Spring steel alloys are used for making all kinds of springs, shocks and other parts which require the elasticity, 
they can be divided into two basic groups:
a) silicon steels, manganese, silicon-manganese
b) chromium steels with the addition of vanadium, manganese and silicon
The first of these groups, steel thanks to alloy addition of silicon raises its string properties, and thanks to reduced amount of
carbon the elastic properties of steels increase. At higher temperatures, these steels decarburizate very easily and hardenability
of these materials is slightly better than the spring carbon steels. In the second group there are steels which, thanks to the
carbide former components of vanadium and chromium, have greater resistance to higher temperatures and their hardenability
is greater than silicon steels.

In the marking of grade according to PN in the first place is a digit representing the average carbon content in hundredths of %,
then there is a letter or more indicating the symbol of the alloying component , if the digit comes after the letter it tags the
amount of this element, if the number does not occur at all, this means that the amount of certain component is less than 2%.
G - Manganese
S - Silicon
H - Chrome
F - Vanadium

In the marking of grade according to PN in the first place is a digit representing the average carbon content in hundredths of %,
then there is a letter or more indicating the symbol of the alloying component , if the digit comes after the letter it tags the
amount of this element, if the number does not occur at all, this means that the amount of certain component is less than 2%.
Huta Marta Katowice 1913
65G - manganese steel
55S2 - silicon steel
60S2/60S2A - silicon steel
50HS - chrome-silicon
50HF - chrome-vanadium steel
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