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http://www.czub.cz/Kontakt.aspx?lang=en ... 22-contact
Barrel Specs.
http://www.czub.cz/en/catalog/293-other ... lavni.aspx
*NB: As below, why is Steyr mentioned ? ie: reading between the lines...could it be CZ now has the 'Forging Machine' from Steyr ??... CZ explains their forging machines are "based" on the GFM technique, so in a manner of speaking, they use the same technology & processes
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"COLD FORGING of RIFLE BARRELS
Forging Machine
Our hammer forging process is based on the GFM machines. These machines are known as radial forgers because the hammers move in linear, radial lines as shown in Figure 1. This forging technology was developed in Germany prior to World War II and continued after the war by GFM of Steyr, Austria *.
Material of barrel
For cold forging of rifle barrels it is recommended to use a highly pure material. In order to achieve a material of such a pure degree it is normally re-melted once or twice in an electric furnace and then vacuum degassed. Impurities in steel have a negative influence on the deformation characteristics during cold forging.
Common barrel materials:
32 Cr Mo V 1210
21 Cr Mo V 511
42 Cr Mo 4
14 Ni Cr 14
50 Cr V 4
Heat treatment
The material strength of the barrel blank lies between 750 and 1050 N/mm2.
After cold forging normally the strength of the barrel material increases by approximately 10%
After forging the barrel should again be stress relieved to make sure that during further processing no stress can be released which would negatively influence shooting accuracy.
An addition heat treatment (quenching) according special costumer demand is possible."
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