carried out at free corrosion. The specimens were dimensioned by about 30 · 20 · 0.5^±0,01 mm³. Their ground surface had a roughness of R_a = 3.2 μm. The area of the entrance as well as that of the exit surface was 132.73 mm² in size and 13 mm in diameter...

... of the materials has a significant effect on the respective hydrogen subsurface concentration and the diffusion coefficient. hydrogen permeation supermartensitic stainless steel formation water realistic environments diffusion coefficient subsurface concentration free corrosion chemical composition...

... concentration free corrosion heat treatment chemical composition INTRODUCTION Supermartensitic stainless steels are intended to replace higher alloyed materials, not only as a flowline material in several recently explored North Sea oil and gas fields, but also in the topside equipment of the production...

... in the delivered and also in the quenched condition at free corrosion in the NACE TM 0177-96 standard solution saturated with H₂S up to various levels. As a result, it turned out that the diffusion coefficient in the quenched condition is by the factor five higher than in the state as delivered...

..., the sour service tolerance of two typical LC 13 % Cr steels with different nickel and molybdenum contents has been investigated at free corrosion by the slow strain rate test (SSRT), predominantly in the state as delivered. For basic informations on hardening effects by welding, also a simple quenching...