STEEL Russian patent published in 2018 - IPC C22C38/00 C22C38/54 

FIELD: metallurgy.

SUBSTANCE: invention relates to steels, which are used for the manufacturing of parts of furnaces, thermal generating units, pipes. Steel contains 0.1–0.2 wt% of carbon, 0.5–1.0 wt% of silicon, 0.8–1.2 wt% of manganese, 20.0–24.0 wt% of chromium, 0.4–0.6 wt% of copper, 0.15–0.25 wt% of vanadium, 0.2–0.4 wt% of niobium, 0.005–0.01 wt% of calcium, 0.03–0.05 wt% of boron, 0.15–0.25 wt% of aluminum, 0.2–0.4 wt% of cobalt, 0.3–0.4 wt% of hafnium, the rest being iron.

EFFECT: improved heat resistance of steel is ensured.

1 cl, 1 tbl