High-pressure steel cylinders (HPSC) are commonly used for a variety of applications like industrial gases storage and its transport, storage and transport of compressed natural gas (CNG) and many others. Especially in case of CNG storage, variety of gas purities is used worldwide. Special field of gases storage is storage and transportation of untreated CNG so called raw gas, meaning not dehumidified and desulphurized natural gas. This kind of gas causes significantly increased speed of corrosion in H2S environment. So far, there were only two solutions.First one was to use HPSC with very low mechanical properties, limited of tensile strength (TS) up to 950 MPa to withstand such conditions. This caused the increased weight of cylinders due to the increased wall thickness caused by the low mechanical properties of material. Second solution was for use of inner coatings of HPSC, but this solution is highly expensive and the wear processes during the gas filling caused the wear of the inner coating and its chipping. The best solution is to use a different material. In this case, the high strength martensitic stainless steel was only alternative solution to get an increased corrosion resistance and also TS up to 1099 MPa. In this paper, the basic microstructure, mechanical properties and resistance to SSC are evaluated and compared with the steel 34CrMo4, which is used as the standard material for HPSC production.Keywords: Martensitic stainless steel, high-pressure steel cylinders, microstructure, mechanical properties, sulphide stress cracking
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