High-alloy steel for work at higher temperatures is a group of special steel which are used for making of blades turbine, 
steam turbine blade forgings, and other power equipment operating at the temperatures up to 600 o C. The main alloying
addition in this group of steels is chromium which content, in this type of steel, is from 10 to 12.5% ​​in weight.

Symbol of steel grade according to the PN is in order: digit at the beginning refers to an average carbon
content in hundredths of %, followed by letters denoting
H - Chrome
M - Molybdenum
F - Vanadium
N - Nickel
W - Tungsten
If the digit appears after the letters, it means the average content of a certain component in %.
For example, 23H12MNF grade means steel with an average content of carbon 0,23 %,the average chromium content of 12%,
and that the composition contains the addition of molybdenum, nickel and vanadium.

15H11MF - chrome-molybdenum-vanadium
15H12WMF - stainless chromium-tungsten-molybdenum-vanadium
20H12M1F - chrome-molybdenum-vanadium
23H12MNF - chrome-molybdenum-nickel-vanadium

high temperature alloy steel corrosion resisting steel heat resisting steel and high temperature acid resisting steel (stainless steel, Inox)

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