Steel for work at higher temperatures is a group of steels commonly called the boiler steel, which can be used at temperatures 
below 600 o C. Their main usage is for part of the machinery and equipment used in power engineering such as: fittings for
boilers and turbines, pressure vessels for chemical and power industry, steam, water and gas turbines, and everywhere where
high temperatures resistance is required.
The main alloy additions to these steels are:
-Chrome, which increases the resistance to oxidation
-Molybdenum, whose presence increases the creep strength of steel.

Symbol of steel grade according to the PN is as follows: digit at the beginning refers to the average content of carbon in
hundredths of a%, followed by letters denoting
H - Chrome
G - Manganese
M - Molybdenum
F - Vanadium

If the digit appears after the letters, it means the average content of a certain component in%.
For example, 26H2MF grade refers to steel with an average carbon content of 0.26%,
the average chromium content of 2%, and that the steel contains some addition of molybdenum and vanadium
Huta Królewska rok 1930
15HM - chrome-molybdenum
20HM ( 25HM ) - chrome-molybdenum
10H2M -chrome-molybdenum
13HMF - chrome-molybdenum-vanadium
21HMF - chrome-molybdenum-vanadium
26H2MF - chrome-molybdenum-vanadium
30H2MF - chrome-molybdenum-vanadium
34HN3M - stainless chromium-nickel-molybdenum

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