Martensitic stainless steel

Martensitic steels - heat treatment

Supplied in most cases in the softened condition of delivery, in order to utilize their mechanical properties, a heat treatment consisting of hardening and tempering should be carried out. At a high temperature of about 1000-1100 ℃, the austenite is susceptible to hardening after cooling in the air so that the structure of the material is transformed into a martensite structure, where the next step is tempering. These steels have a strength of up to 1100 Mpa.

Hardening is carried out in the temperature range of 900-1100 ℃, tempering in the range of 200-800 ℃ depending on the grade. In relation to high-chromium steels, stainless martensitic steels do not exhibit relatively higher corrosion resistance, and the example is popular 4H13 steel.

Stainless martensitic bars and sheets - use

Martensitic stainless steels also belong to the group of magnetic steels, are not suitable for welding, and have limited ability to stamping or cold bending. They are used for the construction of easily replaceable non-weldable components as: steels for kracking equipment and pipes in the oil industry, steels for the manufacture of shafts for pumps, bolts, steels for the nitriding equipment, household items, steels for turbine and steam turbines, cutting tools, permanent for the rectification columns, constant for the valves of the engines and elements of the hydraulic presses, chokes, steels for molds for pressure casting, steels for working in the sea and water atmosphere (eg. H17N2), steels for making knives as well as steels for manufacture of rolling bearings.